Physics Exam 1 MC Questions

The coordinate of an object is given as a function of time by x = 4t^2 - 3t^3, where x is in meters and t is in seconds. Its average acceleration over the interval from t = 0 to t = 2s is

-10 m/s^2

Starting at time t = 0, an object moves along a straight line with velocity in m/s given by v(t) = 98 - 2t^2, where t is in seconds. When it momentarily stops its acceleration is

-28 m/s^2

The coordinate of an object is given as a function of time by x = 7t - 3t^2, where x is in meters and t is in seconds. Its average velocity over the interval from t = 0 to t = 4 is

-5 m/s

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip is

0

The velocity of an object is given as a function o time by v = 4t - 3t^2, where v is in m/s and t is in seconds. Its average velocity over the interval from t = 0 to t = 2s

0

An object is thrown straight down with an initial speed of 4 m/s from a window which is 8 m above the ground. The time it takes the object to reach the ground is

0.93 s

The coordinate of a particle in meters is given by x(t) = 16t - 3.0t^3, where the time t is in seconds. The particle is momentarily at rest at t =

1.3 s

Two automobiles are 150 km apart and traveling toward each other. One automobile is moving at 60 km/h and the other is moving at 40 km/h mph. In how many hours will they meet?

1.5

One object is thrown vertically upward with an initial velocity of 100 m/s and another object with an initial velocity of 10 m/s. The maximum height reached by the first object will be _____ that of the other.

100 times

At a location where g = 9.80 m/s^2, an object is thrown vertically down with an initial speed of 1.00 m/s. After 5.00 s the object will have traveled

127.5 m

An object is released from rest. How far does it fall during the second second of its fall?

15

A stone is thrown vertically upward with an initial speed of 19.5 m/s. It will rise to a maximum height of

19.4 m

A stone is released from a balloon that is descending at a constant speed of 10 m/s. Neglecting air resistance, after 20 s the speed of the stone is

206 m/s

Over a short interval near time t = 0 the coordinate of an automobile in meters is given by x(t) = 27t - 4.ot^3, where t is in seconds. The magnitudes of the initial (at t = 0) velocity and acceleration of the auto respectively are

27 m/s; 0

A heavy ball falls freely, starting from rest. Between the third and fourth second of time it travels a distance of

34.3 m

A ball rolls up a slope. At the end of three seconds its velocity is 20 cm/s; at the end of eight seconds its velocity is 0. What is the average acceleration from the third to the eighth second?

4.0 cm/s^2

A racing car traveling with constant acceleration increases its speed from 10 m/s to 50 m/s over a distance of 60 m. How long does this take?

4.0 s

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The magnitude of the average speed of the car for this round trip is

50 km/hr

A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h. The average speed of the car for this 80-km trip is

53 km/hr

At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by -0.50t, in m/s^2 for t in seconds. At the end of 4.0 s it has traveled

59 m

An object starts from rest at the origin and moves along the x axis with a constant acceleration of 4 m/s^2. Its average velocity as it goes from x = 2 to x = 8 m is

6 m/s

A stone is released from rest from the edge of a building roof 190 m above the ground. Neglecting air resistance, the speed of the stone, just before striking the ground, is

61 m/s

An object dropped from the window of a tall building hits the ground in 12.0 s. If its acceleration is 9.80 m/s^2, the height of the window above the ground is

706

At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by -0.50t, in m/s^2 for t in seconds. It stops at t =

8.0 s

At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by -0.50t, in m/s^2 for t in seconds. By the time it stops it has traveled

85 m

Each of four particles move along an x axis. Their coordinates (in meters) as functions of time (in seconds) are given by particle 1: x(t)=3.5-2.7t^3 particle 2: x(t)=3.5+2.7t^3 particle 3: x(t)=3.5+2.7t^2 particle 4: x(t) = 3.5-3.4t-2.7t^2 Which of these particles is speeding up for t > 0?

All 4

A particle moves on the x-axis. If its acceleration is positive and increasing

None of the above

A feather, initially at rest, is released in a vacuum 12 m above the surface of the earth. Which of the following statements is correct?

The acceleration of the feather remains constant during the fall

Which one of the following statements is correct for an object released from rest?

The average velocity during the first second of time is 4.9 m/s

A drag racing car starts from rest at t = 0 and moves along a straight line with velocity given by v = bt^2, where b is a constant. The expression for the distance traveled by this car from its position at t = 0 is

bt^3/3

The coordinate-time graph of an object is a straight line with a positive slope. The object has

constant velocity

The area under a velocity-time graph represents

displacement

An object is thrown vertically upward with a certain initial velocity in a world where the acceleration due to gravity is 19.6 m/s^2. The height to which it rises is _____ that to which the object would rise if thrown upward with the same initial velocity on the Earth. Neglect friction.

half

Throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration might be

negative and negative, respectively

An object has a constant acceleration of 3 m/s^2. The coordinate versus time graph for this graph has a slope

that increases with time

The average speed of a moving object during a given interval of time is always

the distance covered during the time interval divided by the time interval

A freely falling body has a constant acceleration of 9.8 m/s^2. This means that

the speed of the body increases by 9.8 m/s during each second