Calculate the kinetic energies of the following objects moving at the given speeds: (a) a 120 kg football linebacker running at 8.5 m/s; (b) a 3.6 g bullet at 897 m/s; (c) the aircraft carrier Nimitz, 91,400 metric tons at 27 knots. (1 metric ton = 1000 kg, 1 knot = 0.514 m/s)

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?

Ameter stick is pivoted at the 0.50-m line. a 3.0-kg object is hung from the 0.15-m line. where should a 5.0-kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.