# Quiz 8: Time and Time-Related Variables in Engineering

Engineering

Q 1Q 1

Time is a fundamental dimension and plays an important role in our daily life in describing events, processes, and many occurrences in our surroundings.

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True False

True

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True False

True

Q 3Q 3

The problem is said to be steady when the value of a physical quantity under investigation changes over time.

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True False

False

Q 4Q 4

Because it takes the earth 24 hours to complete one revolution about its axis, every 15 degrees longitude corresponds to 1 hour.

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True False

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True False

Q 6Q 6

If you pull a pendulum back and let it go, the time required for it to return to approximately the same place from which it was released is called
A)the period
B)the frequency
C)the natural frequency
D)the amplitude

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Multiple Choice

Q 7Q 7

If the pitcher's mound and home plate are apart, how much time (in seconds) does the batter have to react to a fastball?
A)0.45 seconds
B)1 second
C)1.5 seconds
D)2 seconds

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Multiple Choice

Q 8Q 8

A jiffy is the amount of time it takes light to travel one centimeter.If the speed of light is approximately , how many seconds are in a jiffy?
A)
B)
C)
D)

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Multiple Choice

Q 9Q 9

A useful variable of traffic information is density-how many cars occupy a stretch of a highway.

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True False

Q 10Q 10

A car starting from rest has a constant acceleration of 4 m/s2.How fast will it be going in 5 seconds?
A)
B)
C)
D)

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Multiple Choice

Q 11Q 11

A car starts from rest and 5 seconds later it is going .What is the car's average acceleration?
A)
B)
C)
D)

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Multiple Choice

Q 12Q 12

A car starting from rest has a constant acceleration of 5 m/s2.How long will it take to reach a speed of ?
A)
B)
C)
D)

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Multiple Choice

Q 13Q 13

A car traveling at constant speed as it rounds a curve is not experiencing angular acceleration.

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True False

Q 14Q 14

Ten seconds after starting from rest, a motorcycle is moving at 20 m/s.What is the motorcycle's acceleration in m/s2? Assume constant acceleration.
A)
B)
C)
D)

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Multiple Choice

Q 15Q 15

Comparing speed and velocity,
A)speed is a vector quantity and therefore includes direction.
B)velocity is a vector quantity and therefore includes direction.
C)speed and velocity mean the same thing.
D)none of the above apply.

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Multiple Choice

Q 16Q 16

A car travels along a certain road at an average speed of and returns along the same road at an average speed of .Calculate the average speed for the round trip.
A)
B)
C)
D)
E)

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Multiple Choice

Q 17Q 17

A slightly eccentric engineering professor rides a motorcycle whose front wheel has a diameter of .While riding the motorcycle he notices that the front wheel is rotating at .How fast is the motorcycle going?
A)11 mph
B)21 mph
C)31 mph
D)41 mph

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Multiple Choice

Q 18Q 18

A thunderstorm is brewing in the distance.Upon seeing a flash of lightning you begin counting the seconds until you hear the thunder and notice that it took 5 seconds for the sound of thunder to reach you.Assuming the speed of sound in air to be , estimate how far away was the lightning strike?
A)1.6 km
B)3.2 km
C)8 km
D)16 km

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Multiple Choice

Q 19Q 19

When a solar flare occurs, how long does it take before a scientist sees it? (The Earth-Sun distance is and the speed of light is approximately .
A)8 microseconds
B)8 milliseconds
C)8 seconds
D)8 minutes

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Multiple Choice

Q 20Q 20

A unit of measure commonly used to quantify air flow is cfm.What does cfm stand for?
A)Correct Fan Measurement
B)Cubic Fan Measurement
C)Cubic Feet per Minute

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Multiple Choice

Q 21Q 21

A unit of measure commonly used to quantify liquid flow is gpm.What does gpm stand for?
A)Global Positioning Mechanism
B)Gallons per Minute
C)Greenhouse Pressure Measurement

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Multiple Choice

Q 22Q 22

The speed of sound in air is approximately .The speed of light in air is approximately .If a lightning strike occurs three kilometers away, how much time elapses before you hear the thunder?

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Essay

Q 23Q 23

The speed of sound in air is approximately .The speed of sound in steel is approximately .If your friend strikes one end of a steel pipe with a hammer while you listen at the other end, you will hear two distinct sounds: one traveling through the air and the other traveling through the steel pipe.If the pipe is 200 meters long, how much time elapses between the two sounds?

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Essay

Q 24Q 24

The speed of sound in air is approximately .The speed of light in air is approximately .If 10 seconds elapses between seeing a lightning strike and hearing the thunder, how far away was the lightning strike?

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Essay

Q 25Q 25

A certain medical imaging device commonly referred to as "ultrasound" creates sound by oscillating with a period of .What is the frequency of this oscillation?

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Essay

Q 26Q 26

A certain medical imaging device commonly referred to as "ultrasound" creates sound by oscillating with a frequency of .What is the period of this oscillation?

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Essay

Q 27Q 27

When the "A" string of a properly tuned violin is plucked, it takes to return to it's starting position.What is the frequency of this oscillation?

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Essay

Q 28Q 28

If a wheel, turning at a constant angular speed, makes ten complete revolutions every second, what is the angular speed, in radians per second?

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Essay

Q 29Q 29

If a wheel, turning at a constant angular speed, makes 5 complete revolutions every second, what is the angular speed, in revolutions per minute?

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Essay

Q 30Q 30

A person walks from home to a store with an average speed of 0.91 m/s.When returning home from store, she jogs with an average speed of 1.83 m/s, following her original path.What is the average speed for the round trip?
A)0.91 m/s
B)1.22 m/s
C)1.37 m/s
D)1.83 m/s

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Multiple Choice

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True False

Q 32Q 32

While filling up your car with gasoline, you notice that it takes 3 minutes to dispense 56.8 liters of gasoline.What is the average flow rate in liters per minute?
A)11.4
B)18.9
C)37.9
D)56.8

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Multiple Choice

Q 33Q 33

While filling up your car with gasoline, you notice that it takes 3 minutes to dispense 55 liters of gasoline through the 2.5 cm diameter hose.What is the average speed, in m/s, of the gasoline inside the hose?
A)2.48
B)0.62
C)6.2
D)0.248

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Multiple Choice

Q 34Q 34

It takes 10 seconds to fill a 0.95-liter jar with water from your kitchen faucet.What is the flow rate, in liters per minute, from the faucet?
A)5.7
B)15.1
C)37.9
D)151.4

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Multiple Choice

Q 35Q 35

Volume flow rate measurements are necessary to determine the amount of water or natural gas being used by us in our homes during a specific period of time.

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True False

Q 36Q 36

The translational speed of a motorcycle is 32.2 km/h.What is the rotational speed of the 62 cm diameter front wheel?
A)250 rpm
B)275 rpm
C)300 rpm
D)325 rpm

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Multiple Choice