Physics Unit Test

In the equation for centripetal force, which expression represents the centripetal acceleration of the object?

(v^2)/r

A cyclist rides at a constant speed of 4.5 m/s around a curve. If the centripetal acceleration is 29 m/s2, what is the radius of the curve?

0.70 m

If the distance between the asteroids is 2100 kilometers, what is the mass of asteroid Y?

1.1 × 10^16 kg

To the nearest whole number, how much would a 25.0 kg rock weigh on Uranus?

218 N

What is the tangential speed of the tire?

3.1 m/s

The orbital period of a satellite is 2 × 106 s and its total radius is 2.5 × 1012 m. The tangential speed of the satellite, written in standard notation, is:

7850000

Which statement accurately compares the mass and weight of an object on these two planets?

An object weighs about one-sixth as much but has the same mass on Pluto as on Mercury.

Rahul wants to change the motion map shown so that it shows uniform circular motion.

He should change the lengths of the vectors that point tangent to the circle so that each is the same length.

He wants to throw the pitch level with the ground and in the direction he is facing. At which point should he release the pitch?

W

Based on the map, at which point is the object accelerating toward the right?

Z

Which object is most likely represented by the dot?

a ball on a string that stopped at the top of a vertical loop

Which formula can be used to find the centripetal acceleration of an orbiting object?

a(c)=(v^2)/r

Which best explains how to correct Leo's diagram?

remove the Fair vector

In the equation for the gravitational force between two objects, what does G represent?

the gravitational constant

Cecelia dropped a ball from a height of 2 m. The ball fell in a straight path down to the ground.

tossing it horizontally at a faster speed