The diagrams below show forces applied to a wheel that weighs 20 N. The symbol W stands for the weight. In which diagram(s) is(are) the wheel in equilibrium?
A. A
B. B
C. C
D. D
E. A and C
Answer: C
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Suppose you go outside and see the view shown when you look due south. Knowing that the stars of Orion's Belt lie close to the celestial equator, what can you conclude?
A) You are in the Northern Hemisphere. B) You are in the Southern Hemisphere. C) It is winter. D) In a couple of hours, Lepus will be higher in the sky than Orion.
A square coil and a triangular coil each have sides of length L. The triangular coil has twice as many turns as the square coil. If a the same current is sent through each coil, when the coils are placed in the same uniform magnetic field making an angle of 30° with the planes of the coils, which coil experiences the greater torque?
a. the square coil b. the triangular coil c. Both coils experience the same torque. d. It depends on the magnitude of the magnetic field that the coils are placed in.
A circular cylinder of height 1.20 m having faces of diameter 0.620 m is immersed in water of density 1.00 × 10^3 kg/m3 with its axis vertical so that its faces are parallel to the surface of the water. The upper face is 2.50 m below the surface of the water. The net force on this cylinder is observed to be 1120 N downward. Atmospheric pressure is 1.01 × 10^5 Pa. What is the weight of the cylinder?
A) 7.40 × 10^3 N B) 1.09 × 10^4 N C) 3.79 × 10^4 N D) 4.14 × 10^4 N E) 1.37 × 10^5 N
Pluto's density is 1.8 g/cm3 . Iron is about 5 g/cm3 . Rock is about is 3 g/cm3 . Ice or water is 1.0 g/cm3 . . This implies that
a. Pluto has a large iron-nickel core. b. Pluto is about 50% water and 50% rocky material. c. Pluto is all rock. d. Pluto is all water or water ice.