The uncertainty principle was derived by whom?
a. Schrödinger
b. Heisenberg
c. de Broglie
d. Compton
b
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Changing the accelerating voltage of an x-ray machine without changing the target material must change:
a. the work function of the material. b. the wavelength of all the x-rays produced. c. the wavelength of the minimum wavelength x-ray that will be produced. d. Both b and c are correct.
John says that the value of the function cos[?(t + T) + ?], obtained one period T after time t, is greater than cos(?t + ?) by 2?. Larry says that it is greater by the addition of 1.00 to cos(?t + ?). Which one, if either, is correct?
a. John, because ?T = 2?. b. John, because ?T = 1 radian. c. Larry, because ?T = 2?. d. Larry, because ?T = 1 radian. e. Neither, because cos(? + 2?) = cos?.
Using an angle of 30
to supply the force required to slide a box along a floor with a coefficient of friction of 0.30, which would require the least force to move it?
A. pull it with a rope B. push it C. either push or pull D. not enough information to solve
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The force F2 needed to keep piston 2 in place is __________.