Imagine a Carnot engine has a hot reservoir of 680 K and a cold reservoir of 220 K. What is the efficiency of the engine?

A novelty golf ball of mass m is launched with an initial velocity v0 = (25i + 13j) m/s and then follows a parabolic trajectory. At the top of the ball's trajectory, it explodes into two fragments A and B.

An object's motion changes A. only when a nonzero net force is applied to the object. B. only if the object is at rest when a force acts upon it. C. when the forces acting on the object remain balanced. D. when there are no forces acting upon it.

What is always true of a single-displacement reaction?

An aircraft is in a steady level turn at a flight speed of 200 ft/s and a turn rate about the local vertical of 5 deg/s. Thrust frm the engine is along the flight direction.

A tank originally contains 100 gal of fresh water. Then water containing 1/2 lb of salt per gallon is poured into the tank at a rate of 2 gal/min, and the mixture is allowed to leave at the same rate.

When you drop a pebble from height h, it reaches the ground with kinetic energy k if there is no air resistance. from what height should you drop it so it will reach the ground with twice as much kinetic energy?

Explain two ways that technology has had a positive impact on the environment and two ways that it has had a negative impact on the environment.

A rockets initially at rest, it steady gains speed at a rate of 10m/s^2 for 4.6s during take off. What was the rocket's top speed?

What do you mean by kintic theory of matter

What do u think is the smallest piece that you could break sand into