Why is the efficiency of a machine always less than 100 percent

What is universal laws of gravitation

Formation of a precipitate is usually evidence of? the separation of a mixture, a chemical change, formation of a mixture, physical change

A glass window 0.33 cm thick measures 87 cm by 36 cm. How much heat flows through this window per minute if the inside and outside temperatures differ by 14°C? Express your answer using two significant figures.

Which of the following displays a noncontact force? a. Opening a door b. Hitting a golf ball onto a fairway c. Typing on a keyboard d. Two magnets pulling toward one another

What is the effect on an electric current when the voltage is increased? An increase in voltage causes the flow of electric current to

An object of mass 10 kg is accelerated upward at 2 m/s squared. what force is required?

How much work does a supermarket checkout attendant do on a can of soup he pushes 0.600 m horizontally with a force of 5.00 N? Express your answer in joules and kilocalories.

Arrange the objects in order from least to greatest potential energy. Assume that gravity is constant. (Use PE = m * g * h.

No physical processes have ever been demonstrated which provide a mechanism for the universe to assemble itself. True False

A very famous motorcyclist plans to jump across a canyon 3.5 kilometers wide. he plans to use a 30 degree ramp and leaves it at 196 m/s. Will he make it? show all calculations to prove your answer