Zach is making a round trip going from home to work. To get to her work she goes 30 m/s and then to get back home she goes 50 m/s. What is the velocityof Zach for the entire round trip? a. 0 m/s b.-20 m/s c. 80 m/s

As Luke rides his bike down a hill, potential energy is converted to kinetic energy. What is this an example of? A. Law of universal gravitation B. Theory of relativity C. Theory of momentum D. Law of conservation of energy

If a ride at disneyworld goes from rest to 27 m/s in 2.8 seconds and the mass of the ride and riders together 5000kg. What is the average power required to do this? Give your answers in both watts and horsepower

We place a small pressure sensor at a certain depth in water. with which orientation does the sensor register the greatest pressure, or is the reading the same in all directions?

What natural processes can shape rock in such a curious way

Approximately how much of an atoms mass is located in its nucleus? A. less than 1% B. 25% C. 75% D. over 99%

When air pressure is lower what happens to a balloon filled with air

Determine the power input for a motor necessary to lift 300 lb at a constant rate of 7 ft/s. the efficiency of the motor is ϵ = 0.65.

The thermal contact resistance at the interface of two 1-cm thick copper plates is measured to be 0.000056 m2K/W.

A provides resistance in an electric circuit. a. wire b. light bulb c. switch. d. battry

Why is it good for scientist to be skeptical