A heat engine has a temperature of 1800 K. Some of the heat from the engine flows to the surroundings, which are at a temperature of 160 K.

What is the approximate efficiency of the engine?

a. 16%

b. 91%

c. 103%

d. 109%

List 5 examples of Compressional Waves

I am the process by which rocks change over millions of years.

A person stands 6.00 m from a speaker and 8.00 m from an identical speaker. What is the frequency of the second (n=2) interference minimum (destructive) ? (unit=Hz) ?

Think about multiplying the mass of each student by a factor to calculate each student's kinetic energy. Is there a common factor that works for every student? If so, what's this factor?

After a package is dropped from the plane, how long will it take for it to reach sea level from the time it is dropped? assume that the package, like the plane, has an initial velocity of 342 km/hour in the horizontal direction.

Mohammed made a chart to list examples and nonexamples of projectile motion. Which best completes the chart? a - a football thrown in the airb - a kite flying on a stringc - a golf ball rolling off a table d - water spraying from a fountain

Halley's Comet appears around the sun about once every 76 years. It passes through the part of its orbit nearest the sun in just a few months but then moves out to great distances and takes more than half a century for the rest of its orbit.

In order to hike around a portion of Lake Allatoona, a tour guide determines that he must take his group 150 m east, 60 m north, then 75 m west.

Explain what happens to light when it is refracted at the surface of water.

A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct? (There could be more than one correct choice.