What are the disadvantages of friction? State at least 5 disadvantages.

Rank the following in order of decreasing angular speed: an automobile tire rotating at 2.00*103deg/s, an electric drill rotating at 400.0 rev/min, and an airplane propeller rotating at 40.0 rad/s.

The proton from the decay of the neutron is moving at 0.75 c. An observer on the proton measures the radius of the electron as 10 fermi. A Fermi is 10-15 m. What is the radius of the electron measured by someone on the electron?

Wha is amplitde in sound

when a boy plays a penalty kick he applies a force of 30N for a period of 0.05s. If the mass of the ball is 0.075KG, calculate the speed with which the ball move

A 4kg bird has 8 joules of kinetic energy, how fast is it flying?

As protostars continue to contract, their cores become hotter and more dense until what process begins ...

Emily jogs 3 laps at the track to warm up. She jogs at 5 mph. Then she runs 3 more laps at 7 mph. What is true about her average speed and her average velocity?

Which of the following elements are the most reactive? beryllium, calcium, magnesium, barium?

1.) State which definition of power below is correct. A.) the energy transferred per hour. B.) the energy transferred. C.) the energy transferred per second. D.) the force over a distance. 2.

Science and technology are closely related, but not the same. Which of the following is most likely a result of technology, not science?