Mechanics | Relativity Answers

An athlete runs at a velocity of 18m\s due East. A strong wind travelling at 8m\s blows 230° against him. Find the resultant vector using triangle of vectors

Would a basket hanging from 3 equally spaced points above the circumference still swing when forces are applied ( as opposed to bringing the three to one common point of suspension)

A 41.2-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2.40 m/s. Her hands are in contact with the wall for 0.535 s. Ignore friction and wind resistance. Find the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her). Note that this force has direction, which you should indicate with the sign of your answer.

1. Water is flowing at a speed of 2ms^-1 in a pipe of cross sectional area 0.02m^2 at point 1. If the cross sectional area is reduced to half at point 2, find the velocity at point 2.

A point mass is oscillating due to a restoring force. The amplitude of its oscillation is 0.2 m and the force constant is 100 Nm−1 . What is the total energy of the system?

A small body rolls horizontally of the edge of the table top which is 1.20 m high. It strikes at the floor at point 1.52 m horizontally from the table edge.

a.) How long is the ball in the air?
b.) What is its speed at the instant it leaves the table?

An electron is doubled from .2c to .4c.By what ratio does it's momentum increease?(b)What happens to the momentum ratio when the electron speed is doubled again from 0.4c to 0.8c.

If a motorcycle is traveling at 45mph and begins to slide 18 ft before hitting a parked vehicle, how far will the occupants travel before they land once ejected from the motorcycle?

find the frequency of a photon whose energy is 4.135*10'5ev.

A cheetah moving with constant acceleration covers the distance between two points 85.5 m apart in 9.5 s. It s speed as it passes the second point is 16 m/s.What is it s speed at the first point? what is its acceleration?