Define an elastic collision in terms of conservation of momentum and energy
What will be an ideal response?
In an elastic collision, the momentum and kinetic energy are conserved.
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A railroad freight car, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 60,000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15,000-kg car is preserved in the two-coupled cars after collision?
a. 20% c. 86% b. 23% d. 100%
Which of the following statements about black holes is true for an object falling into a black hole?
A) From an outside observer's viewpoint, the object falls quickly through the event horizon. B) From an outside observer's viewpoint, light from the object will become increasingly blueshifted as it approaches the event horizon. C) In the object's reference frame, the object will slow down as it falls and come to a stop just before it reaches the event horizon. D) Once the object crosses the event horizon, it can no longer communicate with anything outside the black hole.
An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year)
According to the astronaut, how long does the trip take? A) 14.4 y B) 22.7 y C) 9.34 y D) 15.0 y E) 4.20 y
What causes stars to twinkle?
A) Stars constantly vary in brightness as they expand and contract. B) Interstellar gas along the line of sight to the star absorbs different amounts of radiation. C) The human eye has difficulty seeing faint objects. D) Moving gases in Earth's atmosphere randomly bend light rays from stars.