If we allow for a simple runaway greenhouse effect, the inner boundary of the Sun's habitable zone would be
A) roughly halfway between the orbits of Venus and Mercury
B) just outside the orbit of the planet Mercury
C) roughly half way between the orbits of the Earth and Venus
D) just inside the orbit of the Earth
Question 2A mass which weighs 19.6 Newtons on Earth is 2.3 meters away from a 2.00 kg mass.
(a) Determine their mutual gravitational attraction to each other.
(b) How much work would have to be done to put a very large distance between the two masses?
Question 3A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge and the silk
A) acquires a positive charge also.
B) remains neutral.
C) acquires a negative charge.
D) could either be positively charged or negatively charged. It depends on how hard the rod was rubbed.
Question 4Consider a small satellite moving in a circular orbit (radius r) about a spherical planet (mass M). The period does not depend upon
A) g at the satellite position.
B) the planet mass.
C) the satellite mass.
D) the radius r.
E) the universal gravitational constant.
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