Calculate the kinetic energies of the following objects moving at the given speeds: (a) a 120 kg football linebacker running at 8.5 m/s; (b) a 3.6 g bullet at 897 m/s; (c) the aircraft carrier Nimitz, 91,400 metric tons at 27 knots. (1 metric ton = 1000 kg, 1 knot = 0.514 m/s)

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Drag each tile to the correct box. tiles bra i sequence

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)