Alarge wooden turntable in the shape of a flat uniform disk has a radius of 2.00 m and a total mass of 120 kg. the turntable is initially rotating at 3.00 rad> s about a vertical axis through its center. suddenly, a 70.0-kg parachutist makes a soft landing on the turntable at a point near the outer edge. (a) find the angular speed of the turntable after the parachutist lands. (assume that you can treat the parachutist as a particle.) (b) compute the kinetic energy of the system before and after the parachutist lands. why are these kinetic energies not equal

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

The particles that are found in the nucleus of an atom are