What is the lift force (in newtons) on an airplane wing of area 88 m^2 if the air passes over the top and bottom surfaces at speeds of 260 m/s and 170 m/s, respectively?

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.

You can melt ice by applying pressure because the solid/liquid line has a slope.

Which of the following best describes the shape of earth's orbit? a.ellipticalb.circularc.spirald.figure eight