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One way that astronomers detect planets around distant stars is by observing to see if there is a _________ in the light that reaches us from a particular star. The reason that the star moves away or toward us is a ________ due to the gravitational effects of the planet. A. signal, contraction B. Doppler shift, contraction C. signal, perturbation D. Doppler shift, perturbation
Weegy: D. Doppler shift, perturbation User: ________ due to the gravitational effects of the planet. A. signal, contraction B. Doppler shift, contraction C. signal, perturbation D. Doppler shift, perturbation Weegy: D. Doppler shift, perturbation User: A planet has half the mass of the Earth and half the radius. Compared to its weight on Earth, an apple on this planet would weigh _____. A. twice as much B. one-fourth as much C. half as much D. the same E. zero Weegy: A planet has half the mass of the Earth and half the radius. Compared to its weight on Earth, an apple on this planet would weigh A. TWICE AS MUCH. (More)
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Asked 3/18/2013 12:24:18 PM
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The higher a satellite is, the _____. A. less its speed is B. greater its speed is C. longer its period is D. both A and C E. both B and C
Weegy: The higher a satellite is, the _ D. both A and___ User: When a star collapses to form a black hole, its mass _____. A. decreases B. remains the same C. increases (More)
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Asked 3/18/2013 12:38:04 PM
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An object dropped from rest almost infinitely far from Earth falls to Earth because of Earth's gravitational field, and strikes the surface with a speed of about _____. A. 8 km/s B. 9.8 m/s C. 11 km/s D. none of the above
Weegy: An object dropped from rest almost infinitely far from Earth falls to Earth because of Earth's gravitational field, and strikes the surface with a speed of about C. 11 km/s. (More)
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Asked 3/18/2013 12:50:20 PM
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An object dropped from rest almost infinitely far from Earth falls to Earth because of Earth's gravitational field, and strikes the surface with a speed of about _____. A. 8 km/s B. 9.8 m/s C. 11 km/s D. none of the above
Weegy: An object dropped from rest almost infinitely far from Earth falls to Earth because of Earth's gravitational field, and strikes the surface with a speed of about C. 11 km/s. (More)
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Asked 3/18/2013 12:51:35 PM
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According to David Taylor of the Bank Administration Institute, about _____ percent of households with annual incomes over $50,000 have PCs equipped with modems. A. 30 B. 40 C. 50 D. 60
Weegy: According to David Taylor of the Bank Administration Institute, about D. 60 percent of households with annual incomes over $50,000 have PCs equipped with modems. (More)
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Asked 3/18/2013 5:23:11 PM
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