Heat engine uses thermal energy flowing from a heat source that is 225 K to a cold sink that is 50 K. What is the approximate efficiency of the heat engine?

A small rock falling from the top of a 124-ft-tall building with an initial downward velocity of - 30 ft/sec is modeled by the equation h (t) = - 16t2 - 30t + 124, where t is the time in seconds.

Which of the following statements best explains why liquid water is NOT found on Jupiter? The gas on the planet causes the liquid to evaporate The temperatures are too hot so the liquid water vaporizes The planet lacks a solid surface and the

Which of these is an example of a velocity? A. 3km B. 2.5 m/s C. 8.9 km/h D. 35 cm/min up

1. Answer true or false to the following: A ball rolling on a flat table has a horizontal but no vertical component of motion. A rock falling straight downward with no wind blowing has no horizontal component of motion.

On Earth, water exists as a. a solid. c. a gas. b. a liquid. d. All of the above.

If the abosolute of a gas is 600 k, the temperature in degrees Celsius is

How does an electromagnetic wave propagate itself? a. A changing magnetic field induces an electric field perpendicular to the magnetic field. b. A changing electric field induces a magnetic field perpendicular to the electric field. c.

Which of the following is an example of convection? A. hot air rising and cooler air falling B. a hot object transferring heat to a cooler one C. a hot oven warming the air around it D. the rays of the Sun warming the earth

A 50,000 kg locomotive is traveling at 10 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? Assume the track is level.

A rectangular loop of wire with sides 0.262 and 0.401 m lies in a plane perpendicular to a constant magnetic field (see part a of the drawing). The magnetic field has a magnitude of 0.