A Carnot engine takes 3000 J from a reservoir at 600 K, does some work, and discards some heat to a reservoir at 300 K. What is its efficiency?

50%

60%

20%

30%

Assume that the sun is a sphere of radius 6.96 * 10⁸ m and that its surface temperature is 5.8 * 10³ K. If the sun radiates at a rate of 3.90 * 10²⁶ W and is a perfect emitter, at what rate is energy emitted per square meter at the sun's surface?

A 50g ball is falling down. As the ball passes a certain distance its potential energy changes for 2J. Calculate this distance. Does this distance depend on the initial velocity of the ball?

To make a bounce pass, a player throws a 0.60-kg basketball toward the floor. The ball hits the floor with a speed of 5.4 m/s at an angle of 65° to the vertical.

Why do objects appear to be bent when partially submerged under water?

Why are so many large optical telescopes located on mountaintops

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

The ability of an object to vibrate by absorbing energy at its natural frequency is called?

A hurricane in the Gulf of Mexico to 15 hours to travel 360 kilometers. What is the average speed of this hurricane in kilometers per hour?

Which organization functions to privide clinics and surgeries i developing nations

What role do convection currents play in oceans and the atmosphere?