Ice tends to form first at the
A) surface of bodies of water.
B) bottom of bodies of water.
C) either depending on water depth.
Answer: A
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Why do we say that the Doppler technique gives the planet's "minimum mass"?
A) The size of the Doppler shift that we detect depends on whether the planet's orbit is tilted. B) The size of the Doppler shift that we detect depends on knowing the star's mass, which can be very uncertain. C) Extrasolar planets are always increasing in mass. D) Doppler measurements are very difficult, producing noisy data that often cause astronomers to underestimate a planet's mass.
Two very long parallel wires carry currents in the positive x direction. One wire (current = 15 A) is coincident with the x axis. The other wire (current = 50 A) passes through the point (0, 4.0 mm, 0). What is the magnitude of the magnetic field at the point (0, 0, 3.0 mm)?
A. 3.8 mT B. 2.7 mT C. 2.9 mT D. 3.0 mT E. 0.6 mT
A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron volts, between the two energy levels involved in producing this light?
A) 0.50 eV B) 0.65 eV C) 0.45 eV D) 0.60 eV E) 0.55 eV
Each 2.0-m length of a long cylinder (radius = 4.0 mm) has a charge of 4.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point 5.0 mm from the axis of the cylinder?
a. 9.9 kN/C b. 8.1 kN/C c. 9.0 kN/C d. 7.2 kN/C e. 18 kN/C