The presence of a Mercurian magnetic field surprised the planetary scientists on the Mariner 10 team because:
A) Mercury is low in iron.
B) Mercury spins to rapidly to produce a stable dynamo.
C) It's still too hot for its core to have differentiated.
D) The dynamo theory predicted that Mercury was spinning too slowly for one.
E) Mercury lacks an iron core.
D
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Buoyancy: A hot air balloon along with its cargo has a mass of 4.0 × 105 kg, and it holds 7.0 × 105 m3 of hot air. It is floating at a constant height in air with a density of 1.29 kg/m3. What is the density of the hot air in the balloon?
A. 1.4 kg/m3 B. 0.72 kg/m3 C. 0.57 kg/m3 D. 0.86 kg/m3 E. 0.43 kg/m3
A neutral hollow spherical conducting shell of inner radius 1.00 cm and outer radius 3.00 cm has a +2.00-µC point charge placed at its center. Find the surface charge density (a) on the inner surface of the shell. (b) on the outer surface of the shell
What will be an ideal response?
A high-mass star dies more violently than a low-mass star because:
A) it must always end up as a black hole. B) it generates more heat and its core eventually collapses very suddenly. C) it cannot fuse elements heavier than carbon. D) gravity is weakened by its high luminosity. E) it is most often found as part of a binary system.
Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.40). How thick is the bubble (in nm) if destructive interference occurs in the reflected light?
a. 102 b. 179 c. 54 d. 1 e. 89