A machine has an efficiency of 70%. How much work dose the machine do when 20,000 J of work is done on it?

Electron affinity is a measure of an atom's ability to gain electrons. Predict the trend for electron affinity across a period. Explain your answer.

Which triangle side lengths form a right triangle? Choose all that apply. A. 5,6,7 B. 6,8,14 C. 8,15,17 D. 10,12,15 E. 15,20,25 F. 16,18,20

Why might learning of the vastness of outer space affect how people see themselves?

How do the areas of sunlight in the two hemisphere change over the year?

What do scalars measure force acceleration magnitude velocity

How does kinetic energy connect or relate to Newtons second law of motion?

In the United States, the electricity generated by hydropower is about a. twice that generated by solar and geothermal. b. equal to that generated using wind technologies. c. twice as much as that generated by wind, solar, and geothermal. d.

An ac generator consists of a coil with 40 turns of wire, each with an area of 0.06 m2. The coil rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 55Hz. What is the maximum induced emf?

The diagram shows the directions of the earth's rotation and the moon's orbit around the earth. Which of these phenomena occurs on earth because of this?

Which layer of the atmosphere is made up of charged atoms?