Why are nearly all recently built astronomical telescopes reflectors instead of refractors?
What will be an ideal response?
Refracting telescopes suffer from chromatic aberration, which limits their usefulness, whereas reflecting telescopes do not have this problem. The primary lens of a refracting telescope is much more difficult to manufacture than a mirror of the same size, and are more expensive.
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A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car?
A) 4 m/s B) 5 m/s C) 6 m/s D) 8 m/s E) none of the above
The rings of Saturn occupy the region inside Saturn's Roche limit
Indicate whether the statement is true or false
To push a piece of heavy furniture across the carpet usually takes more force to get it moving than it takes to keep is moving. This is because
A) of Newton's first law. B) of Newton's second law. C) the static coefficient of friction is larger than the kinetic coefficient. D) the kinetic coefficient of friction is larger than the static coefficient. E) of Newton's third law.
In a certain region of space, a uniform electric field is in the x direction. A particle with negative charge is carried from x = 20.0 cm to x = 60.0 cm. The electric potential energy of the charge-field system:
1.increases. 2.remains constant. 3.decreases. 4.changes unpredictably.