Deck 1: Introduction to Physics

Question 1

To convert a quantity from km/h · s) to m/s², you must

A) multiply by 1000 and divide by 60.
B) multiply by 1000 and divide by 3600.
C) multiply by 60 and divide by 1000.
D) multiply by 3600 and divide by 1000.
E) None of these options are correct.

Answer 1

multiply by 1000 and divide by 3600.

Question 2

The density of seawater was measured to be 1.07 g/cm³. This density in SI units is

A) 1.07*10^-3 kg/m³
B) 1/1.07) *10³ kg/m³
C) 1.07 * 10³ kg
D) 1.07 *10^-3 kg
E) 1.07 * 10³ kg/m³

Answer 2

1.07 * 10³ kg/m³

Question 3

The prefix "micro" means

A) 10^-12.
B) 10^-6.
C) 10^-3.
D) 10^-2.
E) 10^-1.

Answer 3

10^-6.

Question 4

To convert a quantity from g/cm³ to kg/m³, you must

A) multiply by 0.01.
B) multiply by 100.
C) multiply by 1000.
D) multiply by 0.001.
E) multiply by 1,000,000.

Question 5

The prefix "milli" means

A) 10^-12.
B) 10^-6.
C) 10^-3.
D) 10^-2.
E) 10^-1.

Question 6

Which of the following is NOT one of the fundamental units in the SI system?

A) Newton
B) meter
C) kilogram
D) second
E) All of these choices are fundamental units in the SI system

Question 7

Which of the following is a fundamental unit of the SI system of units?

A) kilometer
B) joule
C) kilogram
D) gram
E) newton

Question 8

The prefix "mega" means

A) 10².
B) 10⁹.
C) 10^-3.
D) 10⁶.
E) 10^-6.

Question 9

The prefix "giga" stands for

A) 10¹².
B) 10⁶ .
C) 10³.
D) 10⁹.
E) 10¹⁵.

Question 10

The prefix "nano" means

A) 10^-12.
B) 10^-6.
C) 10^-3.
D) 10^-2.
E) None of these is correct.

Question 11

To convert a quantity from m/s to km/h, you must

A) multiply by 1000 and divide by 60.
B) multiply by 1000 and divide by 3600.
C) multiply by 60 and divide by 1000.
D) multiply by 3600 and divide by 1000.
E) None of these options are correct.

Question 12

Which of the following prefixes does NOT represent a fractional part of a whole unit?

A) nano
B) micro
C) kilo
D) milli
E) deci

Question 13

The prefix "pico" means

A) 10^-12.
B) 10^-6.
C) 10^-3.
D) 10⁶.
E) 10⁹.

Question 14

To convert a quantity from km/h to m/s, you must

A) multiply by 1000 and divide by 60.
B) multiply by 1000 and divide by 3600.
C) multiply by 60 and divide by 1000.
D) multiply by 3600 and divide by 1000.
E) None of these options are correct.

Question 15

The fundamental physical quantities are

A) mass, length, time, temperature, amount of a substance, current, and luminous intensity.
B) weight, length, time, temperature, amount of a substance, current, and luminous intensity.
C) mass, length, time, temperature, force, current, and luminous intensity.
D) mass, length, time, force, momentum, amount of a substance, and current.
E) weight, length, time, temperature, amount of a substance, potential energy, and luminous intensity.

Question 16

Which of the following is NOT one of the fundamental physical quantities in the SI system?

A) mass
B) length
C) force
D) time
E) All of these are fundamental physical quantities in the SI system.

Question 17

Which of the following prefixes does NOT represent a quantity larger than a single unit?

A) kilo
B) mega
C) giga
D) tera
E) femto

Question 18

The prefix "kilo" means

A) 10^-12.
B) 10^-6.
C) 10^-3.
D) 10³.
E) 10¹.

Question 19

The prefix "centi" means

A) 10^-12.
B) 10^-6.
C) 10^-3.
D) 10^-2.
E) 10^-1.

Question 20

The SI unit for mass is

A) " $\mu$ g"
B) "mg"
C) "g"
D) "kg"
E) "lb"

Question 21

Earth's population, expressed as an order of magnitude, is closest to

A) 10⁶.
B) 10¹⁰.
C) 10⁵.
D) 10⁸.
E) 10⁷.

Question 22

What is the order of magnitude of Earth's tallest mountain heights?

A) 10⁸ m
B) 10⁴ m
C) 10⁶ m
D) 10³ m
E) 10⁵ m

Question 23

The longest bridge on Earth is of the order of

A) 10³ m.
B) 10⁴ m.
C) 10⁵ m.
D) 10⁶ m.
E) 10⁷ m.

Question 24

A person inhales about 1 L of air per breathe. Estimate the number of air molecules inhaled.

