Mechanics | Relativity Answers

A 25.0 kg ball rolls off a 3.0 meter, frictionless ramp, inclined at 30.0º onto a level, frictionless floor for 25.5
seconds. Then it rolls up another frictionless ramp of equal degree and 3.5 meters in length. What is the potential
energy of the ball at part I (fig 1)? What is the kinetic energy of the ball at the part I/part II boundary? What is the
work done in part I and in part II? What is the total work done on the system from start to finish? What kind of
potential energy is described in part I? If the 2nd ramp in part III were only 2.5 m, at what velocity (remember,
speed and direction) will the ball leave the ramp? If instead you have a loop-d-loop that is as high as the 3.0 ramp
is above ground, what would be the necessary initial velocity to complete passing through the loop?

If a force of 86 lbs parallel to the surface of a 20 degree inclined plane will push a 120 lb block up the plane at a constant speed. What is the coeffficient of sliding friction

a bullet of mass 0.04kg mpoving with a speed of 90meters per second square enters a heavy wooden block and is stopped after a distance of 60 cm. what is the average resistive force exerted by the block on the bullet??

An electron collides elastically with a stationary hydrogen atom. The mass of the hydrogen atom is 1837 times that of the electron. Assume all motion is along a straight line. What is the ratio of the kinetic energy of the hydrogen atom after the collision to that of the of the electron before the collision?

rocket has initial velocity of 35m/s-1.acceleration is 5.0m/s-2.engine break at hight 20km.what the maximum height achived by the rocket

when you keep an object motionless,you are doing resistive work?

1 a) Write down, in words, the equation connecting speed, distance and time. [1] b) A car travels at a steady speed of 20 m/s. Calculate the distance travelled in 5

By using mass[M] , length[L], time[T] and current[A], find the dimension of permeability?

A man is lost in the woods. He wanders 3.0km N, then 7.0km E, then 7km S, then 4km W. What is the magnitude and direction of his resultant displacement?

A hunter walks 225 m towards the north, then 125m 35 degrees N of E, then 145m 25 degrees S of W. What is his resultant displacement? You must use component method.