Two identical springs with spring constant 50 N/m support a 5.0-N weight as in the picture below. What is the tension in spring A?
?
?
A. 1.45 N
B. 2.50 N
C. 2.89 N
D. 3.75 N
E. 5.00 N
Answer: C
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A silicon monoxide (n = 1.45) film of 322-nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10?9 m)
a. 467 nm b. 498 nm c. 623 nm d. 527 nm e. 736 nm
A race car traveling at 100 m/s enters an unbanked turn of 400 m radius. The coefficient of (static) friction between the tires and the track is 1.1 . The track has both an inner and an outer wall. Which statement is correct?
a. The race car will crash into the outer wall. b. The race car will crash into the inner wall. c. The car will stay in the center of the track. d. The car will stay in the center of the track if the driver speeds up. e. The car would stay in the center of the track if the radius were reduced to 200 m.
A(n) ____________________ is observed if our line of sight is along the rotation axis of an active galactic nucleus
Fill in the blank(s) with correct word
Which is the correct evolutionary order?
a. protostar, ZAMS, YSO b. protostar, YSO, ZAMS c. ZAMS, protostar, YSO d. ZAMS, YSO, protostar