A window washer stands on a scaffolding 30 meters above the ground. If he did 23,520 joules of work to reach the scaffolding what is his mass

True or false surface tension is a property of gases

Which class of elements is most effective at conducting electricity and heat

An uncharged metal sphere, A, is on an insulating base. A second sphere, B, of the same size, shape, and material carrying charge Q is brought close to, but not touching, sphere A.

What is the energy of a photon with a frequency of 3.6 * 1015 Hz? Planck's constant is 6.63 * 10-34 J•s.

What is an extrasolar planet? a. A planet that is considered an "extra," in that it was not needed for the formation of its solar system. b. A planet that is extra large compared to what we'd expect. c. A planet that is larger than the Sun. d.

A standing wave is established in an organ pipe that is closed at one end. What is located at the open and closed ends of the pipe?

When all parts of a circuit are composed of conducting materials, the circuit is said to be A. parallel. B. closed. C. open. D. shorted.

You travel an an average speed of 20 km/h in a straight line to get to your grandmothers house. It takes you 3 hours to get to her house. How far away is her house from where you started?

A boat with an anchor on board floats in a swimming pool that is somewhat wider than the boat. Does the pool water level move up, move down, or remain the same if the anchor is (a) dropped into the water or (b) thrown onto the surrounding ground

In July 2005, NASA's "Deep Impact" mission crashed a 372-kg probe directly onto the surface of the comet Tempel 1, hitting the surface at 37,000 km/h.