Our best data about the surface topography of Venus has come from:
A) Magellan radar data and radar observations of the planet from Earth.
B) spacecraft flybys like Mariner 2 and visual observations of the planet.
C) radio and visual observations.
D) orbiter photos from Pioneer Venus Orbiter.
E) the three flybys of Mariner 10.
A
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Magnetic Field of a Current Loop: Consider two current-carrying circular loops. Both are made from one strand of wire and both carry the same current, but one has twice the radius of the other. If the magnetic field strength at the center of the smaller loop is B, what is the magnetic field strength at the center of the larger loop?
A. 8B B. 4B C. 2B D. B/2 E. B/4
After an earthquake, an S-type seismic wave travels with a velocity of about 10 km/s and reaches another part of Earth in about 10 minutes. How far has the S-type wave traveled?
A. 1,000 km B. 60 km C. 600 km D. 100 km E. 6,000 km
What does it mean to say that the values of properties like spin are quantized?
A) The property can take on specific values, but not any values in between. B) The property can only take values that are separated by integer amounts. C) The property can only take values that are positive so they can be counted. D) The property can take on any value, but our measurements will always rounded.
When Nellie Newton hangs by the ends of a rope draped over a large pulley, the tension in each supporting vertical strand is
A) half her weight. B) equal to her weight. C) twice her weight. D) none of the above