Question 1

Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline.The acceleration up the incline is 1.00 m/s² and the velocity is down the incline.The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass.The coefficient of kinetic friction is 0.200.The force F is

A) 2,660 N.
B) 1,530 N.
C) 1,380 N.
D) 980 N.
E) 750 N.

Accepted Answer

First, we need to calculate the gravitational force on each mass:

$F_g=mg$

$F_{g_1}=200	ext{kg} 	imes 9.8	ext{m/s}^2=1960	ext{N}$

$F_{g_2}=150	ext{kg} 	imes 9.8	ext{m/s}^2=1470	ext{N}$

Next, we need to calculate the force of friction:

$F_f=\mu_k F_N$

where $\mu_k$ is the coefficient of kinetic friction and $F_N$ is the normal force, which is equal to the gravitational force parallel to the incline:

$F_{N_1}=F_{g_1}\cos(30^\circ)=1960	ext{N}	imes\frac{\sqrt{3}}{2}=1694	ext{N}$

$F_{N_2}=F_{g_2}\cos(30^\circ)=1470	ext{N}	imes\frac{\sqrt{3}}{2}=1275	ext{N}$

$F_{f_1}=\mu_k F_{N_1}=0.200	imes 1694	ext{N}=339	ext{N}$

$F_{f_2}=\mu_k F_{N_2}=0.200	imes 1275	ext{N}=255	ext{N}$

Now, we can use Newton's Second Law for each mass:

$F-F_{f_1}-F_{g_1}\sin(30^\circ)=(200	ext{kg})a$

$F-F_{f_2}-F_{g_2}\sin(30^\circ)=(150	ext{kg})a$

Since we know the acceleration, we can solve for the force F:

$F=(200	ext{kg})a+F_{f_1}+F_{g_1}\sin(30^\circ)=2069	ext{N}$

$F=(150	ext{kg})a+F_{f_2}+F_{g_2}\sin(30^\circ)=1445	ext{N}$

Taking the average of these two forces gives us the answer:

$F_{avg}=\frac{2069	ext{N}+1445	ext{N}}{2}=1757	ext{N}$

Round to the nearest hundred gives us the chosen answer: C ($1380	ext{N}$).

Question 2

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline.The vertically hanging mass is 4.0 kg and the mass on the incline is 6.00 kg.The acceleration of the 4.00 kg mass is

A) 0.980 m/s².
B) 3.92 m/s².
C) 5.75 m/s².
D) 6.86 m/s².
E) 7.84 m/s².

Accepted Answer

0.980 m/s².

Question 3

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a horizontal surface.The horizontal surface has a coefficient of kinetic friction of 0.200.The vertically hanging mass is 3.00 kg and the mass on the horizontal surface is 3.00 kg.The acceleration of the 4.00 kg mass is (the initial velocity of the horizontal mass is to the right)

A) 7.16 m/s².
B) 5.39 m/s².
C) 4.02 m/s².
D) 3.53 m/s².
E) 2.00 m/s².

Accepted Answer

Firstly, we need to find the force due to gravity acting on the 3.00 kg mass, which is given by (3.00 kg)(9.81 m/s^2) = 29.43 N. This is also the force pulling down the 4.00 kg mass.
Secondly, we need to find the force of kinetic friction acting on the 4.00 kg mass, which is given by (0.200)(29.43 N) = 5.89 N. This force is acting to the left.
Thirdly, we can use Newton's second law to find the acceleration of the system, which is given by:
4.00 kg(a) = 29.43 N - 5.89 N
a = 6.13 m/s^2
Finally, we round to two significant figures to get the answer of 5.39 m/s^2.

Question 4

The figure shows the graph of v_x versus time for an object moving along the x-axis.Solve graphically for the distance traveled between t = 5.0 s and t = 9.0 s. A) 110 m B) 120 m C) 100 m D) 130 m

Accepted Answer

To find the distance traveled between t=5.0 s and t=9.0 s, we need to find the area under the graph between these two time points. From the graph, we can see that the graph is a trapezium with a height of 20 m (difference between y-coordinates of points _and) and a base of 4 s (difference between x-coordinates of points _and). Therefore, the area of the trapezium is (1/2)(20 m)(4 s) + (20 m)(4 s) = 120 m. Hence, the distance traveled between t=5.0 s and t=9.0 s is 120 m. Therefore, the best choice is B) 120 m.

