Explain why the efficiency of a simple machine cannot excced 100%

Rosa records the distance that a toy car rolls and the time it takes to cover the distance. What scientific practice is this?

In a young's double-slit experiment, the angle that locates the second dark fringe on either side of the central bright fringe is 6.5 degrees. find the ratio d/λ of the slit separation d to the wavelength λ of the light.

A 50,000 kg locomotive is traveling at 10 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? Assume the track is level.

What changes occur at the molecular level when butter melts in a hot pan? A. the motion of the butter molecules remains the same B. the motion of the butter molecules increases C. the motion of the butter molecules decreases D.

Aristotle supported which of these views? The Sun and all the planets revolve around Earth. The speed of a free-falling object is independent of its weight. Earth and other planets revolve around the Sun.

How is Electric current able to flow?

In a series circuit, loads which have the same voltage dropped across them will have?.

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is