A) 10¹⁰.
B) 10¹⁴.
C) 10¹⁸.
D) 10²².
E) 10²⁶.

Question 25

The measurement 23.0040 has _____ significant figures.

A) six
B) three
C) five
D) four
E) two

Question 26

The size of a proton is of the order of 10^-15 m and the size of the visible universe is of the order of 10²⁶ m. From this information you can conclude that

A) the size of the universe is 26 orders of magnitude greater than that of the proton.
B) the size of the universe is 41 orders of magnitude greater than that of the proton.
C) the size of the proton is 11 orders of magnitude greater than that of the universe.
D) the size of the universe is 15 orders of magnitude greater than that of the proton.
E) the size of the proton is 15 orders of magnitude greater than that of the universe.

Question 27

An impurity in a manufacturing process will cause a batch to be rejected if the impurity exceeds one part per million. What is the maximum amount of impurity that could be present if the batch contains 100 kg of the product?

A) 100 micrograms
B) 100 Nanograms
C) 100 grams
D) 100 megagrams
E) 100 nanograms

Question 28

The mass of an electron is of the order of 10^-30 kg and the mass of the universe is believed to be of the order of 10⁵² kg. From this information you can conclude that

A) the mass of Earth is 52 orders of magnitude greater than that of the electron.
B) the mass of Earth is 30 orders of magnitude greater than that of the electron.
C) the mass of the electron is 82 orders of magnitude greater than that of Earth.
D) the mass of Earth is 82 orders of magnitude greater than that of the electron.
E) the mass of the electron is 30 orders of magnitude greater than that of Earth.

Question 29

Which of the following represents a value of current measured to at least five significant figures?

A) 2.375 * 10⁴ A
B) 0.00347 A
C) 3.0* 10⁵ A
D) 23.75 * 10¹ A
E) 50.300 A

Question 30

The measurement 5.130 *10^-4 has _____ significant figures.

A) two
B) three
C) one
D) seven
E) four

Question 31

The momentum of a body is defined to be the product of its mass and its velocity. If the mass of an air-track glider is known to be 225 g and its velocity is measured to be 3.1 cm/s, its momentum should be reported as

A) 697.5 g · cm/s.
B) 698 g · cm/s.
C) 7.0 * 10² g · cm/s.
D) 6.98 * 10² g · cm/s.
E) 6.975 *10² g · cm/s.

Question 32

Estimate the number of raindrops needed to fill a volume of 1m * 1m*1cm.

A) 10³
B) 10⁵
C) 10⁷
D) 10⁹
E) 10¹¹

Question 33

You are traveling at a speed of 80 km/h. Your speed in mph is approximately

A) 30.
B) 40.
C) 50.
D) 60.
E) 70.

Question 34

In doing a calculation, you end up with a fraction having m/s in the numerator and m/s² in the denominator. The result will have units of

A) m²/s³.
B) s^-1.
C) s³/m².
D) s.
E) m/s.

Question 35

The number of seconds in a month is of the order of

A) 10³.
B) 10⁸.
C) 10⁵.
D) 10¹⁰.
E) 10⁶.

Question 36

The density of an object equals its mass divided by its volume. The mass of Earth is 6 * 10²⁴ kg and its radius is 4*10³ miles. The mass of the Sun is 2* 10³³ g and its radius is 7 * 10⁵ km. Determine the ratio of the Earth's density to that of the Sun.

A) 4 *10^-1
B) 4 * 10²
C) 4 * 10⁰
D) 4 *10¹
E) None of these choices

Question 37

In doing a calculation, you arrive at an expression in which the numerator is in kilometers and the denominator is in meters per second. When the calculation is completed, the result will be in units of

A) meters, if you divide by 1000.
B) meters, if you multiply by 1000.
C) seconds, if you divide by 1000.
D) seconds, if you multiply by 1000.
E) meters squared per second, if you multiply by 1000.

Question 38

The net force acting on a body is defined to be the product of the mass of the body and its resultant acceleration. If the mass of a body is known to be 184 kg and its acceleration is measured to be 2.4 m/s², the resultant force should be reported as

A) 4.4 * 10² kg · m/s².
B) 441.6 kg · m/s².
C) 442 kg · m/s².
D) 4.416 kg · m/s².
E) 4.42 * 10² kg · m/s².

Question 39

When we look up in the sky the Sun appears about as big as the moon; however, we know that the Sun is much further away. Given that the radius of the Sun is about 7 * 10⁸ m and that the radius of the moon is about 2 * 10⁶ m, calculate approximately the number of times the moon could fit inside the Sun.