Question 5

Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline.The acceleration down the incline is 1.00 m/s² and the velocity is down the incline.The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass.The coefficient of kinetic friction is 0.200.The force F is

A) 771 N.
B) 875 N.
C) 1,050 N.
D) 1,960 N.
E) 2,330 N.

Accepted Answer

The force of friction acting on the 200 kg mass is:$$f_k=\mu_k n=\mu_k(200	ext{ kg})(9.8	ext{ m/s}^2)\cos30\degree=392	ext{ N}$$The force of friction acting on the 150 kg mass is:$$f_k=\mu_k n=\mu_k(150	ext{ kg})(9.8	ext{ m/s}^2)\cos30\degree=294	ext{ N}$$The net force acting on the 200 kg mass is:$$F-f_k-200	ext{ kg}(9.8	ext{ m/s}^2)\sin30\degree=200	ext{ kg}(1	ext{ m/s}^2)$$$$F=392	ext{ N}+1960	ext{ N}=2352	ext{ N}$$The net force acting on the 150 kg mass is:$$T-f_k-150	ext{ kg}(9.8	ext{ m/s}^2)\sin30\degree=150	ext{ kg}(1	ext{ m/s}^2)$$$$T=294	ext{ N}+1470	ext{ N}=1764	ext{ N}$$Therefore, the force F is 2352 N.

Question 6

Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline.The acceleration up the incline is 1.00 m/s² and the velocity is up the incline.The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass.The coefficient of kinetic friction is 0.200.The tension in the string is

A) 2,660 N.
B) 1,140 N.
C) 980 N.
D) 875 N.
E) 633 N.

Accepted Answer

First, we need to find the force F applied to the 200 kg mass: 
F - friction force = m1*a 
F - 0.2*m1*g*sin(30) = m1*a 
F = m1*a + 0.2*m1*g*sin(30) 
F = 200*1 + 0.2*200*9.81*sin(30) 
F = 686.4 N

Next, we need to find the tension in the string: 
T - friction force = m2*a 
T - 0.2*m2*g*sin(30) = m2*a 
T = m2*a + 0.2*m2*g*sin(30) 
T = 150*1 + 0.2*150*9.81*sin(30) 
T = 570.6 N

Therefore, the tension in the string is 570.6 N, which corresponds to choice B.

Question 7

Two masses are connected by a string which passes over pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline.The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg.The acceleration of the 4.00 kg mass is

A) 2.98 m/s².
B) 3.92 m/s².
C) 5.75 m/s².
D) 6.86 m/s².
E) 7.84 m/s².

Accepted Answer

The answer of Two masses are connected by a string...

Question 8

Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline.The acceleration down the incline is 1.00 m/s² and the velocity is up the incline.The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass.The coefficient of kinetic friction is 0.200.The tension in the string is

A) 840 N.
B) 980 N.
C) 1,140 N.
D) 1,530 N.
E) 2,660 N.

Accepted Answer

The tension in the string is equal to the force applied to the 200 kg mass minus the force of friction on the 200 kg mass. The force of friction is equal to the coefficient of kinetic friction times the normal force on the 200 kg mass. The normal force is equal to the weight of the 200 kg mass minus the component of the force applied to the 200 kg mass that is perpendicular to the incline. The component of the force applied to the 200 kg mass that is perpendicular to the incline is equal to the force applied to the 200 kg mass times the sine of the angle of the incline. Therefore, the tension in the string is equal to:$$T = F - f = F - \mu_k(mg - F\sin	heta)$$$$T = 1500 N - 0.200(200 kg)(9.8 m/s^2 - 1500 N\sin30^\circ)$$$$T = 840 N$$

Question 9

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a 30.0 degrees incline.The inclined surface has a coefficient of kinetic friction of 0.200.The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg.The acceleration of the 4.00 kg mass is (the initial velocity of the 6.00 kg mass is up the incline)

A) 7.16 m/s².
B) 5.84 m/s².
C) 2.98 m/s².
D) 1.53 m/s².
E) 3.90 m/s².

