The velocity of a car changes from 20 m/s east to 5 m/s east in 5 seconds. What is the acceleration of the car?

A crate is dragged 4.0 m along a rough floor with a constant velocity by a worker applying a force of 400 N to a rope at an angle of 30∘ to the horizontal.

Example of something that stores chemical energy is?

A student calculates the potential energy of a roller coaster at the top of a hill. Then, she uses the kinetic energy equation to calculate the roller coaster's energy as it reaches the bottom of the hill.

Two of the three tuning forks have known frequencies. When a 610 Hz fork and the unknown fork are struck together, four beats per second are heard.

An electric iron is plugged into a receptacle that has 110 V present. If the voltage loss from the panel to the receptacle is 6 V, the line voltage at the panel is a. 116 V. b. 110 V. c. 120 V. d. 104 V.

What does it mean that a form of energy might take more energy to harness than it provides? Are renewable resources always renewable, or can they become non-renewable? Why aren't renewable resources used for everything that we use energy for?

What would a sound wave do if it traveled from a gas to a liquid? •stop •stay the same speed •slow down •speed up

A rock is thrown downward into a well that is 7.92 m deep. Part A If the splash is heard 1.17 seconds later, what was the initial speed of the rock? Take the speed of sound in the air to be 343 m/s.

Which drum would make a sound that fades away faster - one that makes a loud sound or one that makes a more mellow sound Why?

Which of the following is NOT a way to increase the solubility of a solid in water? A. crushing the solid B. shaking the mixture of solid and water C. raising the temperature of the water D. letting the mixture stand still a long time