A 5kg ball is on top of the school building at a height of 40m above the ground. A. calculate the potential energy of the ball at that height.

B. How much power would it take to get the ball from the ground to that height in 1 minute.

C. If it is dropped what type of energy will the ball have as it approaches the ground.

D. What speed will the ball hit the ground

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.