In the picture below, the 21 kg mass is attached by a cord to a mass hanging over the edge of the table. the frictional force between the mass and the table's surface is 121 n. the mass accelerates at a rate of 0.73 m/s^2 to the right. what is the weight of the hanging block?

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

If a simple machine reduces the strength of a force, what must be increased?