The celestial prime meridian is an imaginary half-circle running from the north celestial pole to the south celestial pole and crossing perpendicular to the celestial equator at the point of the
a. autumnal equinox.
b. summer solstice.
c. vernal equinox.
d. winter solstice.
c
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Consider the situation described in problem E9T.10. If current flows in the loop, the magnetic field will exert magnetic forces on the various loop legs, and in some cases there may be a net magnetic force on the loop. If so, we will have to exert a force to keep the loop moving at a constant velocity. In each of the five cases, determine whether the net force we have to exert is The loop has not yet entered the magnetic field.
A. forward (in the +x direction).
B. backward (in the -x direction).
C. zero.
D. some other direction (specify).
A 70-kg stunt artist rides in a rocket sled which slides along a flat inclined surface. At an instant when the sled's acceleration has a horizontal component of 6.0 m/s2 and a downward component of 2.8 m/s2, what is the magnitude of the force on the rider by the sled?
A. 0.83 kN B. 0.98 kN C. 0.65 kN D. 0.68 kN E. 0.72 kN
When droplets of condensation form on the outside of a glass of ice water, it must be that in the air right next to the glass
a. the temperature is near the dew point. b. the humidity is near the saturation density. c. the relative humidity is near 100%. d. all of the above
Defects in the subsequent offspring of the recipient of radiation are called ______________ effects
a. genetic b. latent c. somatic d. threshold