Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. Each bright fringe will shift to the location of the adjacent bright fringe if a thin film is placed in front of one of the slits. The minimum width of this film must be
A.
.B.
.C.
.D.
.E.
.Answer: C
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Compared with the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is
A) considerably less. B) considerably more. C) the same.
What is the expression for the transverse velocity of the wave in a string given by 
?
A.
B.
C.
D.
E.
A cubical box, 5.00 cm on each side, is immersed in a fluid. The pressure at the top surface of the box is 594 Pa and the pressure on the bottom surface is 1133 Pa. What is the density of the fluid?
A) 1,000 kg/m3 B) 1,100 kg/m3 C) 1,220 kg/m3 D) 2,340 kg/m3 E) 12,000 kg/m3
Only two forces act on a 3.0-kg mass. One of the forces is 9.0 N east, and the other is 8.0 N in the direction of 62° north of west. What is the magnitude of the acceleration of the mass?
a. 2.0 m/s2 b. 2.4 m/s2 c. 3.3 m/s2 d. 2.9 m/s2 e. 5.7 m/s2