Why is the work output of any real machine less than the work needed to operate it?

work is gained due to friction

work is lost due to friction

friction reduces the work input

The air pressure in your tire is higher on a hot summer day. What is the independent variabl

What is the best description of sound waves? a. A source vibrates up and down, causing air molecules to move up and down perpendicular to the direction the wave is transmitted . b.

Specular reflection and diffuse reflection are concepts that can be applied to every room that you have ever been in. Describe how these concepts can be applied to your kitchen, bathroom, and bedroom.

If you were designing a room in a house, where would be the better place to put a heater, near the floor or near the ceiling? Why? Consider your answer in the context of convection. 1.

1. Answer true or false to the following: A ball rolling on a flat table has a horizontal but no vertical component of motion. A rock falling straight downward with no wind blowing has no horizontal component of motion.

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?