The weight of a spacecraft, including fuel, is 11,600 lb when the rocket engines are fired to increase its velocity by 360 ft/s. Knowing that 1000 lb of fuel is consumed, determine the relative velocity of the fuel ejected.

During terrible weather at a ski-flying world championship, a ski jumper tried to adjust for bad conditions midway down the ramp but completely lost control and tumbled wildly off the side at its bottom into a scattering crowd. The 73-kg jumper left the ramp about 45 m lower than his starting position. If the ski jumper had simply fallen straight down 45-m rather than skiing down a ramp, would his kinetic energy increase?

A 180-lb man and a 120-lb woman stand side by side at the same end of a 300-lb boat, ready to dive, each with a 16-ft/s velocity relative to the boat. Assuming that the woman dives first, determine the work done by the woman and by the man as each dives from the boat. The work done by the woman is The work done by the man is ft-lb. ft-lb.

Small steel balls, each with a mass of 150 g, enter the semicircular trough (Radius =0.92 m) in the vertical plane with a horizontal velocity of VA=7.9 m/s at A. Friction is negligible. UB B VA A velocity at C (m/s) a. 6.66 о Б.7.99 c. 5.33 d. 9.33 e. 2.66 normal reaction at C velocity at B (m/s) О а. 6.16 b. 5.13 C. 4.11 d. 3.08 е. 2.05 O O

A jet airliner is cruising at a speed of 900 km/h with each of its three engines discharging air with a velocity of 800 m/s relative to the plane. Determine the speed of the airliner after it has lost the use of (a) one of its engines, (b) two of its engines. Assume that the drag due to air friction is proportional to the square of the speed and that the remaining engines keep operating at the same rate.