According to the principle of equivalence, gravity is equivalent to
A) acceleration.
B) the state of free-fall.
C) net force.
D) energy.
E) velocity.
A
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A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration is
A) 0 m/s2. B) 5 m/s2. C) 10 m/s2. D) infinite. E) none of the above
An object at the center of curvature of a concave mirror forms an inverted image at the center of curvature itself
Indicate whether the statement is true or false
Why do nuclear reactions in a star occur only near its center?
What will be an ideal response?
Choose the correct explanation why does the statement make sense (or is clearly true) or does not make sense (or is clearly false): NASA will soon launch a spaceship that will photograph our Milky Way Galaxy from beyond its halo.
A. The statement doesn't make sense. NASA need to build a spaceship that able to travel close to the speed of light to get into the halo of Milky Way in reasonable time, such as hundred years. it's well beyond the current technology. B. The statement doesn't make sense. Even if NASA could build a spaceship that traveled close to the speed of light, it would take tens of thousands of years to get into the halo and then the same time for image to get back to Earth. C. The statement doesn't make sense. At the speed of the current spaceships, it would take tens of thousands of years to get into the halo of Milky Way, though reasonable time, such as hundred years, is needed for image to get back to Earth. D. The statement makes sense. If NASA can build a spaceship that will travel close the speed of light, it would take reasonable time, such as hundred years, to get into the halo to photograph the disk, and the same time for image to get back to Earth.