Question 1

The figure shows a graph of acceleration-versus-sum of the forces exerted on an object What is the mass of this object? 
A)2.5 g
B)1.6 g
C)630 g
D)400,000 g

Accepted Answer

The answer of The figure shows a graph of acceleration-versus-sum...

Question 2

The figure shows a graph of acceleration-versus-sum of the forces exerted on a 125-g object.What should be the value of the first tick-mark on the vertical scale,as indicated by the arrow in the figure? 
A)4
B)8
C)0.00400
D)0.00800

Accepted Answer

The answer of The figure shows a graph of acceleration-versus-sum...

Question 3

A 45.0-kg person steps on a scale in an elevator.The scale reads 460 N.What is the magnitude of the acceleration of the elevator? A)4.91 m/s² B)9.81 m/s² C)46.9 m/s² D)0.206 m/s² E)0.422 m/s²

Accepted Answer

The answer of A 45.0-kg person steps on a scale...

Question 4

A 10-kg object is hanging by a very light wire in an elevator that is traveling upward.The force that the wire exerts on the object is measured to be 75 N.What are the magnitude and direction of the acceleration of the elevator?

Accepted Answer

The answer of A 10-kg object is hanging by a...

Question 5

A 1200-kg car is pulling a 500-kg trailer along level ground.Neglect the friction force exerted by the road on the trailer.The car accelerates with an acceleration of 1.3 m/s².What is the force exerted by the car on the trailer? A)550 N B)600 N C)650 N D)700 N E)750 N

Accepted Answer

The force exerted by the car on the trailer can be calculated using Newton's second law, $F = ma$, where $m$ is the mass of the trailer and $a$ is the acceleration. Given that the mass of the trailer is 500 kg and the acceleration is 1.3 m/s$^2$, the force is $F = 500 \, \text{kg} \times 1.3 \, \text{m/s}^2 = 650 \, \text{N}$.

Question 6

A 75-N object is pulled on a horizontal surface by a horizontal pull of 50 N to the right.The friction force exerted on this object is 30 N to the left.What is the acceleration of the object? A)0.27 m/s² B)1.1 m/s² C)2.6 m/s² D)11 m/s²

Accepted Answer

The answer of A 75-N object is pulled on a...

Question 7

A block is on a frictionless table,on earth.The block accelerates at 5.3 m/ $\mathrm { s }^2$ when a $10 \mathrm {~N}$ horizontal force is exerted on it.The block and table are set up on the Moon where the acceleration of objects due to the gravitational attraction is 1.62 m/ $\mathrm { s }^2$ A horizontal force of 5 N is now exerted on the block when it is on the Moon.The acceleration of the block due to this force is closest to
A)2.7 m/ $\mathrm { s }^2$
B)2.4 m/ $\mathrm { s }^2$
C)2.9 m/ $\mathrm { s }^2$
D)3.2 m/ $\mathrm { s }^2$
E)3.4 m/ $\mathrm { s }^2$

Accepted Answer

The acceleration of the block on Earth is given by $a = \frac{F}{m}$, where $F = 10 \, \text{N}$ and $a = 5.3 \, \text{m/s}^2$. This gives us the mass $m = \frac{F}{a} = \frac{10}{5.3}$. On the Moon, the same mass is subjected to a 5 N force, so the acceleration $a_{\text{Moon}} = \frac{F_{\text{Moon}}}{m} = \frac{5}{10/5.3} = 2.65 \, \text{m/s}^2$, which is closest to 2.7 m/s².

Question 8

On its own,a tow truck has a maximum acceleration of 3.0 m/s².What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass? A)2.5 m/s² B)2.0 m/s² C)1.5 m/s² D)1.0 m/s²

Accepted Answer

The answer of On its own,a tow truck has a...

Question 9

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s² by means of a rope. (a)What is the magnitude of the force exerted by the rope on the crate? (b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s²?

Accepted Answer

The answer of A 40-kg crate is being lowered with...

Question 10

The figure shows a graph of acceleration-versus-sum of the forces exerted on the objects for three objects pulled by wires.If the mass of object 2 is 36 kg,what are the masses of objects 1 and 3? 
A)12 kg and 90 kg
B)72 kg and 18 kg
C)90 kg and 12 kg
D)12 kg and 72 kg

Accepted Answer

The answer of The figure shows a graph of acceleration-versus-sum...