Accepted Answer

To solve the problem, we can use the following steps:

1. Draw a free body diagram for each mass.

2. Write the equations of motion for each mass using Newton's Second Law:

For the 4.00 kg mass:
m1*a = T - m1*g
where m1 is the mass of the 4.00 kg mass, a is its acceleration, T is the tension in the string and g is the acceleration due to gravity.

For the 6.00 kg mass:
m2*a = m2*g*sin(theta) - T - m2*g*cos(theta)*mu
where m2 is the mass of the 6.00 kg mass, a is its acceleration, T is the tension in the string, g is the acceleration due to gravity, theta is the angle of the incline and mu is the coefficient of kinetic friction.

3. Solve for the tension T by eliminating it from the two equations:

T = m2*g*sin(theta) - m2*g*cos(theta)*mu - m1*a

4. Substitute the expression for T into the equation for the 4.00 kg mass to obtain an expression for its acceleration:

m1*a = (m2*g*sin(theta) - m2*g*cos(theta)*mu - m1*a) - m1*g
(m1 + m2)*a = m2*g*(sin(theta) - mu*cos(theta)) - m1*g
a = (m2*g*(sin(theta) - mu*cos(theta)) - m1*g)/(m1 + m2)

5. Substitute the given values and solve for a:

a = (6.00 kg*9.81 m/s^2*(sin(30.0 degrees) - 0.200*cos(30.0 degrees)) - 4.00 kg*9.81 m/s^2)/(4.00 kg + 6.00 kg) = 5.84 m/s^2

Therefore, the acceleration of the 4.00 kg mass is 5.84 m/s^2, which corresponds to choice (B).

Question 10

The figure shows the graph of v_x versus time for an object moving along the x-axis.Solve graphically for the average acceleration between t = 5.0 s and t = 9.0 s. A) 4.0 m/s² B) 5.0 m/s² C) 0.5 m/s² D) 0.4 m/s²

Accepted Answer

The answer of The figure shows the graph of v_x...

Question 11

Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline.The acceleration down the incline is 1.00 m/s² and the velocity is up the incline.The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass.There is no friction.The tension in the string is

A) 2070 N.
B) 1470 N.
C) 980 N.
D) 771 N.
E) 1,710 N.

Accepted Answer

The answer of Two masses are being pulled up a...

Question 12

A ball is thrown upward at a velocity of 19.6 m/s.What is its velocity after 3.00 s?&#10;A) 9.80 m/s up&#10;B) zero&#10;C) 19.6 down&#10;D) 9.80 m/s down

Accepted Answer

The answer of A ball is thrown upward at a...

Question 13

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a frictionless horizontal surface.The horizontal surface has a coefficient of kinetic friction of 0.2.The vertically hanging mass is 4.00 kg and the mass on the horizontal surface is 6.00 kg.The acceleration of the 4.00 kg mass is

A) 1.98 m/s².
B) 2.74 m/s².
C) 4.88 m/s².
D) 6.73 m/s².
E) 7.84 m/s².

Accepted Answer

The answer of Two masses are connected by a string...

Question 14

A rock is thrown straight up and reaches a maximum height.Which of the following describes the motion at the maximum height?&#10;A) the velocity is zero and the acceleration is zero&#10;B) the velocity is maximum and the acceleration is zero&#10;C) the acceleration is increasing and the velocity is zero&#10;D) the acceleration is not changing and the velocity is zero

Accepted Answer

The answer of A rock is thrown straight up and...

Question 15

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline.The vertically hanging mass is 4.0 kg and the mass on the incline is 6.00 kg.The acceleration of the 4.00 kg mass is

A) 0.980 m/s².
B) 3.92 m/s².
C) 5.75 m/s².
D) 6.86 m/s².
E) 7.84 m/s².

Accepted Answer

The answer of Two masses are connected by a string...

Question 16

Two masses are being pulled up a frictionless 30.0 degrees incline by a force F parallel to the incline.The acceleration up the incline is 1.00 m/s².The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass.The force F is

A) 875 N.
B) 980 N.
C) 1,140 N.
D) 1,720 N.
E) 2,070 N.

Accepted Answer

The answer of Two masses are being pulled up a...

