Serving at a speed of 257 km/h, a tennis player hits the ball at a height of 2.6 m and an angle θ below the horizontal. the service line is 11.9 m from the net, which is 0.91 m high. what is the angle θ such that the ball just crosses the net?

What is the angular momentum of the bar about the axle?

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)