Mechanical energy is the sum of two types of energy-kinetic energy and potential energy. Which of the following is an example of an object that has kinetic energy?
A. a snail crawling across a leaf
B. a computer monitor sitting on a desk
C. a tightly wound spring in a windup toy
D. a roller coaster car just before it goes downhill

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.