Physics Berg chap3

If a car accelerates at a uniform 4.0 m/s squared, how long will it take to reach a speed of 80 km/hr, starting from rest?

5.6 s

A jet plane is launched from a catapult on an aircraft carrier. in 2.0 s it reaches a speed of 42 m/s at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2.0s?

42m

An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s squared. It travels a distance of 1.033 km while accelerating. How many seconds did it take to travel the 1.033 km?

45 s

A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s squared for 15 s. At the end of this time, what is its velocity?

45m/s

An object is moving with constant non-zero acceleration in the +x direction. the velocity versus time graph of this object is

A straight line making an angle with the time axis

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s squared. How long after beginning to accelerate does it take the car to move 3.50 km?

1.00*10squared seconds

A certain test car can go from rest to 32.0 m/s in 3.88 s. The same car can come to a full stop from that speed in 4.14 s. What is the ratio of the magnitude of the starting acceleration to the stopping acceleration?

1.07

In a ballistics test, a bullet moving horizontally with a a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm.what is the magnitude of the average acceleration of the bullet in the sandbag?

1.25*10 to the sixth m/s squared

A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.

0.30 m/s squared, south

In a ballistics test, a bullet moving horizontally with a a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. how many milliseconds does it take the bullet to come to rest in the sandbag?

0.400 ms

A cart starts from rest and accelerates uniformly at 4.0 m/s squared for 5.0 s.. It next maintains the velocity it has reached for 10 s. Then it slows down at a steady rate of 2.0 m/s squared for 4.0 s. What is the final speed of the car?

12 m/s

A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. What is its average acceleration?

1500 m/s squared

A raquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 m/s. What is the average acceleration of the ball during the collision with the wall?

2800 m/s squared

The captain orders his starship to accelerate from rest at a rate of "1g" (1g=9.8 m/s squared). How many days does it take the starship to reach 10 % the speed of light? (Light travels at 3.0*10 to the eighth m/s)

35 days

An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s squared. It travels a distance of 1.033 km while accelerating.how fast is the auto moving just as it traveled the 1.033 km?

39 m/s

An airplane increases its speed at the average rate of 15 m/s squared. How much time does it take to increase its speed from 100 m/s to 160 m/s?

4.0 seconds

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s squared. How much time is required for the car to reach a speed of 90 km/hr?

4.2 s

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s squared. How fast is the car moving just as it has traveled 3.50 km?

62.5 m/s

A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s squared to the right. What is the cart's displacement during the first 6.0 s of this motion?

66 m

An object is moving with constant non-zero acceleration in the +x direction. The position versus time graph of this object is a

A parabolic curve

The slope of a velocity versus time graph gives

Acceleration

The following situation is impossible

An object has constant non-zero velocity and changing acceleration

If the position versus time graph of an object is a horizontal line, the object is

At rest

An auto manufacturer advertises that their car can go from zero to sixty in eight seconds. This is a description of what characteristic of the car's motion?

Average acceleration

A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start. The car reaches a speed of 140 km/hr as it passes marker 2. Where on the track was the car when it was traveling half this speed?

Before marker 1

When a ball is thrown straight up with no air resistance, the acceleration at its highest point is

Downward

Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point.

Exactly g

If the acceleration of an object is zero, then that object cannot be moving, true or false

False

If the velocity of an object is zero at some point, then it's acceleration must also be zero at that point. True or false

False

If the velocity of an object is zero, then that object cannot be accelerating. True or false

False

Two objects are dropped form a bridge, an interval of 1.0s apart. Air resistance is negligible. During the time that both objects continue to fall their seperation...

Increases

An object moving in the +x direction experiences an acceleration of +2.0 m/s squared. This means the object

Is increasing its velocity by 2.0 m/s every second

A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration of the ball as it is going

It's velocity points upward and its acceleration points downward.

Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.

It's. Acceleration is in the -x direction

A ball is thrown downward in the absence of air resistance. After it has been released, make a statement concerning it's acceleration.

Its acceleration is constant.

Suppose a car traveling to the west (-x directions) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.

Its acceleration is positive.

If the velocity versus time graph of an object is a straight line making an angle of +30 degrees (counter clockwise) with the time axis, the object is

Moving with constant non-zero acceleration

If the velocity versus time graph of an object is a horizontal line, the object is

Moving with zero acceleration

If the velocity versus time graph of an object is a straight line making an angle of +30 degrees (counter clockwise) with the time axis, the object is

Moving with. Constant non-zero acceleration

Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds

Remains constant

A 10-kg rock and a 20-kg rock are dropped from the same height and experience no significant air resistance. If this takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?

T

Under what condition is average velocity equal to the average of the object's initial and final velocity?

The acceleration is constant

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Make a statement about this rock while it is in the air.

The acceleration is downward at all points in the motion.

Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration.

The acceleration is equal to zero.

Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. This statement about its acceleration is correct.

The acceleration is toward the east.

From the edge of a roof top you toss a green ball upwards with initial seed v0 and ablue ball downwards with the same initial speed. Air resistance is negligible. when they reach the ground below

The two balls will have the same speed.

Brick A is dropped from the top of a building, Brick B is thrown straight down from the same building and neither experience air restance. Make a statement about their acceleration.

The two bricks have exactly the same acceleration.

Two objects are thrown from the top of a tall building. One is thrown up and the other is thrown down, boh with the same initial speed. What are their speeds when they hit the street. neglect air resistance.

They are traveling at the same speed.

The slope of a position versus time graph gives

Velocity

A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?

a

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v0 and experience no significant air resistance. if the 10-kg rock reaches a maximum height h, what maximum height will the 20-kg ball reach?

h