If we allow for moisture loss due to a moist greenhouse effect, the inner boundary of the Sun's habitable zone would be
A) just inside the orbit of the Earth
B) roughly halfway between the orbits of Venus and Mercury
C) roughly halfway between the orbits of the Earth and Venus
D) just outside the orbit of the planet Mercury
A
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A girl throws a stone straight down from a bridge. The stone leaves her hand with speed of 8.00 m/s at a height of 12 m above the water below. How much time does it take for the stone to hit the water?
A) 2.58 s B) 0.95 s C) 1.8 s D) 0.41 s E) 17.3 s
How long would it take for charged particles ejected from the sun to affect electrical systems on Earth, assuming the particles traveled at 1.6 million km/h?
A) A few minutes
B) A few hours
C) A few days
D) A few weeks
A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?
a. 3.6 kN up b. 4.3 kN up c. 2.9 kN down d. 2.9 kN up e. 5.8 kN down
Film behind a double slit is exposed to light in the following way: First one slit is opened and light is allowed to go through that slit for time Dt. Then it is closed and the other slit is opened and light is allowed to go through that slit for the same time Dt. When the film is developed the pattern will be
a. one single slit pattern. b. two superimposed single slit patterns, their centers displaced from each other by the distance between the two slits. c. one double slit pattern. d. two double slit patterns, their centers displaced from each other by the distance between the two slits. e. random darkening of the film. (no pattern at all)