If the engine receives 6.45 kJ of heat energy from the reservoir at 520 K in each cycle, how many joules per cycle does it reject to the reservoir at 300 K?

A hockey goalie is standing on ice. Another player fires a puck (m = 0.170 kg) at the goalie with a velocity of + 41.0 m/s. (a) If the goalie catches the puck with his glove in a time of 2.

An old door is very hard to open until oil is sprayed on its hinges. What does the oils do? A) It increases the force of friction B) It increases the force of gravity C) It reduces the force of gravity D) It reduces the force of friction

The orbital velocity of the Earth about the sun is 30 km/s. If the Earth were suddenly stopped in its tracks, it would simply fall radially into the sun.

How do you measure the amplitude of a longitudinal wave?

A 13,000 N car starts at rest and rolls down a hill froma height of 10 m. It then moves across a level surfaceand collides with a light spring-loaded guardrail.

An eagle carries a fish up 50 m into the sky using 90 n of force. how much work did the eagle do on the fish

Consider a steel guitar string of initial length l=1.00m and cross-sectional area a=0.500mm2. the young's modulus of the steel is y=2.0*1011n/m2.

What is the most advanced life form on earth

How do power plants generate electricity?

How much work would it take to move a coulomb charge across a 4 volt potential difference?