Which planet has a greenhouse effect?
A. Mercury
B. Mars
C. Venus
D. Earth
E. Venus, Earth, and Mars
Answer: E
Physics & Space Science
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Charge +2q is placed at the origin and charge -q is placed at x = 2a. Where can a third positive charge +q be placed so that the force on it is zero?
What will be an ideal response?
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What was the approximate diameter of the object which denoted in the sky above Chelyabinsk in 2013?
A) 10 km B) 20 meters C) 1 meter D) 100 meters
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The energy required to ionize a hydrogen atom from the ground state is
A) 27.2 eV. B) 13.6 eV. C) 6.8 eV. D) 3.4 eV. E) infinite.
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The attractive force a 70 kg person exerts on Earth is much, much smaller than the force Earth exerts on the person.
a. true b. false
Physics & Space Science