Archimedes' principle applies to
A) liquids.
B) gases.
C) fluids.
D) all of the above
Answer: D
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In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What wavelength (in nm) is needed to have the intensity at a point 1 mm from the central maximum on the screen be 80% of the maximum intensity?
a. 900 b. 700 c. 500 d. 300 e. 600
On Venus the Sun rises in the west and sets in the east.
Answer the following statement true (T) or false (F)
A bar magnet passes through a circular loop of wire as shown below. At the instant that the middle of the magnet passes through the loop, the induced current ( as seen from the coil # 2) is
A. ccw and increasing.
B. cw and decreasing.
C. cw and increasing.
D. zero.
When a car goes around a circular curve on a level road without slipping,
a. no frictional force is needed because the car simply follows the road. b. the frictional force of the road on the car increases when the car's speed decreases. c. the frictional force of the road on the car increases when the car's speed increases. d. the frictional force of the road on the car increases when the car moves to the outside of the curve. e. there is no net frictional force because the road and the car exert equal and opposite forces on each other.