Explain why machine can"t be

100% efficient practically?

Ball 1, with a mass of 10kg, is moving to the right at 20m/s. Ball 2 is moving to the left at 20 m/s. Upon collision, ball 2 comes to a standstill, and ball 1 moves to the left at twice its original speed. What is the mass of Ball 2?

What statement is not true when two neutrons are added to oxygen-16.? . A) the oxygen atom becomes an isotope B) the charge of the oxygen atom changes C) the mass of the oxygen atom increases D) the mass of the oxygen nucleus increases

Which of these is NOT an example of acceleration? A. moving at 20 m/s in a circle B. speeding up from 5 m/s to 10 m/s C. slowing down from 10 km/h to 5 km/h D. moving at a constant speed of 150 km/h

What are protons and neutrons compromised of?

The proper way to brake in an emergency situation with non-ABS brakes is to: (A) apply threshold braking (B) "pump" the brakes (C) lock the brakes (D) All of the above

A standing wave is established in an organ pipe that is closed at one end. What is located at the open and closed ends of the pipe?

When all parts of a circuit are composed of conducting materials, the circuit is said to be A. parallel. B. closed. C. open. D. shorted.

You travel an an average speed of 20 km/h in a straight line to get to your grandmothers house. It takes you 3 hours to get to her house. How far away is her house from where you started?

A boat with an anchor on board floats in a swimming pool that is somewhat wider than the boat. Does the pool water level move up, move down, or remain the same if the anchor is (a) dropped into the water or (b) thrown onto the surrounding ground

In July 2005, NASA's "Deep Impact" mission crashed a 372-kg probe directly onto the surface of the comet Tempel 1, hitting the surface at 37,000 km/h.