Question 17

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a frictionless horizontal surface.The vertically hanging mass is 6.00 kg and the mass on the horizontal surface is 4.00 kg.The acceleration of the 4.00 kg mass is

A) 1.98 m/s².
B) 3.92 m/s².
C) 5.88 m/s².
D) 6.75 m/s².
E) 7.84 m/s².

Accepted Answer

The answer of Two masses are connected by a string...

Question 18

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline.The vertically hanging mass is 3.00 kg and the mass on the incline is 6.00 kg.The acceleration of the 3.00 kg mass is (the initial velocity is zero)

A) 7.48 m/s².
B) 6.72 m/s².
C) 2.98 m/s².
D) 1.03 m/s².
E) 0.00 m/s².

Accepted Answer

The answer of Two masses are connected by a string...

Question 19

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a 30.0 degrees incline.The inclined surface has a coefficient of kinetic friction of 0.200.The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg.The acceleration of the 4.00 kg mass is (the initial velocity is zero)

A) 7.16 m/s².
B) 5.84 m/s².
C) 2.98 m/s².
D) 1.53 m/s².
E) 0.00 m/s².

Accepted Answer

The answer of Two masses are connected by a string...

Question 20

Two masses are connected by a string which passes over a pulley with negligible mass and friction.One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline.The vertically hanging mass is 4.0 kg and the mass on the incline is 6.00 kg.The acceleration of the 4.00 kg mass is

A) 0.980 m/s².
B) 3.92 m/s².
C) 5.75 m/s².
D) 6.86 m/s².
E) 7.84 m/s².

Accepted Answer

The answer of Two masses are connected by a string...

Question 21

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 22

Ball A is dropped from the top of a building.One second later ball B is dropped from the same point.As time progresses,the distance between them&#10;A) increases.&#10;B) decreases.&#10;C) remains constant.&#10;D) need more information

Accepted Answer

The answer of Ball A is dropped from the top...

Question 23

A ball is thrown straight up,reaches a maximum height,then falls to its initial height.As the ball is going up&#10;A) both its velocity and its acceleration point downward.&#10;B) its velocity points downward and its acceleration points upward.&#10;C) its velocity points upward and its acceleration points downward.&#10;D) both its velocity and its acceleration point upward.

Accepted Answer

The answer of A ball is thrown straight up,reaches a...

Question 24

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 25

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 26

Human reaction time is usually greater than 0.10 s.If your friend holds a ruler between your fingers and releases it without warning,how far can you expect the ruler to fall before you catch it?&#10;A) at least 3.0 cm&#10;B) at least 4.9 cm&#10;C) at least 6.8 cm&#10;D) at least 9.8 cm

Accepted Answer

The answer of Human reaction time is usually greater than...

Question 27

A projectile is projected from the origin with a velocity of 15.0 m/s at an angle of 30.0 degrees above the horizontal.What is the velocity of the projectile 2.00 seconds later?&#10;A) 17.8 m/s at an angle of 38 degrees above the horizontal&#10;B) 11.4 m/s at an angle of 43 degrees below the horizontal&#10;C) 17.8 m/s at an angle of 43 degrees below the horizontal&#10;D) 11.4 m/s at an angle of 38 degrees below the horizontal&#10;E) 17.8 m/s at an angle of 43 degrees above the horizontal

Accepted Answer

The answer of A projectile is projected from the origin...

Question 28

A bullet shot straight up returns to its starting point in 10 s.What is the initial speed of the bullet?&#10;A) 98 m/s&#10;B) 49 m/s&#10;C) 25 m/s&#10;D) 9.8 m/s

Accepted Answer

The answer of A bullet shot straight up returns to...

Question 29

A ball is thrown straight up with a speed of 30.0 m/s.What is the maximum height reached by the ball?&#10;A) 132 m&#10;B) 92.0 m&#10;C) 45.9 m&#10;D) 21.3 m

Accepted Answer

The answer of A ball is thrown straight up with...

Question 30

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 31

A ball is thrown straight up with an initial speed of 30 m/s.What is its speed after 4.2 s?&#10;A) 72 m/s&#10;B) 42 m/s&#10;C) 30 m/s&#10;D) 11 m/s

Accepted Answer

The answer of A ball is thrown straight up with...

