The fluid to which Bernoulli's equation is applied is based on what being conserved for the fluid?
a. its momentum
c. its kinetic energy
b. its potential energy
d. its total mechanical energy
D
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Why aren't small asteroids spherical in shape?
A) The strength of gravity of small asteroids is less than the strength of the rock. B) Small asteroids have odd shapes because they were all chipped off larger objects. C) Large asteroids became spherical because many small collisions chipped off pieces until only a sphere was left; this did not occur with small asteroids.
Hubble's constant is a "constant" in that its value
A) is the same across all of space and does not change on human time scales. B) stays the same at all times. C) is a value calculated from models, and therefore not affected by observations. D) always stays the same unless the expansion rate is accelerating.
If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration of objects due to the gravitational attraction on that planet?
A) 70.4 m/s2 B) 51.4 m/s2 C) 61.2 m/s2 D) 81.0 m/s2
The prediction from special relativity that the length of a moving object will be shortened in the direction of motion is called __________
Fill in the blank(s) with correct word