What is a trains average speed if it travels 225 kilometers in 2.5 hours

Suppose you put in 100 j of work on a lever and get out 93 j of work. what is the efficiency of the lever and how much of the work input is lost as heat in joules?

According to Newton's third law, what is likely to happen if you attempt to jump horizontally from a small boat to the dock before the boat is securely tied up? A. The boat will sink from being pushed down. B.

Which object has the greatest inertia? * 6-kg bag of feathers 5-kg rock 8-kg bowling ball 7-kg bag of groceries

What force is required to give an object with mass 50 kg an acceleration of 8 m/s2?

A jet plane leaves the stratosphere and returns to the ground. How does the temperature outside the jet change during its descent through the troposphere? A. It decreases and then increases. B. It decreases steadily. C. It increases steadily. D.

What is the basic unit of each type of elements

White light is composed of all the colors of the visible light spectrum. The spectrum is usually said to consist of A) red, blue and green B) red, yellow, blue and green C) red, orange yellow, green, and blue D) red, orange yellow, green, blue, and

What did Ernest Reuther fourths gold foil experiment show about the nature of Atoms

A student pushes on a 20.0 kg box with a force of 50 N at an angle of 30° below the horizontal. The box accelerates at a rate of 0.5 m/s2. What is the value of the friction force on the box? 200 N 50 N 43 N 33 N

How does the kinetic energy of particles vary with temperature