A) 4 * 10²
B) 4 * 10⁶
C) 4 * 10⁷
D) 1 * 10⁵
E) 2 *10⁵

Question 40

Light travels at 3 *10⁸ m/s, and it takes about 8 min for light from the sun to travel to Earth. Based on this, the order of magnitude of the distance from the sun to Earth is

A) 10¹⁰ m.
B) 10⁸ m.
C) 10⁹ m.
D) 10⁶ m.
E) 10¹¹ m.

Question 41

If x and t represent position and time, respectively, the A in x = A cos Bt) must

A) have the dimensions ML/T ².
B) have the dimensions M.
C) have the dimensions L.
D) have the dimensions L²/T ².
E) be dimensionless.

Question 42

Density of styrofoam is . This number has

A) 1 significant digit.
B) 2 significant digits.
C) 3 significant digits.
D) 4 significant digits.
E) 5 significant digits.

Question 43

In the expression F_net = ma, m must have the dimensions

A) ML/T ².
B) M.
C) L/T ².
D) L/T.
E) ML²/T ².

Question 44

Light travels at 3 *10⁸ m/s, and the size of a proton is about 1 fm. Calculate the order of magnitude for the time taken for light to pass across a proton.

A) s
B) s
C) s
D) s
E) s

Question 45

When writing a number, all zeros to the right of the decimal point are significant figures,

Question 46

When adding or subtracting numbers, the result should have the same number of digits to the right of the decimal point as the input number with the most digits to the right of the decimal point.

Question 47

If K has dimensions ML²/T ², the in K = mv ² must

A) have the dimensions ML/T ².
B) have the dimensions M.
C) have the dimensions L/T ².
D) have the dimensions L²/T ².
E) be dimensionless.

Question 48

If you have a music CD collection of about 150 discs, estimate the order of magnitude of the number of heartbeats you would have if you listened all the way through your collection.

A) 10⁶
B) 10⁸
C) 10¹⁰
D) 10⁴
E) 10³

Question 49

If x and t represent position and time, respectively, the B in x = A cos Bt) must

A) have the dimensions ML/T ².
B) have the dimensions .
C) have the dimensions L/T ².
D) have the dimensions L²/T ².
E) be dimensionless.

Question 50

When multiplying or dividing numbers, the result has the same numbers of significant figures as the input number with fewest significant figures.

Question 51

If v and t represent velocity and time, respectively, C₁ in must

A) have the dimensions L/T.
B) have the dimensions M.
C) have the dimensions L/T ².
D) have the dimensions L²/T ².
E) be dimensionless.

Question 52

If x and t represent distance and time, respectively, the C in x = ¹/2Ct ² must

A) have the dimensions ML/T ².
B) have the dimensions M.
C) have the dimensions L/T ².
D) have the dimensions L²/T ².
E) be dimensionless.

Question 53

In Newton's law of gravity the universal gravitational constant is G = Fr²/m₁m₂, where F is the gravitational force between the two masses, m₁ and m₂, and r is the distance between them. What are the dimensions of G?

A) L²M^-1T ².
B) L³M^-1T ^-2
C) L²M^-2T ^-2
D) L³M^-1T ².
E) L^-3M¹T ³.

Question 54

The dimensions of mass density are

A) MLT ^-1.
B) ML³.
C) ML².
D) ML^-1.
E) None of these are correct.

Question 55

If Earth is approximately 4.5 billion years old, estimate the order of magnitude for the number of times it has rotated about its own axis. Assume a constant rate of rotation.)

A) 10⁹
B) 10¹⁰
C) 10¹¹
D) 10¹²
E) 10¹⁴

Question 56

If v and t represent velocity and time, respectively, C₂ in must

A) have the dimensions ML/T ².
B) have the dimensions .
C) have the dimensions L/T ².
D) have the dimensions L²/T ².
E) be dimensionless.

Question 57

The dimensions of energy, E, are ML²/T ². Using dimensional analyzes, E is the product of which two quantities?

A) Mass divided by time squared
B) Force times acceleration
C) Mass times acceleration
D) Force times distance
E) Force times time

Question 58

The dimensions of two quantities MUST be identical if you are either __________ or __________ the quantities.

A) adding; multiplying
B) subtracting; dividing
C) multiplying; dividing
D) adding; subtracting
E) All of these are correct

Question 59

The second is defined to be the amount of time required for a cesium atom to emit 9,192,631,770 cycles of radio waves. The number of significant digits in the quoted value is

A) 3.
B) 6.
C) 9.
D) 10.
E) impossible to identify.

Question 60

A diehard music lover still prefers to listen to his vinyl records, which rotate at 33^1/3 revolutions per minute. If he listens for an average of three hours per day, estimate the order of magnitude for the number of revolutions his turntable makes in a year.

A) 10⁷
B) 10²
C) 10⁶
D) 10⁵
E) 10⁴