Mechanics | Relativity Answers

A coin lying on a meterstick starts to slide when one end of the stick is raised 36.4 cm above the horizontal. (a) What is the limiting angle for friction? (b) What is the coefficient of starting friction?

A coin lying on a meterstick starts to slide down when one end of the stick is raised

36.4cm above the horizontal. Find

a) The limiting angle for friction

b) The coefficient of starting friction

A fighter jet takes-off from an aircraft carrier and climbs in the air with an angle of 42.1 degrees above the horizontal and a speed of 122 m/s.The speed and direction of the jet constitutes a vector quantity known as the velocity.What is the horizontal component of the plane's velocity?

A train has a max speed of 20m/s w/c it can achieve at an acceleration of 0.25m/s². With its brake fully applied, the train has a deceleration of 0.5m/s². What’s the shortest time that the train can travel b/w stations 8k m apart if it stops at both?

a 0.40-kilogram mass is sliding on a horizontal friction less air track with a speed of 6.0 meters per second when it instantaneously hits and sticks to a 2.6-kilogram mass initially at rest on the track. The 2.6-kilogram mass is connected to one end of a mass less spring, which has a spring constant of 200 newtons per meter. The other end of the spring is fixed.

The equation of motion:

r = -10i + 15t j + 5t2k

Q: (1)The average velocity from t=Is to t=2s

(2) The instantaneous velocity and acceleration at t=2s.

A tall fat and skinny girl athlete of mass 55 kg throws a ball of mass 0.80kg against a wall. The ball strikes the wall horizontally with a speed of 25m/s and it bounces back with the same speed. The ball is in contact with the wall 0.050s. Determine the magnitude of the average force exerted on the wall by the ball?

A certain traveling wave has frequency of 200hz. A wave length of 2m and an amplitude of 0.04m. calculate the displacement (Y) at a point (x) 0,3 from the origin at a time 0.01sec after zero displacement at that point (note, the wave is traveling in opposite direction).

A 40 kg slab rests on a frictionless floor. A 10 kg block rests on the top of the slab. The coefficient of static

friction is 0.6 while the coefficient of kinetic friction is 0.4. 10 kg block is acted upon by a horizontal force

F. What is the resulting acceleration of the slab if (i) F = 40 N