A load of 600N is lifted using a first class lever applying an effort of 350N .If the distance between the load and the effort is 60 cm and the distance between the load and the fulcrum is 30cm, calculate its efficiency ​

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?

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

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)