When is an element neutral?

The energy provided each hour by heat to the turbine in an electric power plant is 9.0*10^12 J. If 5.4 * 10^12 J of energy is exhausted each hour from the engine as heat, what is the efficiency of this heat engine?

what happens when tectonic plates move away from each other? A. molten matter cools and sinks towards the core B. lava travels way from the crust and forms the mantle C. molten matter seeps through crust and forms new land D.

Blocks A (mass 4.00 kg) and B (mass 6.00 kg) move on a frictionless, horizontal surface. Initially, block B is at rest and block A is moving toward it at 5.00 m/s. The blocks are equipped with ideal spring bumpers.

The first weightlifter is able to lift a weight equal to 2000N in 2 seconds The second weightlifter is able to lift a weight equal to 4000N in 2 seconds Q: which weightlifter is more powerful? Q: Why is the second more powerful?

If there is no outside force acting on an object that is in motion, can its motion change? Will it stop? Explain your answer.

A capacitor is connected to a power source and begins charging. What causes the capacitor to stop charging while it is still connected to the power source?

Do the data for the second part of the experiment support or refute the second hypothesis? Be sure to explain your answer

The capacitance of a parallel-plate capacitor does not depend on: area of the plates medium between the plates distance between the plates the material of which the plates are made

Which sequence lists types of material in order from least conductive to most conductive

Spectrum is Latin for which word? A. appearance B. scale C. range D. spread