A bulldozer with a blade load of 12 LCY is working on hard material for a distance of about 80 ft(for operating speed). It has a power-shift gear (for fixed cycle time) with an average reverse speed of 4 mph (return speed). Work efficiency is 50 min/hr. Estimate its productivity.

What precautions should you take to prevent injuries when dealing with heavy loads?

Aplate of dimensions 3 m x 3 m is placed 0.37 mm apart from a fixed plate. the plate requires a force of 2n to move at speed of 45 cm/s. evaluate the viscosity of the fluid in between the plates

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.