Double-Slit Interference: In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits. A screen is placed 2.0 m from the slits. At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?
A. 1.5 mm
B. 3.0 mm
C. 4.5 mm
D. 6.0 mm
Answer: C
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Work-Energy Theorem: A driver, traveling at 22 m/s, slows down her 2000 kg truck to stop for a red light. What work is done on the truck by the friction force of the road?
A. -2.2 × 104 J B. -4.4 × 104 J C. -4.8 × 105 J D. -9.7 × 105 J
On bracket ABCDEF, each y-direction force acts at the center of the bar segment to which it is applied (see figure). All turns of ABCDEF are 90o angles. The resultant moment at B (MB) for this parallel force system is (in N?m)
(A) 395j 1 1080k
(B) 415i 1 875k
(C) 485i 2 913k
(D) 2485i 1 913k
The de Broglie wavelength of a 0.069 kg golf ball is 4.67 × 10^?34m. What is its speed? (h = 6.63 × 10^?34 J?s)
a. 10 m/s b. 21 m/s c. 3.1 m/s d. 90 m/s e. 4.5 m/s
Electromagnetic waves can travel in
A) a vacuum. B) water. C) both of these D) none of the above