Two spheres are rolling without slipping on a horizontal floor. they are made of different materials, but each has mass 5.00 kg and radius 0.120 m. for each the translational speed of the center of mass is 4.00 m/s. sphere a is a uniform solid sphere and sphere b is a thin-walled, hollow sphere.

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

Idon’t quite understand this problem