Uranus and Neptune appear blue or blue-green because
a. their atmospheres absorb blue light very efficiently.
b. their solid air-less surfaces are this color
c. their surfaces are covered with liquid water with no atmosphere
d. traces of methane in their atmospheres absorb red light very efficiently.
d
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Using equations: The force due to gravity between two objects can be described using the equation
How would one use Newton's second law to setup an equation one could use to find the gravitational acceleration experienced by an isolated astronaut 10,000 km from the Earth's center?
Why are there fewer large impact craters on the Earth's seafloor than on the continents?
A) Seafloor crust is younger than continental crust, so it has had less time in which to suffer impacts. B) The oceans slow large impactors and prevent them from making craters. C) Erosion erases impact craters must faster on the ocean bottom than on land. D) Most impacts occur on the land.
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)
You have a heavy piece of equipment from a 1. mm diameter wire. Your supervisor asks what the length of the wire will be doubled without changing how far the wire stretches. What diameter must the new wire have?
A. 1.0 mm B. 1.4 mm C. 2.0 mm D. 4.0 mm