The electric motor has an input energy of 50,000 joules each second. The motor transfers 35,000 joules of useful energy each second. Calculate the efficiency of the electric motor (show workig out too)

In comparison to radio waves, visible light has: A. wavelengths that are equal. B. frequencies that are equal. C. a speed that is faster. D. wavelengths that are shorter. E. wavelengths that are longer.

When asked how to create an electromagnet the best answer would be?

Sodium and phosphorus combine to form Na3P. The name of this compound is.

Determine the acceleration of a raptor that reaches 25 m/s from rest in 6.5 s.

If an object does not move, there is no work done? True or false?

The mass is increased by a factor of four. What is true about the period? Choose the best answer. The period remains unchanged. The period increases by a factor of four. The period is halved. The period doubles.

What does law of conservation of mass mean?

Why do substances with free electrons make the best conductors.

Which of the following is evidence that groundwater causes erosion and deposition?

Which project involved the goal of orbiting a manned spacecraft around earth? A. Mercury B. Apollo C. Gemini D. Skylab