Physics 1301 test 2 chapter 3 review

An object moves in a circular path at a constant speed. What is the relationship between the directions of the object's velocity and acceleration vectors?

The velocity and acceleration vectors are perpendicular.

A pool ball is rolling along a table with a constant velocity. The components of its velocity vector are vx=0.5m/s and vy=0.9m/s. Calculate the distance it travels in 0.3 s .

0.3m

A football player kicks a football in a field goal attempt. When the football reaches its maximum height, what is the relationship between the direction of the velocity and acceleration vectors? Assume air resistance is negligible.

At the maximum height, the velocity and acceleration vectors are perpendicular to each other.

Two balls are dropped from the top of the Leaning Tower of Pisa. The second ball is dropped a fraction of a second after the first ball. As they continue to accelerate to the ground, the distance between them will

Increase

Your boat departs from the bank of a river that has a swift current parallel to its banks. If you want to cross this river in the shortest amount of time, you should direct your boat

Perpendicular to the current.

At what angle, above the horizon, should a cannon be fired in order for the cannon ball to obtain the greatest horizontal range? Assume air resistance is negligible.

The cannon should be fired at an angle of 45° above the horizon.

For general projectile motion, which of the following best describes the horizontal component of a projectile's acceleration? Assume air resistance is negligible.

The horizontal component of a projectile's acceleration is zero.

For a projectile launched horizontally, which of the following best describes the horizontal component of a projectile's velocity? Assume air resistance is negligible.

The horizontal component of the projectile's velocity remains a nonzero constant.

A pilot releases a package from a plane flying horizontally at a constant speed. When the package reaches the ground below, what is the horizontal location of the plane with respect to the package? Assume air resistance is negligible.

The plane will be located directly above the package.

A player kicks a soccer ball in a high arc toward the opponent's goal. When the soccer ball reaches its maximum height, how does its speed at this point compare to its initial speed? Assume air resistance is negligible.

The speed at its highest point is less than its initial speed.

A swimmer is determined to cross a river that flows due south with a strong current. Initially, the swimmer is on the west bank desiring to reach a camp directly across the river on the opposite bank. In which direction should the swimmer head?

The swimmer should swim northeast.

A red water balloon is thrown horizontally from the top of a bridge. At the same instant, a yellow water balloon is dropped off the bridge from the same height. Compare the time of fall for the two balloons. Assume air resistance is negligible.

The two balloons hit the ground at the same time.

For general projectile motion, which of the following best describes the vertical component of a projectile's acceleration? Assume air resistance is negligible.

The vertical component of a projectile's acceleration remains a nonzero constant.

For a projectile launched horizontally, which of the following best describes the vertical component of a projectile's velocity? Assume air resistance is negligible.

The vertical component of the projectile's velocity continually increases.