The image of a 15 cm ornament can be seen in a plane mirror hanging 3 m away in the living room. Find the height, magnification and distance of the image

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

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?