5. A catapult has two rubber arms, each with a square cross-section with a width 4 mm and length 300 mm. In use, its arms are stretched to three times their original length before release. Assume that the elastic modulus of rubber is 10-3 GPa and that the value does not change when the rubber is stretched. How much energy is stored in the catapult just before release

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.