The pin at A in Problem 3.7 is removed and the pole rests on a rough surface at A in the position shown in the figure below. The minimum coefficient of friction at A required for equilibrium is:
(A) 0.41
(B) 0.25
(C) 0.37
(D) 0.64
(A) 0.41
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Why is the Earth's daytime sky blue?
A) Molecules scatter blue light more than red light. B) The sky reflects the blue of the oceans and lakes. C) Air molecules are blue in color. D) Molecules absorb more red light than blue light.
A scientist named ______________ discovered radioactivity in 1896
Fill in the blank(s) with correct word
Coal beds are formed from the accumulation of plant material that becomes trapped in swamp floors. Yet coal deposits are present in the continent of Antarctica, where no swamps or vegetation exists. How can this be?
What will be an ideal response?
The plates of a parallel plate capacitor of capacitance 
are horizontal. Into the gap a slab of dielectric material with 
is placed, filling the bottom half of the gap between the plates. What is the resulting new capacitance?
A.
B.
C.
D.
E.
