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Physics.endew > Physics 1320 > Flashcards

Physics 1320 Flashcards

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1
Q

We can explain the recoil that occurs when a ruffle is fired by using the conservation of:

  • kinetic force
  • mass
  • work
  • momentum
A

momentum

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2
Q

Which of the following is not a vector quantity?

  • acceleration
  • force
  • weight
  • All of the previous are vector quantities
A

All of the previous are vector quantities

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3
Q

A boxcar traveling at 10 m/s approaches a string of three identical boxcars sitting stationary on the track .
The moving boxcar collides and links with the stationary cars, and the four move off together along the track . What is the final speed of the four cars immediately after the collision ?
(You may take the mass of each boxcar to be 18 537 kg.)

  • 2m/s
  • 2.5 m/s
  • 10 m/s
  • 3.33 m/s
A

2.5 m/s

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4
Q

All of the following are requirements for becoming a physics law EXCEPT

  • It must account for known data
  • must make testable predictions
  • It must be able to be easily memorized
  • It must have scientific basis
A

It must be easily memorized

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5
Q

How many meters are there in 0.1 kilometer?

  • 10
  • 100
  • 1000
  • 10 000
A

100

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6
Q

The diameter of a typical atom is approximately 0.000 000 000 1 meter.
This can also be written as:

  • 1 * 10 ^ 10
  • 1* 10 ^ - 7
  • 1 * 10 ^ - 10
  • 1 * 10 ^ - 11
A

1 * 10 ^ - 10

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7
Q

A 3-kg ball traveling to the right with a speed of 4 m/s collides with a 4 -kg ball traveling to the left with a speed of
3 m/s.
What is the total momentum of the two balls before and after the collision?

  • zero
  • 24 kg*m/s
  • 12 kg*m/s
  • The momentum will be different before and after the collision.
A

zero

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8
Q

Which of the following will cause the largest change in the momentum of an object?

A force of___acting for___

  • 3N … 6s
  • 4N … 5s
  • 5N … 5s
  • 6N … 3s
A

5N … 5 s

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9
Q

A clay ball and a rubber ball have equal mass. A student releases each ball from rest at the same height. The clay ball sticks to the ground while the rubber ball bounces back up. The magnitude of the impulse delivered to the rubber ball by the floor is

  • greater than that delivered to the clay ball by the floor
  • less than that delivered to the clay ball by the floor
  • equal to that delivered to the clay ball by the floor
  • not enough information to determine
A

greater than that delivered to the clay ball by the floor

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10
Q

Padded dashboards in automobiles are safer because the:

  • momentum change is less
  • impulse is less
  • impact time is less
  • impact time is longer
A

impact time is longer

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11
Q

A speed of 180 km/hr is equal to ____
m/s.

  • 50
  • 25
  • 150
  • 324
A

50

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12
Q

A speed of 4 ft/s is approximately equal to __ m/hr.

  • 6
  • 367
  • 3292
  • 4389
A

4389

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13
Q

The instantaneous speed of an object is defined to be the:

  • distance it travels divided by the time it takes.
  • distance it travels divided by a very short time interval that covers that distance.
  • change in its velocity divided by the time it takes.
  • change in its velocity multiplied by the time it takes.
A

distance it travels divided by a very short time interval that covers that distance.

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14
Q

A train covers 60 miles between 2 pm and 4 pm
How fast was it traveling at 3 p.m?

  • 15 mph
  • 30 mph
  • 60 mph
  • Not enough information is given to be able to say.
A

Not enough information is given to be able to say.

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15
Q

A yellow card takes 10 minutes to go from milepost 101 to milepost 116. A red car takes 5 minutes to go to from milepost 11 to milepost 16. Which car has the higher average speed?

  • the red one
  • the yellow one
  • their average speeds are the same
  • not enough information to determine
A

the yellow one

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16
Q

How many hours are required to make a 4000-km trip across the United States if you average 80 km/h?

  • 32
  • 50
  • 60
  • 100
A

50

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17
Q

The average acceleration of an object is defined to be the:

  • distance it travels divided by the time it takes
  • change in its speed divided by the time it takes.
  • change in its velocity divided by the time it takes.
  • average of the acceleration during twp halves of the trip.
A

change in its velocity divided by the time it takes.

