How is the output of a machine calculated?

A 21 g bullet is accelerated in a rifle barrel 114 cm long to a speed of 1180 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N.

Which of the following is not used when prediciting volcanic erruptions A. earquake activity B. humidity C. temperature of volcanoe D. changes in volcanoes shape

What branch of science that deals with landforms, features, inhabitants and phenomena on earth

Two light bulbs are wired in series and one bulb burns out (opens.) Technician A says that the other bulb will still work.

Show that the Newton has the units of mass times acceleration.

A wave with a frequency of 30 Hz has a wavelength of 40.5 m. How fast is the wave traveling?

A soccer ball is sitting in the middle of a soccer field during a game. When the referee blows his whistle, one of the players runs toward the ball and kicks it as hard as he can.

A body with v=20m/s changes its speed to 28m/s in 2sec. its acceleration will be

Charge: A piece of plastic has a net charge of + 2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 * 10-19 C)

How much heat is needed to raise the temperature of 6g of water by 18oC?