1) A rock is thrown and flies past a window that is 1.50 m wide and 0.750 m tall. At a time t = 0 s, the rock passes the lower corner of the window. At time t = 0.250
seconds, the same rock passes the upper right corner of the window. The rock was
initially thrown from a point 3.5 meters lower than the bottom edge of the window.
A. At what speed and angle was the rock moving just after it was thrown?
(Vin

A75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high-efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75. taking the cost of electricity to be $0.12/kwh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. also, determine the simple payback period if the pu