The block brake consists of a pin-connected lever and friction block at b. the coefficient of static friction between the wheel and the lever is μs = 0.3, and a torque of 5 n⋅m is applied to the wheel. determine if the brake can hold the wheel stationary when the force applied to the lever is (a) p = 30 n, (b) p = 70 n.

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

In which of the following is positive work done by a person on a suitcase

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?