Look at the Sankey diagram for a petrol engine below. What is the engine's mechanical efficiency? Enter your answer as a number.

Mechanical
energy 80 MJ

Petrol
200 MJ

Heat 120 MJ

Rohit is trying to tune an instrument

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p

Current from a charged capacitor lights a bulb. as time goes on the brightness of the