Unit Test Review for physics
Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?
velocity and displacement
A child on a spinning ride at a playground has a centripetal acceleration of 0.80 m/s2. The child completes a full circle every 4.2 s. How far from the center of the ride is the child?
0.36 m
Which statement is supported by Kepler's laws?
The closer a planet is to the Sun, the faster it moves
Which is a correct description of Hooke's law?
The force applied to a spring equals the product of the spring constant and the displacement.
An object moving in a circle is represented by the motion map. Based on the map, at which point is the object accelerating toward the right?
Z
The gravitational force between two asteroids is 6.2 × 108 N. Asteroid Y has three times the mass of asteroid Z. If the distance between the asteroids is 2100 kilometers, what is the mass of asteroid Y?
1.1 × 1016 kg
The pitcher on a softball team starts a windup to throw a pitch, as shown. 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
Leo drew a force diagram to represent a satellite in orbit around Earth. 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. According to Newton's universal law of gravitation, which would change the path of the ball so it traces out the widest curved path possible?
tossing it horizontally at a faster speed
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
7,850,000 m/s.
The acceleration due to gravity on Mercury is 3.7 m/s2, which is about six times the acceleration due to gravity on Pluto. 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.
What did Johannes Kepler contribute to the study of planets?
He provided mathematical support for the heliocentric model.
Rahul wants to change the motion map shown so that it shows uniform circular motion. What change should Rahul make?
He should change the lengths of the vectors that point tangent to the circle so that each is the same length.
Which formula can be used to find the centripetal acceleration of an orbiting object?
ac = v2/r