An astronaut is piloting a spacecraft, which is in a circular orbit around Earth. A space station is ahead, on the same circular orbit. If he fires his rockets briefly to increase the forward speed of the rocket, what will happen?
What will be an ideal response?
The spacecraft will be put into an elliptical orbit with a perigee, the distance of closest approach to the center of Earth, equal to the original radius. The average radius of this orbit is larger, so it will take longer to complete one revolution. So when he completes one revolution, bringing him back to the original radius, he will have fallen further behind.
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Why are there no small craters on the surface of Venus? a. The thick atmosphere protects the surface from small meteorites
b. Old surfaces have been subducted by convection currents. c. Venus formed after the heavy bombardment period. d. Weathering and erosion removed all craters. e. Shield volcanoes prevent small craters to remain on exist on the surface.
The day on Earth for which people in the Northern hemisphere experience the longest amount of daylight compared to night.
summer solstice winter solstice vernal equinox winter solstice
Which of the following was an important source of prebiotic molecules (e.g., amino acids) on the early Earth?
A) molecules produced on the surface by impacts B) molecules produced by chemical reactions near deep-sea ocean vents C) molecules transported to the surface by impacts D) all of these
An AC series circuit has 16.5 ? resistance, 12.8 ? inductive reactance and 8.27 ? capacitive reactance. If an effective (rms) emf of 145 V is applied, what is the effective (rms) current value?
a. 7.56 A b. 8.47 A c. 0.495 A d. 23.7 A e. 6.89 A