Ireally don't know estimate the length of the day if the centripetal acceleration at the equator due to the spinning earth was equal to the acceleration of free fall (g=9.8 ms⁻²)

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.