Upon which point do Copernicus and Kepler disagree?
A) The Moon orbits the Earth.
B) The Earth orbits the Sun.
C) Retrograde motion occurs when one planet overtakes another.
D) The orbits of the planets are ellipses, with one focus at the Sun.
E) Venus will appear as a crescent when she retrogrades between us and the Sun.
D
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What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the Sun?
a. Magnetic and electric fields heat the planet. b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source. c. The planets are still radiating heat from when they first formed. d. Friction between the planet and its moons heat the planet.
What method has been used to determine the most recent time the Tharsis volcanoes on Mars have erupted?
A) measuring the thickness of lava flows on their sides B) measuring the intensity of infrared radiation emitted by them C) measuring the changes in sulfur compound concentrations in the planet's atmosphere D) counting the craters on their slopes
An electron is accelerated from rest through a potential difference of 3750 V. It enters a region where the magnetic field is 4.0 mT perpendicular to the velocity of the electron. Calculate the radius of the path this electron will follow
A) 1.2 cm B) 2.2 cm C) 3.2 cm D) 4.2 cm E) 5.2 cm
The ____ occurs when a rapidly rotating conductor is stirred by convection to produce a magnetic field
a. dynamo effect b. Zeeman effect c. Babcock effect d. proton-proton chain e. aurora