an input work in a machine result in an output work of 400J. if the amount of energy dissipated by friction is 100J, what is the effiency of the machine? A 0.8 B 1.25 C 0.4 D0.6

In what direction does the medium move relative to the direction of the wave? explain.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?