Power Practice Problems
A road worker moves a 32 kg road marking machine by pushing it with a force of magnitude F, making an angle of 25 ° below the horizontal. The marking machine rolls at a constant speed of 0.5 m/s on a horizontal asphalt road surface. The coefficient of rolling friction between the marking machine and the asphalt is 0.18. Find the power delivered by the worker.
A 2.0-kg weight plate is moving on a rough, horizontal surface where the coefficient of kinetic friction is 0.100. It is moving at 5.00 m/s until friction causes it to stop. Calculate the average power generated by friction on the plate as it comes to a stop.
For T - (130 kg)(9.8 m/s2) = (130 kg)(1.25 m/s2) and P = T(3.0 m/s), where T is the tension and P is the power. Select the drawing that matches the equation.