During a circus act, one performer swings upside down hanging from a trapeze holding another, also upside-down, performer by the legs. if the upward force on the lower performer is three times her weight, how much (in m) do the bones (the femurs) in her upper legs stretch? you may assume each is equivalent to a uniform rod 31.0 cm long and 1.78 cm in radius. her mass is 55.0 kg.

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

In a system, when potential energy decreases, then entropy also decreases. true false

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped