How do you know that aliens don't exist

Which statement about conduction is true? 1. Conduction uses electromagnetic waves. 2. Conduction transfers energy from one particle to another 3. Conduction from a fireplace can heat an entire room.

A - Your electrical bill last month was 790 kWh for 30 days of power. If coal was the only source of electricity for your house, how much coal (burned with 30% efficiency) does 790 kWh equate to?

When comparing two circuits, you note that circuit one has twice the resistance and half the voltage of circuit two. this means that both circuits will have the same current. both circuits will have alternating current.

A test tube of length L and cross-sectional area A is submerged in water with the open end down so that the edge of the tube is a distance h below the surface. The water goes up into the tube so its height inside the tube is l. l.

How would you best define moving charges

8. A force of 80 pounds on a rope is used to pull a box up a ramp inclined at 100 from the horizontal. The rope forms an angle of 330 with the horizontal. How much work is done pulling the box 25 feet along the ramp?

A raindrop has a mass of 5.4 * 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.

As an astronaut travels towards Earth, her weight A. decreases because gravity decreases. B. decreases because her mass decreases. C. increases because gravity increases. D. remains the same because her mass remains the same.

Lightning often strikes water. a. True b. False

How much work must be done on a 10 kg snowboard to increase its speed from 4 m/s to 6 m/s?