Earth's oceanic crust ranges in thickness from about
a. 98 to 140 km.
b. 5 to 11 km.
c. 19 to 98 km.
d. 18 to 26 km.
b
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Ohm's Law: For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?
A. current B. resistivity C. 1/(current) D. power E. 1/(resistivity)
Molecular clouds are mapped using CO instead of hydrogen because CO is much more abundant than hydrogen in molecular clouds
Indicate whether the statement is true or false
A rock held above the ground has potential energy. As the rock falls, this potential energy is converted to kinetic energy. Finally, the rock hits the ground and stays there. What has happened to the energy?
A) It is transformed back into gravitational potential energy. B) The energy goes into the ground, and as a result, the orbit of the Earth about the Sun is slightly changed. C) The energy goes to producing sound and to heating the ground, rock, and surrounding air. D) The rock keeps the energy inside it in the form of mass-energy.
A light year is defined as the distance light can travel at 3 × 10^8 m/s in one year (365 days). How far is one light year in kilometers? Enter your answer accurate to two decimal places in scientific notation