Explain a compression and a refraction of a sound wave traveling though the air

A 20 kg rock is perched atop a cliff that is 100 m high. What is its potential energy? A. 200,000 J B. 0.20 C. 2,000 u D. 19,600 J

What factor can increase the potential energy of an object? A Decrease in speed B Decrease in density C Increase in temperature D Increase in height from the ground?

Calculate the energy needed to change 10 grams of water from 70°C to 110°C.

In which tool are uranium atoms split to make electricity? A. turbine B. generator C. reactor D. condenser

When is the zebra in motion when it is not moving

The idea that life could spring from nonliving matter is called? a. development. b. homostasis. c. spontaneous generation. d. evolution. 20 PTS

Physics how to calculate disintegration energy

Fast flowing water wears down the surface of a rock. This is an example of mechanical weathering chemical weathering erosion molecular weathering

What current would it need to carry in order to experience a very modest 1.0*10-3n⋅m torque?

Which of the following is the most accurate statement concerning the properties of matter? a. they can be written as symbols b. they can be observed and measured c. they cannot be tested or verified d. they change with the amount of matter present