Question 11

A flatbed truck is carrying an 800-kg load of timber that is not tied down.The maximum friction force that the truck bed exerts on the load is 2400 N.What is the greatest acceleration that the truck can have without losing its load?

Accepted Answer

The answer of A flatbed truck is carrying an 800-kg...

Question 12

A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s.What is the magnitude of the net force exerted on a 68.0 kg passenger during the acceleration?
A)394 N
B)82.0 N
C)342 N
D)311 N

Accepted Answer

First, convert the speed from km/h to m/s: $100 \, \text{km/h} = \frac{100 \times 1000}{3600} \, \text{m/s} = 27.78 \, \text{m/s}$. The acceleration $a$ can be calculated using the formula $a = \frac{\Delta v}{\Delta t}$, where $\Delta v = 27.78 \, \text{m/s}$ and $\Delta t = 4.80 \, \text{s}$, giving $a = \frac{27.78}{4.80} = 5.79 \, \text{m/s}^2$. The force exerted on the passenger can be found using Newton's second law, $F = ma$, where $m = 68.0 \, \text{kg}$ and $a = 5.79 \, \text{m/s}^2$, resulting in $F = 68.0 \times 5.79 = 393.72 \, \text{N}$, which rounds to $394 \, \text{N}$.

Question 13

During a hard stop,a car and its passengers slow down with an acceleration of 8.0 m/s².What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

Accepted Answer

The answer of During a hard stop,a car and its...

Question 14

In a certain particle accelerator,a proton reaches an acceleration of 9.0 × 10¹³ m/s².The mass of a proton is 1.67 × 10^-27 kg.What is the sum of the forces exerted on the proton?

Accepted Answer

The answer of In a certain particle accelerator,a proton reaches...

Quiz 3: Newtonian Mechanics

The figure shows a graph of acceleration-versus-sum of the forces exerted on an object What is the mass of this object?

The figure shows a graph of acceleration-versus-sum of the forces exerted on a 125-g object.What should be the value of the first tick-mark on the vertical scale,as indicated by the arrow in the figure?

A 45.0-kg person steps on a scale in an elevator.The scale reads 460 N.What is the magnitude of the acceleration of the elevator?

A 10-kg object is hanging by a very light wire in an elevator that is traveling upward.The force that the wire exerts on the object is measured to be 75 N.What are the magnitude and direction of the acceleration of the elevator?

A 1200-kg car is pulling a 500-kg trailer along level ground.Neglect the friction force exerted by the road on the trailer.The car accelerates with an acceleration of 1.3 m/s2.What is the force exerted by the car on the trailer?

A 75-N object is pulled on a horizontal surface by a horizontal pull of 50 N to the right.The friction force exerted on this object is 30 N to the left.What is the acceleration of the object?

On its own,a tow truck has a maximum acceleration of 3.0 m/s2.What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope. (a)What is the magnitude of the force exerted by the rope on the crate? (b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?

The figure shows a graph of acceleration-versus-sum of the forces exerted on the objects for three objects pulled by wires.If the mass of object 2 is 36 kg,what are the masses of objects 1 and 3?

A flatbed truck is carrying an 800-kg load of timber that is not tied down.The maximum friction force that the truck bed exerts on the load is 2400 N.What is the greatest acceleration that the truck can have without losing its load?

A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s.What is the magnitude of the net force exerted on a 68.0 kg passenger during the acceleration?

During a hard stop,a car and its passengers slow down with an acceleration of 8.0 m/s2.What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

In a certain particle accelerator,a proton reaches an acceleration of 9.0 × 1013 m/s2.The mass of a proton is 1.67 × 10-27 kg.What is the sum of the forces exerted on the proton?

A 1200-kg car is pulling a 500-kg trailer along level ground.Neglect the friction force exerted by the road on the trailer.The car accelerates with an acceleration of 1.3 m/s².What is the force exerted by the car on the trailer?

On its own,a tow truck has a maximum acceleration of 3.0 m/s².What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s² by means of a rope. (a)What is the magnitude of the force exerted by the rope on the crate? (b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s²?

During a hard stop,a car and its passengers slow down with an acceleration of 8.0 m/s².What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

In a certain particle accelerator,a proton reaches an acceleration of 9.0 × 10¹³ m/s².The mass of a proton is 1.67 × 10^-27 kg.What is the sum of the forces exerted on the proton?