A 3.0m beam of negligible weight is balancing in equilibrium with a fulcrum placed 1.0m from its left end. If a force of 30.N is applied on its right end, how much force would need to be applied to the left end?

Abug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . what minimum coefficient friction is required so that the bug stays on the turntable?

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

Of is j/kg·k. if a 2.6 kg of isk to k, is ?