Conservation of Momentum

If a metal ball strikes a pendulum and sticks to it. It will have a relationship for conservation of momentum of m*v = (m + M) *V (m and v are the mass and initial velocity of the projectile, M is the mass of the pendulum with no initial velocity and big V is the combined velocity of the pendulum and projectile). The conservation of energy after the collision is : 1/2 (m + M) * V^2 = (m + M)gh The vertical rise of the pendulum is represented by h and the horizontal distance swung through is d. The quantities are related by: R^2 = (R-h)^2 + d^2 Based on these equations, I need to derive a relationship for little v (on quantities m,M, g, R, d) and for d (in terms of m, M, g, R,... click for more

Work and Energy

On an incline a 2.00 kg block is released 4.00m from a long spring with a force constant k= 60.0 N/m that is attached at the bottom of the incline. The incline makes the angle of 53 degrees with the horizontal, and the coefficients of friction between the block and the incline are u static = .40 and uk= .20. a) what is the speed of the block just before it reaches the spring? b.) what will be the maximum compression of the spring? c.) the block rebounds back up the incline. How close does it get to its initial position?

Temperatures of two similar metal spheres differently fixes in the space. The problem which does not need calculations but only a correct understanding of the applied energy distribution.

Problem. Two similar metal spheres are located at the same height from the earth surface. The first is pended on the end of a rod and the second is propped up (supported) by the similar rod. Both are heated with the same quantity of heat Q. Will the temperatures of these two spheres be equal? If not, the temperature of which is higher?

Temperatures of two similar metal spheres differently fixes in the space. The problem which does not need calculations but only a correct understanding of the applied energy distribution.

Problem. Two similar metal spheres are located at the same height from the earth surface. The first is pended on the end of a rod and the second is propped up (supported) by the similar rod. Both are heated with the same quantity of heat Q. Will the temperatures of these two spheres be equal? If not, the temperature of which is higher?

speed and motion

A wheel on a grinder is a uniform 0.9kg disk of 8cm radius. It coasts uniformly to rest from a speed of 1400rpm in a time of 35s. How large a friction torque slows its motion?