If the form of a sound wave traveling through air is s(x, t) = (7.0 nm) cos(kx + (3000 rad/s)t + φ), how much time does any given air molecule along the path take to move between displacements s = +2.1 nm and s = -2.1 nm?

Abaseball picther can throw a ball at about 90 miles per hour, v = 40 m/s, on solid rock ground. we now put him into space. when he throws the ball, which weighs mb = 0.15 kg moves away from himat the same speed. how long does it take the ball thrown in space to travel the 30 meters to the batter? he weighs mp = 100kg

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.