In the above H-R diagram sketch, which star is a red dwarf?
A. A
B. B
C. C
D. D
E. E
Answer: C
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?Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity?
A. ?3 polarizing filters, each rotate beam by 30°. B. ?2 polarizing filters, both rotate beam by 45°. C. ?1 polarizing filter, rotating beam by 90°. D. ?None of the above, polarized light can't be rotated.
To initiate motion, a(n) ______________ force is necessary
Fill in the blank(s) with correct word
A fan, electric heater, and lamp are connected in parallel across a 120-V line. The resistances are Rlamp = 148 ?, Rheater = 32 ?, and Rfan = 48 ?. What is the total current supplied to the circuit?
a. 17.0 A b. 7.06 A c. 0.526 A d. 1.90 A
A 12.0-N object is oscillating in simple harmonic motion at the end of an ideal vertical spring
Its vertical position y as a function of time t is given by y(t) = 4.50 cm cos[(19.5 s-1)t - ?/8]. (a) What is the spring constant of the spring? (b) What is the maximum acceleration of the object? (c) What is the maximum speed that the object reaches? (d) How long does it take the object to go from its highest point to its lowest point?