In size and density, both Io and Europa resemble
A) our Moon. B) Pluto. C) Mars. D) Mercury. E) Charon.
A
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An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km. What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground?
a. 250 MJ c. 8770 MJ b. 478 MJ d. 10,300 MJ
There is a direct correlation between the absorption and emission spectra of a particular gas
Indicate whether the statement is true or false
What is the reason for the seasons on Earth?
a) Earth is cloest to the Sun in July, farthest from the Sun in January b) Earth is tilted with respect to the Sun by about 23.5 degrees c) Earth orbits the Sun more slowly in winter, faster in summer d) Earth rotates more slowly in winter, faster in summer e) Earth's Moon blocks more sunlight from reaching Earth in winter than in summer
What is a shock front?
A) a wave of pressure that moves faster than the speed of sound B) a wave of pressure that moves slightly slower than the speed of sound C) a wave of pressure that moves faster than the speed of light D) a wave of electromagnetic energy that can create electrical shocks E) the wave created when protons slam into electrons