Deck 8: Time and Time-Related Parameters

Question 1

While in the stands at a soccer game you notice a player kick a soccer ball.If the player is away from you when he kicks the ball, how long does it take the sound of the "kick" to reach your ears? Assume the speed in air is

Answer 1

D

Question 2

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?

Answer 2

D

Question 3

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?

Answer 3

D

Question 4

A car travels along a certain road at an average speed of 60 kmph and returns along the same road at an average speed of 20 kmph.Calculate the average speed for the round trip.

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

Question 5

Which of the following control mechanisms in an automobile causes acceleration?

A)Steering wheel
B)Gas pedal
C)Brake pedal
D)All of the above
E)None of the above

Question 6

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 7

Considering the equation , explain why a fly swatter is more effective than trying to
swat a fly with your bare hand.

Question 8

Considering the equation , explain why a tennis racquet moves much faster than your
hand when you hit a tennis ball.

Question 9

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 10

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.

Question 11

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 6 seconds for the sound of
Thunder to reach you.Assuming the speed of sound in air to be $340 \mathrm {~m} / \mathrm { s } \text {, }$ , how far away was the
Lightning strike?

A)1 kilometer
B)2 kilometers
C)5 kilometers
D)10 kilometers

Question 12

Ten seconds after starting from rest, a car is moving at 40ms .What is the car's acceleration in meters per second per second?

Question 13

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

Question 14

While in the stands at a soccer game you notice a player kick a soccer ball.If the player is $300 \mathrm {~m}$ away from you when he kicks the ball, how much time transpires between the kick and your visual perception of the kick? (The speed of light is approximately $\left. 3 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

A)1 nanosecond
B)1 microsecond
C)1 millisecond
D)1 second

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

You are at a large outdoor concert, seated 300 meters from the speaker system.The concert is also being simulcast live via satellite.A friend of yours is listening to the broadcast from a
Total of $5000 \mathrm {~km}$ away (distance to-and-from the satellite).Who hears the concert first?

A)You
B)Your friend

Question 17

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 18

A slightly eccentric engineering professor rides a motorcycle whose front wheel has a diameter of $60 \mathrm {~cm}$ .While riding the motorcycle he notices that the front wheel is rotating at 220
Rpm)How fast is the motorcycle going?

A)13.2 kmph
B)25 kmph
C)44 kmph
D)60 kmph

Question 19

A floating leaf bobs up and down two complete cycles each second as water waves pass by at
a speed of $10 \mathrm {~m} / \mathrm { s }$ .How far apart are the waves?

A) 1 meter
B) 2 meters
C) 5 meters
D) 20 meters

Question 20

If the pitcher's mound and home plate are 50 m apart, how much time (in seconds) does the batter have to react to a 90 kmph fast ball?

Question 21

The 60cm diameter front wheel of a motorcycle is spinning at 265 rpm without slipping as the motorcycle translates along.What is the translational speed of the motorcycle?

Question 22

When the "A" string of a properly tuned violin is plucked, it takes 2.27ms to return to its
starting position.What is the frequency of this oscillation?

Question 23

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

A)One meter per second
B)One and half meters per second
C)Two meters per second
D)Three meters per second

Question 24

A unit of measure commonly used to quantify liquid flow is lpm.What does lpm stand for?

A)Low pressure measurement
B)Liters per minute
C)Low power motor

Question 25

Time is a fundamental dimension.

Question 26

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 700 meters long, how much time elapses
between the two sounds?

Question 27

It takes 10 seconds to fill a 5-liter 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 28

While filling up your car with gasoline, you notice that it takes 90 seconds to dispense 15 liters of gasoline.What is the average flow rate in lpm?

A)30
B)45
C)60
D)90

Question 29

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

Question 30

A certain medical imaging device commonly referred to as "ultrasound" creates sound by
oscillating with a frequency of 2.5MHz .What is the period of this oscillation?

Question 31

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

Question 32

The energy that heats Earth is caused by nuclear reactions and explosions on the surface of the Sun, sometimes called "solar flares." When a solar flare occurs, how long does it take before

Question 33

The speed of sound in air is approximately .The speed of light in air is approximately .If a lightning strike occurs 3 km away, how much time elapses before you hear the
thunder?

Question 34

While filling up your car with gasoline, you notice that it takes 90 seconds to dispense 15 liters of gasoline through the 2.5-centimeter diameter hose.What is the average speed, in meter
Per second, of the gasoline inside the hose?

A)0.75
B)1
C)1.5
D)3

Question 35

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 36

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 37

A tire 1 meter in diameter rotates at a constant rate of .What is the speed of a small stone lodged in the tread of the tire on its outer edge?

Question 38

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 1.94 seconds elapses between the two distinct sounds,
how long is the steel pipe?

Question 39

The speed of sound in air is approximately .The speed of light in air is approximately If 8.8 seconds elapses between seeing a lightning strike and hearing the thunder, how
far away was the lightning strike?

Question 40

The frequency of "concert A" on a typical musical instrument is .What is the time
for one complete oscillation?

Question 41

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 42

Period and frequency mean the same thing.

Question 43

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 44

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

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

Question 45

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

Question 46

The translational speed of a motorcycle is 20 mph.What is the rotational speed of the $$63.5 -$$ cm-diameter front wheel?

A)230 rpm
B)240 rpm
C)250 rpm
D)260 rpm

Question 47

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.

Question 48

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 49

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 50

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.