Deck 8: Time and Time-Related Variables in Engineering

Question 1

If a bee flies from a petunia to a marigold, and then returns to the petunia,

A) his average position was zero.
B) his average speed was zero.
C) his average velocity was zero.
D) his average acceleration was zero.

Answer 1

C

Question 2

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 $340 \mathrm {~m} / \mathrm { s }$ , how far away was the
Lightning strike?

A) 1.7 km
B) 2 km
C) 5 km
D) 10 km

Answer 2

1.7 km

Question 3

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.

Answer 3

A

Question 4

1. If the length of a vibrating string is increased, while all other parameters remain the same, the frequency of oscillation

A) increases.
B) decreases.
C) remains the same.

Question 5

A car starting from rest has a constant acceleration of 4 meters per second per second. How long will it take to reach a speed of $20 \mathrm {~m} / \mathrm { s }$ ?

A) 1.25sec
B) 4sec
C) 5sec
D) 20sec

Question 6

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 7

A bee flies from a petunia to a marigold at an average speed of 3 meters per second. Immediately upon reaching the marigold the bee turns around and flies back to the petunia at an
Average speed of 6 meters per second, following his original path. What was the bee's average
Speed for the round trip?

A) 3 meters per second
B) 4 meters per second
C) 4.5 meters per second
D) 6 meters per second

Question 8

A floating leaf bobs up and down two complete cycles each second as water waves pass by five meters apart. How fast are the waves moving?

Question 9

Period and frequency mean the same thing.

Question 10

Ten seconds after starting from rest, a car is moving at . What is the car's acceleration in meters per second per second?

Question 11

Time is a fundamental dimension.

Question 12

While filling up your car with gasoline, you notice that it takes 2 minutes to dispense 15 liters of gasoline. What is the average flow rate in lpm?

A) 2
B) 7.5
C) 15
D) 30

Question 13

It takes 10 seconds to fill a $1 / 4$ ter jar with water from your kitchen faucet. What is the flow rate, in lpm, from the faucet?

A) 1.5
B) 4
C) 10
D) 40

Question 14

If the tension of a vibrating string is increased, while all other parameters remain the same, the frequency of oscillation

A) increases.
B) decreases.
C) remains the same.

Question 15

Comparing average velocity and instantaneous velocity,

A) average velocity is not a vector quantity and therefore doesn't include direction.
B) both terms sometimes refer to the same quantity.
C) the two terms never refer to the same quantity.
D) none of the above apply.

Question 16

A car starting from rest has a constant acceleration of 4 meters per second per second. How fast will it be going in 5 seconds?

Question 17

A car travels along a certain road at an average speed of $60 \mathrm {~m} / \mathrm { s }$ and returns along the same road at an average speed of $20 \mathrm {~m} / \mathrm { s }$ Calculate the average speed for the round trip.

A) 20mph
B) 30mph
C) 40mph
D) 50mph
E) 60mph

Question 18

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

Question 19

The "pitch" of a musical note is most closely associated with a sound wave's

A) period.
B) amplitude.
C) wavelength.
D) frequency.

Question 20

Comparing average acceleration and instantaneous acceleration,

A) average acceleration is not a vector quantity and therefore doesn't include direction.
B) both terms sometimes refer to the same quantity.
C) the two terms never refer to the same quantity.
D) none of the above apply.

Question 21

If a bee flies from a petunia to a marigold, and then returns to the petunia,

A) his average speed was greater than his average velocity.
B) his average velocity was greater than his average speed.
C) his average speed was equal to his average velocity.