What makes simple machines useful for people without enough strength to
complete a task?
a) work is reduced, while time is decreased.
b) input force is reduced, while time is increased,
c) power is creased, while distance is decreased. d) input force is reduced, while distance is increased.

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

Suppose the house in question 3 is located in cleveland where the annual average solar flux is 160 w/m2 . if 10 m2 of solar panels operating at 20 percent efficiency were installed on this house to collect and store solar energy in the form of hot water:

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