A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?

When one continental plate slides beneath another A. weathering and erosion work to build high plateaus and mountain ranges. B. the process of melting returns material to the Earth's surface. C.

Order the sounds made by these sources from highest to lowest pitch. telephone, piano, motorcycle, lawn mower lawn mower, motorcycle, piano, telephone motorcycle, telephone, piano, lawn mower lawn mower, piano, telephone, motorcycle

Is the sun a transparent object

Bob rubs a piece of fur on a hand rubber rod, giving the rod a negative charge. what happens?

Which of the following areas would most likely have the deepest layer of topsoil?

A science class did an investigation to see how many breaths it took for each student to blow up a balloon. Jason blew up his balloon with the fewest breaths. Which of these might explain why Jason took fewer breaths to blow up his balloon? A.

How the behavior of waves is affected by a medium

Suppose the gravitational force between two spheres is 100 N. If the distance between the spheres is halved, what is the new gravitational force between them?

Why did the work of Rutherford and Marsden convince many scientists that the 'plum pudding' model of the atom was incorrect?

Current always returns to the: a) positive battery terminal b) negative battery terminal