What is the efficiency of the

machine if the input is 263 J and

the output is 142 J?

Which of the following has the greatest magnitude? 30 Newtons 1 Newton . 10 Newtons

Which of the following statements about ice melting is true and why? A. Energy flows from the ice to its surroundings. B. Water molecules move from their fixed position. C. Water molecules lose energy. D.

Which would have more friction, a car traveling down a street or a toy remote-control car traveling on the same street? Why?

Which list of factors best supports the concept that they are "just right" for the planet earth to support life?

Which device is using a motor? A water heater creates heat energy from electric energy. A waterfall rotates a waterwheel to turn an axle A body massager uses electric energy to move back and forth.

Match the following. 1. energy a push or a pull 2. mechanical energy energy of a moving object 3. kinetic energy a force directed away from an object 4. heat the ability to do work 5. work a force moving an object through a distance 6.

Scientists hypothesize that oxygen began to accumulate in earth's atmosphere of living things with the ability to?

The 3 stages of the water cycle are

What is the main natural force responsible for mass movement of rocks and debris?

In a mass spectrometer, a specific velocity can be selected from a distribution by injecting charged particles between a set of plates with a constant electric field between them and a magnetic field across them (perpendicular to the direction of