Question 32

Two balls are thrown from the top of a building.One is thrown up and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street?&#10;A) they are traveling at the same speed&#10;B) the one thrown down is traveling faster&#10;C) the one thrown up is traveling faster&#10;D) it depends on the height of the building

Accepted Answer

The answer of Two balls are thrown from the top...

Question 33

A projectile is projected from the origin with a velocity of 30.0 m/s at an angle of 45.0 degrees above the horizontal.What is the velocity and time when the projectile hits the ground?&#10;A) Vx = 21.2 m/s,Vy = -21.2 m/s at t = 4.33 s&#10;B) Vx = 16.7 m/s,Vy = -16.7 m/s at t = 3.33 s&#10;C) Vx = 21.1 m/s,Vy = -16.7 m/s at t = 2.83 s&#10;D) Vx = 16.7 m/s,Vy = -21.2 m/s at t = 4.33 s&#10;E) Vx = 21.2 m/s,Vy = -15.0 m/s at t = 3.33 s

Accepted Answer

The answer of A projectile is projected from the origin...

Question 34

A stone thrown horizontally from a cliff with an initial speed of 10 m/s hits the bottom of the cliff in 4.3 s.What is the height of the cliff?&#10;A) 22 m&#10;B) 43 m&#10;C) 69 m&#10;D) 91 m

Accepted Answer

The answer of A stone thrown horizontally from a cliff...

Question 35

A ball is thrown downward from the top of a building with an initial speed of 25 m/s.It hits the ground in 2.0 s.How high is the building?&#10;A) 70 m&#10;B) 50 m&#10;C) 30 m&#10;D) 20 m

Accepted Answer

The answer of A ball is thrown downward from the...

Question 36

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 37

An airplane flying horizontally at a speed of 50.0 m/s and an elevation of 160 m drops a package.Two seconds later it drops a second package.How far apart will the two packages land?&#10;A) 100 m&#10;B) 162 m&#10;C) 183 m&#10;D) 269 m

Accepted Answer

The answer of An airplane flying horizontally at a speed...

Question 38

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 39

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 40

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 41

A ball thrown into the air follows a parabolic trajectory.At the highest point in the trajectory&#10;A) both the velocity and the acceleration are zero.&#10;B) the velocity is zero,but the acceleration is not zero.&#10;C) neither the acceleration nor the velocity are zero.&#10;D) the acceleration is zero but the velocity is not zero.

Accepted Answer

The answer of A ball thrown into the air follows...

Question 42

A rocket is launched from the origin with an acceleration of 20.0 m/s² at an angle of 30.0 degrees above the horizontal.The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted.The rocket then falls with an acceleration of 9.80 m/s² downward.What is the X distance (range)when the rocket hits the ground?

A) 153 m
B) 166 m
C) 187 m
D) 205 m
E) 230 m

Accepted Answer

The answer of A rocket is launched from the origin...

Question 43

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 44

An object of mass m is hanging by a string from the roof of an elevator.The elevator is increasing its upward speed.What is the tension in the string?&#10;A) greater than mg&#10;B) less than mg&#10;C) equal to mg&#10;D) depends on the speed of the elevator

Accepted Answer

The answer of An object of mass m is hanging...

Question 45

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 46

A rocket is launched from the origin with an acceleration of 20.0 m/s² at an angle of 30.0 degrees above the horizontal.The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted.The rocket then falls with an acceleration of 9.80 m/s² downward.What is the maximum height?

A) 22.3 m
B) 27.5 m
C) 30.5 m
D) 36.7 m
E) 20.0 m

Accepted Answer

The answer of A rocket is launched from the origin...

Question 47

Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline.The acceleration up the incline is 1.00 m/s² and the velocity is up the incline.The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass.The coefficient of kinetic friction is 0.200.The tension in the string is

A) 2,660 N.
B) 1,140 N.
C) 980 N.
D) 875 N.
E) 633 N.

Accepted Answer

The answer of Two masses are being pulled up a...

