A rock falls 30 m. Its KE before it strikes the ground is 4,392 J. What is the

mass of the rock?

A. 15 kg

B. 146 kg

C. 1.5 kg

D. 3.0 kg

In which of the following situation is work being done? A car is pushed but does not budge. A weightlifter holds a barbell over his head. A wagon is pulled at an angle of 30 degrees to the horizontal. A swimmer treads water for 15 minutes.

This is a form of winter precipitation. It is frozen precipitation falling as ice pellets. Snowflakes melt into raindrops as they pass through a thin layer of warmer air.

How do Newton's laws of motion apply to the motion of an animal, such as a cat that is running?

Which one of the following formulas is used to find the voltage of a circuit? A. E = I/R B. E = I2R C. E = R/I D. E = IR

All visible light (light that our eyes can detect) has wavelength between 400-700 nanometers. Wavelengths just smaller than 400 nm are Ultraviolet light. Wavelengths just larger than 700 nanometers are infrared light.

Halley's Comet appears around the sun about once every 76 years. It passes through the part of its orbit nearest the sun in just a few months but then moves out to great distances and takes more than half a century for the rest of its orbit.

In order to hike around a portion of Lake Allatoona, a tour guide determines that he must take his group 150 m east, 60 m north, then 75 m west.

Explain what happens to light when it is refracted at the surface of water.

A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct? (There could be more than one correct choice.

Consider the following distribution of objects: a 3.00-kg object with its center of gravity at (0, 0) m, a 4.20-kg object at (0, 6.00) m, and a 1.40-kg object at (1.00, 0) m. Where should a fourth object of mass 7.