A hospital has a back-up generator to power the medical devices in case of a power failure. Which of the following is the most likely source of mechanical
energy for the generator?

A. Burning coal

B. Sunlight

C. Gasoline or diesel fuel

D. Falling water

That depends on what kind of environ meant it is in  in space it has the same force that was applied when the velocity was gained

490 n  f=125n a=2.5m/s2

M= 700 kgvalue of g( gravity) is constant = 9.8 m/s² or 10 m/s² w = mg = 700*9.8 = 6860n or 6.680*10³ n

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.