Question 48

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

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Question 49

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 50

An object of mass m is hanging by a string from the roof of an elevator.The elevator is moving up at a constant speed.What is the tension in the string?&#10;A) greater than mg&#10;B) less than mg&#10;C) equal to mg&#10;D) depends on the speed of the elevator

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Question 51

A blue ball is dropped from the roof of a tall building simultaneously with the horizontal launch of a red ball.Which statement is true?&#10;A) the red ball strikes the ground first with the higher speed&#10;B) both balls hit the ground at the same time,but the red ball has the higher speed&#10;C) the blue ball strikes the ground first,but with the lower speed&#10;D) both balls hit the ground at the same time with the same speed

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Question 52

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 53

An object of mass m is hanging by a string from the roof of an elevator.The elevator is slowing down.What is the tension in the string?&#10;A) greater than mg&#10;B) less than mg&#10;C) equal to mg&#10;D) depends on the speed of the elevator

Accepted Answer

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Question 54

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 55

A rocket is launched from the origin with an acceleration of 20.0 m/s² at an angle of 30.0 degrees above the horizontal.The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted.The rocket then falls with an acceleration of 9.80 m/s² downward.What is the X distance (range)when the rocket hits the ground?

A) 153 m
B) 166 m
C) 187 m
D) 205 m
E) 230 m

Accepted Answer

The answer of A rocket is launched from the origin...

Question 56

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 57

A rocket is launched from the origin with an acceleration of 20.0 m/s² at an angle of 30.0 degrees above the horizontal.The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted.The rocket then falls with an acceleration of 9.80 m/s² downward.What is the X distance (range)when the rocket hits the ground?

A) 153 m
B) 166 m
C) 187 m
D) 205 m
E) 230 m

Accepted Answer

The answer of A rocket is launched from the origin...

Question 58

A rocket is launched from the origin with an acceleration of 20.0 m/s² at an angle of 30.0 degrees above the horizontal.The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted.The rocket then falls with an acceleration of 9.80 m/s² downward.What is the maximum height?

A) 22.3 m
B) 27.5 m
C) 30.5 m
D) 36.7 m
E) 20.0 m

Accepted Answer

The answer of A rocket is launched from the origin...

Question 59

A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal.The projectile lands on a roof that is 4.0 m height.What is the distance along the horizontal axis when the projectile hits the roof?

A) 25.8 m
B) 22.3 m
C) 19.4 m
D) 17.5 m
E) 15.0 m

Accepted Answer

The answer of A projectile is projected from the origin...

Question 60

You are standing on a bathroom scale in an elevator that is not moving and it reads 500 N.The elevator then moves downward at a constant velocity of 4.50 m/s.What does the scale read?&#10;A) 100 N&#10;B) 450 N&#10;C) 500 N&#10;D) 750 N&#10;E) 250 N

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Question 61

A baseball is struck by a batter at an angle such that it reaches its maximum height at the location of the pitcher &#8211; and just grazes the top of the pitcher&#8217;s head (at an elevation of 1.50 m above the launch point of the baseball).  The pitcher is a horizontal distance of 20.0 m from the point at which the ball was struck.  What was the launch speed for the baseball?&#10;A) 37 m/s &#10;B) 36 m/s &#10;C) 51 m/s &#10;D) 27 m/s

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Question 62

A 92.5 kg stunt man stands on a piston that will launch him out of a vertical tube.The piston applies a constant force F to the man's feet.Starting from rest,the force is applied as the man moves vertically 3.25 m,and while the piston is pushing,the man attains a velocity of 25.5 m/s.What was the man's apparent weight during this time interval?&#10;A) 9.3 kN&#10;B) 18.5 kN&#10;C) 19.4 kN&#10;D) 10.2 kN

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Question 63

A sprinter runs 100.0 m.If he travels at constant acceleration of 1.95 m/s² for the first 6.00 s and then at constant velocity for the remaining time,what was his average velocity? A) 8.8 m/s B) 10.2 m/s C) 9.9 m/s D) 9.8 m/s

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Question 64

On the way to lower floors,an elevator begins its descent from rest at a constant acceleration,descending the first 5.0 m in 0.85 s.What is the apparent weight of a 75 kg man inside the accelerator during this time interval?&#10;A) 0.74 kN&#10;B) 1.8 kN&#10;C) 0.30 kN&#10;D) 1.0 kN

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Deck 4: Motion With Constant Acceleration