Dad is pushing his son on the merry-go-round in the park. The merry-go-round has a mass of 160 kg and a diameter of 2.40 m; dynamically, it can be treated like a disc. His 35 kg son is sitting 0.80 m from the center of the merry-go-round. If dad pushes with a tangential force of 45.0 N for 1.50 seconds three times, what is the final angular velocity of the merry-go-round, and how fast is his son moving (tangentially) if the merry-go-round starts from rest

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

What is created when solids,liquids,an gases mix with one another

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).