Unit Test — Cumulative exam Answers

What is the horizontal acceleration of a ball that is launched horizontally with a velocity of 5.6 m/s?

A 2.5 kg block is launched along the ground by a spring with a spring constant of 56 N/m. The spring is initially compressed 0.75 m.

A car travels straight for 20 miles on a road that is 30° north of east. What is the east component of the car’s displacement to the nearest tenth of a mile?

Which statements describe the motion of a planet according to Kepler’s second law? Check all that apply.The speed of a planet varies as it moves in its orbit. The speed of a planet is constant as it moves in its orbit.A planet travels the same distance along its orbit in equal units of time.A planet sweeps out an equal area in equal units of time.A planet’s orbit is a circle centered on the Sun.A planet’s orbit is an ellipse with the Sun at one focus.

On an ice skating rink, a girl of mass 50 kg stands stationary, face to face with a boy of mass 80 kg. The children push off of one another, and the boy moves away with a velocity of +3 m/s.

Which is the best example of kinetic energy?

Which properties can be used to determine whether a substance is a liquid or a plasma? Check all that apply.the mass of the substancethe container of the substancethe charge of the substance’s particlesthe distance between the substance’s particlesthe compressibility of the substancethe color of the substance

What is the approximate tangential speed of an object orbiting Earth with a radius of 1.8 × 108 m and a period of 2.2 × 104 s?

Briana swings a ball on the end of a rope in a circle. The rope is 1.5 m long. The ball completes a full circle every 2.2 s.