What is the frequency of an electromagnetic wave with a wavelength of 20cm?

Which term identifies a scalar quantity? (1) displacement (3) velocity (2) momentum (4) time

Within the metric system all units are based on the number a. 1. b. 100. c. 10. d. 1000. The main difference between speed and velocity involves a. gravity. b. direction. c. distance. d. weight.

The critical angle for total internal reflection at the boundary between an unknown substance and air is 24.4°. what is the angle of refraction in the air if light is incident on the boundary at an angle of 20.0°?

Which changes would cause an increase in the resistance of a wire? Check all letters that apply. a) increasing its temperature b) decreasing its temperature c) using a longer wire d) using a shorter wire e) using a thicker wire using a thinner wire

A - 4.0-µC charge is located 0.45 m to the left of a + 6.0-µC charge. What is the magnitude and direction (to the right or to the left) of the electrostatic force on the positive charge?

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy

When a gas in a container is squeezed to half its volume, its density?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?

Which has more gravitational potential energy - - a cliff diver at the top of the cliff or a cliff diver at the bottom of the cliff?