Unit Test — Unit test Answers

Which statements describe the relationship of Earth and its moon? Check all that apply.The moon orbits Earth following a nearly circular path.The gravitational pull of Earth on the moon is parallel to the velocity of the moon.The moon orbits Earth in 1 Earth day.The same face of the moon always points toward Earth.The moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from Earth.

The gravitational force between two objects is 45,000 N. What will be the gravitational force between the two objects if the distance between the objects is reduced by one-half?

What are possible formulas for impulse? Check all that apply.J = FtJ = J = FvJ = J = mvJ = p

If it takes a planet 2.8 × 108 s to orbit a star with a mass of 6.2 × 1030 kg, what is the average distance between the planet and the star?

How high above Earth is a satellite orbiting if its tangential velocity is 5000 m/s? Earth’s mass is kg and its radius is m.

A ball has a mass of 0.25 kg and is moving to the right at 1.0 m/s. It hits a ball of mass 0.15 kg that is initially at rest. After the collision, the 0.15 kg ball moves off to the right with a velocity of 0.75 m/s.

What type of relationship exists between momentum and mass?

A remote-controlled plane has a mass of 0.386 kg and flies in a circle with a radius of 75 m. The centripetal force on the plane is 4.0 N.

Which formulas show the relationships between momentum, mass, and velocity? Check all that apply.p = mvp = p = m = p = v = v =

Which cars have the same magnitude of momentum? Check all that apply.

The universal law of gravitation states that the force of attraction between two objects depends on which quantities?

Students are completing a lab in which they let a lab cart roll down a ramp. The students record the mass of the cart, the height of the ramp, and the velocity at the bottom of the ramp. The students then calculate the momentum of the cart at the bottom of the ramp.Which trial’s cart has the greatest momentum at the bottom of the ramp?

The solar mass of the Sun is 1. The orbital period of Jupiter is 11.9 Earth years.

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What causes a satellite to move tangentially to a circular path?

Two blocks are initially at rest with a compressed spring between them. When the spring is released, the 2m block moves to the left and the m block moves to the right. This represents an inelastic collision in a closed system.

What is the direction of the centripetal force when applied to an object?

Dewayne reviews Kepler’s laws by making the table shown. Which label belongs in each cell of the table?

Phobos orbits Mars in 27,553 s at a distance of 9.378 × 106 m. What is the mass of Mars?