Parallel rays of light that hit a concave mirror will come together
a. at the center of curvature.
b. at the focal point.
c. at a point half way to the focal point.
d. at infinity.
b
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What method was used to determine the absolute ages of the lunar rock samples from the Apollo missions?
a. electromagnetic measuring b. radar imaging c. telescopic observations d. microscopic evaluation e. radioactive dating
An aluminum beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 60 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 16 mm
(C) 22 mm
(D) 26 mm
A boat hits a sandbar and slides some distance before coming to rest. Which of the arrows shown below best represents the direction of the boat’s acceleration as it is sliding? (Hint: Draw a motion diagram.)
A. A
B. B
C. C
D. D
E. E
F. F
T. Zero
A parallel-plate capacitor has plates of area 0.80 m2 separated by a distance of 3.0 mm. What is this capacitor's capacitance?
A) 270 F B) 70 F C) 2.4 × 10-9 F D) 4.8 × 10-10 F E) 3.6 × 10-10 F