Resistance describes a matireals ability to

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.