A 39 kg boy runs with a velocity of 3.8 m/s. How much kinetic energy does he have? Then he grabs on to a rope that is hanging from the ceiling, and swings from the end of the rope. How high off the ground will he swing?

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Arrange the images in order to show how lake-effect snow occurs.

What sort of waves exhibit the doppler effect?