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18
Q

An object is accelerating:

  • only when its speed changes.
  • only when its direction changes.
  • when its speed or direction changes.
  • not enough information to determine.
A

•when its speed or direction changes.

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19
Q

If a car requires 10 seconds to accelerate from zero to 60 mph, its average acceleration is:

  • 6 mph/second.
  • 10 mph/second.
  • 60 mph/second.
  • 600 mph/second.
A

6 mph/second.

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20
Q

When we say that light and heavy objects fall at the same rate, what assumption are we making?

  • They have the same shape.
  • They are falling in a vacuum.
  • They are made of the same material.
  • They have the same size.
A

They are falling in a vacuum.

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21
Q

An object is dropped off a cliff, How far the object fall during the next 5 s?

  • 45 m
  • 20 m
  • 80 m
  • 125 m
A

125 m

22
Q

A rock is thrown vertically upward with a speed of 25 m/s from the top of a high rise building. What is the rock’s speed and direction 4 s later (assuming it doesn’t hit the building)?

  • 5 m/s downward
  • 5 m/s upward
  • 45 m/s upward
  • 15 m/s downward
A

15 m/s downward

23
Q

A car speeds up from 40 mph to 70 mph to pass a truck. If this requires 6 s, what is the average acceleration of the car?

  • 1 mph/s
  • 3 mph/s
  • 5 mph/s
  • 10 mph/s
A

5 mph/s

24
Q

A small metal ball is given a quick shove and coasts up an inclined track. During this motion, the change in velocity vector and acceleration of the ball:

  • points down the incline
  • points up the incline
  • points horizontal
  • points vertically upward
A

points down the incline

25
Q

The property of an object at rest to remain at rest is known as:

  • inertia
  • resistance
  • inertness
  • sluggishness
A

inertia

26
Q

Assume that you are driving down a straight road at constant speed. A small ball is tied on the end of a string hanging from the rear view mirror. Which way will the ball swing when you use your brakes and slow down?

  • forward
  • backward
  • it will not swing.
  • not enough information to determine.
A

forward

27
Q

A parachutist reaches terminal speed when:

  • her weight goes to zero.
  • the force of air resistance equals her weight.
  • the force of air resistance exceeds her weight.

the force of air resistance equals her mass.

A

the force of air resistance equals her weight.

28
Q

If earth exerts a gravitational force of 5000 N on a satellite in synchronous orbit, what force does the satellite exert on Earth?

  • zero
  • a small friction of 1 N
  • 5 000 N
  • 20 000 N
A

5 000 N

29
Q

Newton’s third law applies to objects that are:

  • the same mass
  • the same size
  • both at rest
  • moving with the same speed
  • none of these; Newton’s third law applies to any pair of objects that exert forces on one another.
A

none of these; Newton’s third law applies to any pair of objects that exert forces on one another.

30
Q

If a race car is traveling around in circular track at a constant speed of 100 mph, we know that the car experiences:

  • no net force.
  • a centripetal force.
  • a centrifugal force.
  • a net force in the forward direction.
A

a centripetal force.

31
Q

If a car is traveling around in circular unbanked track hits a patch of ice, what direction will it go?

  • in the direction of the velocity
  • in the direction of the change in velocity
  • in the direction of the acceleration
  • in the direction of the force
A

in the direction of the change in velocity

32
Q

A gun is held horizontally and fired. At the same time the bullet leaves the gun’s barrel and identical bullet is dropped from the same height.
Neglect air resistance. Which bullet will hit the ground first?

  • The bullet that was fired.
  • The bullet that was dropped.
  • It will be a tie.
  • not enough information to determine.
A

It will be a tie.

33
Q

If we imagine launching an apple into a circular orbit about Earth and ignore the effects of air resistance, we know that the apple will experience:

  • a constant velocity
  • no net force
  • a force due to its inertia
  • a centripetal force due to gravity.
A

a centripetal force due to gravity.

34
Q

The size of the gravitational force that Earth exerts on the Moon is ___ that the Moon exerts on Earth.

  • greater than
  • the same as
  • smaller than
  • not enough information to determine
A

the same as

35
Q

What is the approximate acceleration due to Earth’s gravity at a distance of two Earth radii above Earth’s surface?

