Europa is located outside the Sun's habitable zone and yet may be habitable. How can this be?
A) Europa's subsurface ocean contains lots of minerals that allow water to remain liquid at much lower temperatures
B) Europa is continually being hit by comets and asteroids which keeps water beneath its surface liquid
C) Europa is tidally heated, allowing liquid water to exist beneath its icy surface
D) Europa is large enough to have appreciable heat trapped inside it to keep water beneath the surface liquid
C
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As the ball is going upwards, the velocity points __________ and the acceleration points __________
Fill in the blank(s) with correct word
A quantity of a monatomic ideal gas expands to twice the volume while maintaining the same pressure. If the internal energy of the gas were U0 before the expansion, what is it after the expansion?
a. U0 b. 2U0 c. 4U0 d. The change in temperature must also be known to answer this question.
Near our planet Earth are
A) cosmic rays. B) magnetic fields. C) both of these D) none of the above
A 1200-kg cannon suddenly fires a cannonball at What is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally
A) 2.9 m/s B) 35 m/s C) 3.5 m/s D) 3.2 m/s