A mass of 6.50 kg is suspended from a 1.31 m long string. it revolves in a horizontal circle. The tangential speed of the mass is 3.12 m/s. calculate the angle between the string and the vertical.

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec