The lowest amount of solar energy per square meter is incident upon the surface of Earth in the northern hemisphere on or about
a. December 21, the winter solstice.
b. March 21, the vernal equinox.
c. September 21, the autumnal equinox.
d. June 21, the summer solstice.
a
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Which of the following is a general difference between a planet and a star?
A) Stars shine with energy released by nuclear fusion while planets shine primarily with light reflected from stars. B) Stars are found in galaxies, but planets are not part of galaxies. C) Stars are made of gas and planets are made of rock. D) Stars are stationary while planets orbit stars.
Process of Science: Our theory of solar system formation suggests that larger planets cool more slowly than small ones
What does this suggest regarding geologic activity on Venus? Do we expect Venus to be geologically active? How did scientists test this hypothesis?
A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
A. 25.3 m B. 29.6 m C. 27.4 m D. 23.6 m E. 18.9 m
A deep space probe moving forward in space needs to make a course correction and so fires a thruster on the side of the probe 90° away from its direction of motion, as shown below. This thruster, while on, exerts a constant force on the probe perpendicular to its original direction of motion. While the thruster is operating, which trajectory best describes the probe’s motion? (Hint: Note that the thrust force delivers an upward impulse to the probe during every successive time interval. Consider what happens to the ball in figure C2.4 as it receives analogous continual downward impulses.)
A. A
B. B
C. C
D. D
E. E