A monel shell (Em 5 170 GPa, d3 5 12 mm, d2 5 8 mm) encloses a brass core (Eb 5 96 GPa, d1 5 6 mm). Initially, both shell and core are a length of 100 mm. A load P is applied to both shell and core through a cap plate. The load P required to compress both shell and core by 0.10 mm is approximately:
(A) 10.2 kN
(B) 13.4 kN
(C) 18.5 kN
(D) 21.0 kN
(B) 13.4 kN
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A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery (a) the voltage across the capacitor is A
equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.
The term observable universe refers to ________
A) the portion of the universe that is not hidden from view by, for example, being below the horizon B) that portion of the universe that we have so far photographed through telescopes C) that portion of the universe that we can see in principle, given the current age of the universe D) the portion of the universe that can be seen by the naked eye
Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal?
A) The problem remains that not everyone recycles as they should. B) Recycling only forestalls the inevitable depletion of metal resources. C) The atoms don't leave our planet, which is why naturally occurring materials never really reach the point of depletion. D) The problem is with the expense of collecting metal atoms that are uniformly dispersed.
An old red star moving along a random orbit around the bulge is a
A. Pop I star. B. Pop II star. C. Pop III star. D. Pop V star.