  • 1.1 m/s^2
  • 2.5 m/s^2
  • 10 m/s^2
  • 20 m/s^2
A

2.5 m/s^2

36
Q

In the law of universal gravitation, the force___as the mass increases and ___ as the distance increases between the two objects.

  • increases__increases
  • decreases__increases
  • increases__decreases
  • decreases__decreases
A

increases__decreases

37
Q

Does the Moon orbit the Sun?

  • Yes, it goes in a circle about the Sun.
  • No, it orbits Earth.
  • No, but it would if Earth were not present.
  • Yes, but it also orbits Earth.
A

Yes, but it also orbits Earth.

38
Q

Communications satellites are synchronous satellites that orbit Earth each:

  • 90 minutes
  • 24 hours
  • 28 days
  • They don’t orbit Earth; they just stay in one place.
A

24 hours

39
Q

Although Earth gravitational influence gets weaker with distance, we believe that it extends as far as the

  • Sun
  • edge of the solar system
  • universe extends
A

universe extends

40
Q

Which has the greater momentum, a heavy truck at rest or a moving roller skater?

  • Cannot tell from the information given.
  • the roller skater
  • the heavy truck
  • the momenta are equal
A

the roller skater

41
Q

Padded dashboards in automobiles are safer because the:

  • momentum change is less
  • impulse is less
  • impact time is less
  • impact time is longer
A

impact time is longer

42
Q

Besides the United States, which of the following major countries has not adopted the metric system of units?

  • No other
  • Great Britain
  • Australia
  • Russia
A

No other

43
Q

An migrating bird is initially flying south at 8 m/s. To avoid hitting a high-rise building, the bird veers and changes its velocity to 6 m/s east over a period of 4s. What is the magnitude of the bird’s average acceleration during this 4s interval?

  • 0.5 m/s^2
  • 2.5 m/s^2
  • 5 m/s^2
  • 10 m/s^2
A

2.5 m/s^2

44
Q

Which of the following expressions gives the number of seconds in one week?

• 7 days 24 h 3600 s
_____ x _____ x _____
1 week 1 day 1 h

• 7 days 1 day 1 h
_____ x _____ x _____
1 week 24 h 3600s

• 1 week 24 h 3600s
_____ x _____ x _____
7 days 1 day 1 h

• 1 week 1 day 1h
_____ x _____ x _____
7 days 24 h 3600 s

A

• 7 days 24 h 3600 s
_____ x _____ x _____
1 week 1 day 1 h

45
Q

What is the net force on a 900-kg airplane flying with a constant velocity of 180 km/hour north?

  • 0 N
  • 180 N
  • 900 N
  • 162 000 N
A

0 N

46
Q

What is the mass of a cart that has an acceleration of
1 m/s^2 when a net force of 2000 N is applied to it?

  • 8 000 kg
  • 2 000 kg
  • 5 000 kg
  • 500 kg
A

2 000 kg

47
Q

The strength of gravity on the Moon is only 1/6th that on Earth. If an astronaut has a weight of 120 lb on earth, what would her weight be on the Moon?

  • 20 lb
  • 40 lb
  • 80 lb
  • 120 lb
A

20 lb

48
Q

What is the change in velocity if a car traveling 40 m/s north slows to 30 m/s north?

  • 20 m/s north
  • 10 m/s north
  • 10 m/s south
  • 20 m/s south
A

10 m/s south

49
Q

A cyclist turns a corner with a radius of 50 m at a speed of 20 m/s. What is the magnitude of the cyclist’s acceleration?

  • 0.4 m/s^2
  • 2.5 m/s^2
  • 8 m/s^2
  • 10 m/s^2
A

8 m/s^2

50
Q

After being hit, a baseball has a horizontal speed of 20 m/s and a vertical speed of 25 m/s upward. Ignoring air resistance what are these speeds 1 s later?

  • 20 m/s horizontal and 25 m/s vertical
  • 20 m/s horizontal and 15 m/s vertical
  • 10 m/s horizontal and 25 m/s vertical
  • 20 m/s horizontal and 35 m/s vertical
A

20 m/s horizontal and 15 m/s vertical

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