Deck 8: Time and Time-Related Variables in Engineering

Question 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.

Answer 1

True

Question 2

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

Answer 2

C

Question 3

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.

Answer 3

B

Question 4

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

A)
B)
C)
D)

Question 5

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

Question 6

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

Question 7

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

Question 8

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)

Question 9

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

Question 10

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

Question 11

Period and frequency mean the same thing.

Question 12

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)

Question 13

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)

Question 14

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

Question 15

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

Question 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)

Question 17

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)

Question 18

Most engineering problems may be divided into two broad areas: steady and unsteady.

Question 19

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

Question 20

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

Question 21

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

Question 22

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

Question 23

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.

Question 24

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

Question 25

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

Question 26

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

Question 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?

Question 28

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?

Question 29

A car traveling at constant speed as it rounds a curve is not accelerating.

Question 30

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

Question 31

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

Question 32

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?

Question 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

Question 34

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?

Question 35

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?

Question 36

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?