An engine takes in 200 J of heat, expels 40 J of heat, and does 160 J of work. What is the efficiency of the engine?

A. 40%

B. 60%

C. 80%

D. 20%

States that all matter is made of tiny particles that are in constant motion

All elements in a period have the same energy level due to which of the following reasons

The milky way galaxy is question 48 options: a spiral galaxy. part of a cluster of galaxies that contains a few dozen galaxies. about 80,000 light years in diameter. all of the above.

How can the net force on an object change the motion of the object

A golfer is on the edge of a 15 m bluff overlooking the 18th hole which is located 70 m from the base of the bluff. She launches a horizontal shot that lands in the hole on the fly. The gallery erupts in cheers.

What is the density of an unknown metal that has a mass of 158 g and a volume of 20 ml

An electron is located on the x axis at x0 = - 9.31*10-6 m. Find the magnitude and direction of the electric field at x = 9.39 * 10-6 m on the x axis due to this electron.

Earth attracts a person with a gravitational force of 7.0 * 102 newtons. What is the magnitude of the force with which the individual attracts Earth? 3.0 * 10² newtons 7.0 * 10² newtons 8.5 * 10² newtons 9.8 * 10² newtons

The productive cycle of a human is usually regulated by

Winston stands on the edge of a building's flat roof, 12 m above the ground, and throws a 147.0-g baseball straight down. the ball hits the ground at a speed of 18 m/s. what was the initial speed of the ball?