Energy conservation means

a. slowing down a chemical change.

b. burning a fuel to release energy.

c. using fossil fuels to produce electricity.

d. reducing energy use.

Which best describes the materials that make up an electrical cord? 1. a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons 2.

F 600 J of work is done in 3 s, what is the power? (Power: P = W/t) 0.005 W 200 W 603 W 1800 W

What is the average speed, over the first 3.0 s of its motion, of a pebble released from rest off a bridge?

Which following is true off free falling object of different mass A. they have the same acceleration but different g value B. they have the same g value but different acceleration C. they experience the same force of gravity D.

A spring-loaded dart gun is compressed a distance d, then fired straight up into the air. The dart reaches a maximum height of 24 m. For a second trial, the spring is compressed a distance of 0.50d.

The Yerkes refracting telescope has a 1.00 m diameter objective lens of focal length 20.0 m. Assume it is used with an eyepiece of focal length 2.50 cm. (a) Determine the angular magnification of the planet Mars through this telescope.

A small kid sits on a bike (Anita). A bigger and stronger person (Jamy) pushing the kid so that the kid starts speeding up. (neglect friction). Mark all correct statements about the forces between them. A.

A ___ is awarded to the opposing team when that team violently or dangerously charges a opponent. (in soccer) A) Goalie kick B) Indirect kick C) Direct kick D) Throw in

Which has greater potential energy, a book on the top shelf of a bookcase or a book on the bottom shelf? Why?

Fusion occurs with atoms of elements less massive than a. iron. b. helium. c. calcium. d. uranium.