perpetual motion machines have fascinated people -especially... perpetual motion machines have fascinated people -especially inventors- for hundreds of years before the laws of thermodynamics becomes known. ideally, ones energy is added to start a perpetual motion in machine, the machine would continue to operate indefinitely. using a law of thermodynamics, explain why such a machine cannot be produced

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

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.