A heat engine has a thermal efficiency of 45%. how much power does the engine produce when heat is transferred into it at a rate of 109 kj/hr?

Im doing the BIg Bang for my project anyone know what it is, make it a ¨question¨ and an experiment.

Do electromagnetic waves travel through a medium

Which of the following is a way that microwaves and x-rays are similar? A. They both have technological uses. B. They are both high energy waves, C. They are both to be exposed to at high doses. D. They are both used to transmit information.

Why does the earth rotate

Sound waves can't travel through a. a solid. b. an elastic material. c. a vacuum. d. a liquid.

You slide a box of books at constant speed up a 30° ramp, applying a force of 200 n directed up the slope. the coefficient of sliding friction is 0.18.

Two trains leave the same station at the same time. The first train travels north at 60 mph. The second train travels west at 45 mph. Find how fast the distance between the trains is changing two hours after the trains have left.

If the room radius is 4.5 m, and the rotation frequency is 0.8 revolutions per second when the floor drops out, what is the minimum coefficient of static friction so that the people will not slip down?

Energy of motion is known as what energy

While a constant total force of 17 n is exerted on a cart, the cart's acceleration is 5 m/s2. find the mass of the cart?