you can produce a sound by plucking a string or by blowing into a pipe. how are these two sounds different

Energy cannot be created or destroyed, so it must be ...

Electric current flows through a long rod generating thermal energy at a uniform volumetric rate of

What temperature is required to transfer waste heat to the environment for a heat engine to be 100 percent efficient? a) 0°C b) 0 K c) 273 K d) 212°F

under what conditions could the angular momentum of the closed system of isolared student, stool, and masses change

A net force of 3000 N is accelerating a 1200 kg elevator upward. If the elevator starts from rest, how long will it take to travel up 15 m?

What wave-like property of light causes it to bend when encountering an opening? A. Reflection B. all the above c. Refraction d. none of the above e. diffraction

Which of the following statements describe sliding friction? Select all that apply. 1.) a force that causes an object to increase speed 2.) a force in which one of the objects involved must be a liquid or a gas 3.

What do a broken rode and a volcano eruption have in common

What is the input of energy for a device that provides 50 units of useful energy and has an efficiency of 0.55?

All of the following shows density and buoyancy except: A. ice cubes floating in a glass of iced tea B. the amount of hot soup contained in a bowl C. a hot air balloon moving through the air D. a boulder resting at the bottom of the ocean