Decreases efficiency by causing an energy loss to the environment

A. Mechanical advantage

B. Efficiency

C. Machine

D. Friction

Which family of elements is mostly non-reactive?

What is heat a measure of? A) kinetic energy B) potential energy C) thermal energy

An object has a total kinetic energy of 2,400,000 J. If it's mass is 0.004 kg, then what is it's velocity.

Through which element would someone most likely receive a shock

In an electrically neutral atom of any element, there are equal numbers of A) protons and neutrons. B) electrons and protons. C) electrons and neutrons. D) atomic number and atomic mass

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies