What role does friction play in the efficiency of machines

An object traveling in a straight line accelerates. What will definitely happen due to the acceleration?

If atoms are made of smaller parts, why are they considered the basic unit of matter

Would you be doing more work going up the stairs twice as fast?

Who expressed particles by wave equations?

All visible light (light that our eyes can detect) has wavelength between 400-700 nanometers. Wavelengths just smaller than 400 nm are Ultraviolet light. Wavelengths just larger than 700 nanometers are infrared light.

They are generally thought to be blank naturally occurring emotions that are present from birth

If an aircraft is loaded 90 pounds over maximum certificated gross weight and fuel (gasoline) is drained to bring the aircraft weight within limits, how much fuel should be drained?

3. Shortwave radio is broadcast between 3.50 and 29.7 MHz, To what range of wavelengths does this correspond? Why do you suppose this part of the spectrum is called shortwave radio?

How does a star's temperature change as the star ages from a main sequence star to a red giant and from a red giant to a white dwarf?

What factors in the atmosphere seem to have the greatest effect in the amount of radiation received from the sun?