3) An electric traction motor provides a torque of 400 N.m while rotating through 60 revolutions in1seconds. If the motor is 75% efficient, determine the electrical power input in kW.

Round to the nearest one decimal place.

5) A spring is 13 in. long when loaded with 24 lb and 6.5 in. long when loaded with 25 lb. Determine the spring constant in lb/in.

Round to the nearest two decimal places.

7) What is the power output of a motor that provides a torque of 2,684 N*m while running at 3,476 rpm?

Provide your answer in kW and round to the nearest whole number.

10) Mountain highways with long descents have "escape" roads with a steep incline for vehicles to take if their brakes have failed. If one of these roads is inclined at 41 degrees above horizontal, how long must it be to stop a truck weighing 20,000 lb that is traveling at 54 mph?

Provide your answer in ft and round to the nearest whole number.

12) Determine the acceleration of block A down the slope in the figure where 33 is the mass of the block in kg and 0.19 is the coefficient of friction.

x kg A 15 12 = y