Which simple machine is the lid of a jar? a lever a screw an inclined plane a wheel and axle

How did she change the circuit? She changed a short circuit to an open circuit. She changed an open circuit to a closed circuit. She changed a closed circuit to an open circuit. She changed a closed circuit to a short circuit.

What potential increase vac must an electron be accelerated through if the most energetic photon it can emit will scatter off of a stationary electron at an angle ϕ=60∘ with wavelength 8.

Select all that apply. In the future, scientists hope to: live underwater establish colonies in space breathe underwater using artificial gills continue encroaching on the oceans mine oil and other natural resources from the ocean floor

1) generators convert physical energy into? a. sound waves b. electrical energy c. batteries d. motors

How is momentum conserved when the big rolling ball hits the smaller rolling ball

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.