The orbits of planets being elliptical was one the planetary laws developed by
a. copernicus.
b. ptolemy.
c. kepler.
d. brahe.

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.