Mechanics | Relativity Answers

A 33 kg gun is standing on a frictionless surface. The gun fires a 55.7 g bullet with a muzzle velocity of 318 m/s. The positive direction is that of the bullet. Calculate the momentum of the gun immediately after the gun was fired

A motorist drives south at 28.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.40 min, and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.40 min trip, find the following values. Let the positive x axis point east.

(a) total vector displacement
m (magnitude) ° south of west

(b) average speed
m/s

(c) average velocity
m/s (magnitude) ° south of west

where from the satellite gets force for its motion? explain the condition for good satellite communication.

prove that the motion of a simple pendulum is simple harmonic motion. also show that the time period of simple pendulum of very large length is independent of length.

A 0.25 m diameter grinding wheel rotates at 2500 rpm. Calculate it's angular velocity in rad/s.

A boat is going across a river at 15 m/s in an easterly direction. The river currant flows north at 4 m/s. Report the magnitude of the velocity.

An object of mass 3 kg is moving on a rough surface with a velocity of 16m/s .It covers a distance of a of 20m before coming to rest.find the the opposing force.

A constant force of 39.1 N, directed at 27.5° from horizontal, pulls a mass of 12.3 kg horizontally a distance of 3.01 m. Calculate the work done by the force.

A 54.8-kg baseball pitching machine is placed on a frozen pond. It fires a 0.133-kg baseball at an angle of 30 degrees with the vertical at a speed of 18.5 m/s. What is the recoil velocity (in cm/s) of the machine?

A 27.6-g object moving to the right with a speed of 23.9 cm/s overtakes and collides elastically with a 18.1-g object moving in the same direction with a speed of 14.9 cm/s. Find the velocity (in cm/s) of 18.1-g object after the collision.