Voltage can be provided by

a. a battery.

b. a generator.

c. plugging in to an electrical outlet.

d. all of these can provide voltage.

When a person bends an arm a different muscle is used to bring it back to the original position. why can't the same muscle be used to both bend and unbend the arm?

Quentin made a table to summarize uses of electromagnetic waves. Which should he write in the "Use" section for X-rays? music broadcasts luggage inspections night-vision goggles digital photographs

Imagine you are a travel agent in the next century. an eccentric billionaire asks you to arrange a "guinness book of solar system records" kind of tour.

The frequency of a wave determines which of the following? loudness reflection energy pitch

A tennis ball is thrown upward from the top of a 680 foot high building at a speed of 56 feet per second. The tennis ball's height above ground can be modeled by the equation. When does the tennis ball hit the ground?

Which actions are evidence that a chemical reaction has occurred? Check all that apply. A: a change in color B: the formation of a precipitate C: a clear liquid becoming cloudy D: a change in shape E: the formation of bubbles F: the formation of

Which sphere forms Earth's outermost layer? Atmosphere Biosphere Cryosphere Hydrosphere

an 100kg object traveling at 50m/s collides (perfectly inelastic) with a 50kg object initially at rest. what is the sum of the momentum of both objects prior to the collision?

A train moves at constant velocity of 50km/h. how far will it move in 0.5h?

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion