What acceleration can a person produce when pushing a lawn mower? Suppose that the Net External force exerted on the lawn mower is 51N, and that the mass of the mower is 24 Kg. What is its acceleration?

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)