Superman twirls a 0.1 kg hammer tied to the end of a 0.6 m rope with negligible mass
horizontally about his head. the hammer makes 3 revolutions every second. the
tension (newtons) in the rope is approximately

If steel is more dense that lake water, why can a boat float

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates