Mechanics | Relativity Answers

Sean (mass 80 kg) fires a twelve gauge 00 buckshoot which has a mass of 510g. His shot-gun has a mass of 5 kg. The muzzle velocity is 347 m.s-1. With what velocity does Sean (and his gun) recoil

A football coach starts at the 50
-yard line (A) and walks to the 10-yard line (B). He turns around and walks to the 40-yard line (C). He turns around again and walks back to the 0-yard line (D). He turns around once more and walks back to the 30-yard line (E), thus completing his 10 minutes of pacing. The coaches average velocity is.....

A bowling ball that has an 11-cm radius and a 7.2-kg mass is rolling without slipping at 2.0 m/s on a horizontal ball return. It continues to roll without slipping up a hill to a height h before momentarily coming to rest and then rolling back down the hill. Model the bowling ball as a uniform sphere and find h.

A force of 80 N is applied by an Elec student on the handle of a fliers held at 40º angle with the table. What horizontal force is pushing the fliers on the wire during splicing? *

A toy cannon uses a spring to project a 5.38-g soft rubber ball. The spring is originally compressed by 5.08 cm and has a force constant of 8.05 N/m. When the cannon is fired, the ball moves 14.9 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.032 2 N on the ball.
(a) With what speed does the projectile leave the barrel of the cannon?
(b) At what point does the ball have maximum speed? cm (from its original position)
(c) What is this maximum speed?

You cling to a rope tied to the ceiling of an elevator. (That means you hold on to a rope above you and yourfeet do not touch the oor.)When the elevator accelerates upward at 0.5 meters per second squared, the tension in the rope is 682 N. Whatis your mass? You may assume the rope is massless. Put the answer in kg.

A 120 kg piano is at the top of a ramp that makes an angle of 30° with the level ground. As the piano slides down the ramp it experiences a force of friction. The coefficient of kinetic friction is 0.10.

Question 1: A 120 kg piano is at the top of a ramp that makes an angle of 30° with the level ground. As the piano slides down the ramp it experiences a force of friction. The coefficient of kinetic friction is 0.10.

Draw free body diagram that represents the forces acting on the piano.
Determine the magnitude of the normal force acting on the piano.
Determine the magnitude of the kinetic force of friction acting on the piano.
Determine the acceleration of the piano along the axis parallel to the ramp (i.e. what is the acceleration down the ramp?).