Why are distant stars redder than nearby stars of the same spectral type?
What will be an ideal response?
Interstellar reddening makes stars seen through a cloud of gas and dust look redder than they should because shorter wavelength light is more easily scattered.
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A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 70,000 kg, the next one, 50,000 kg, and the last one, 80,000 kg. Neglect friction
What is the force between the 70,000-kg and 50,000-kg wagons? A) 35,000 N B) 40,000 N C) 50,000 N D) 60,000 N E) 65,000 N
At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 20.0 m/s. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?
a. 5.05 s c. 2.48 s b. 3.76 s d. 1.78 s
The angle between two plane mirrors that meet at one edge is 45°. The change in direction of a ray that strikes the first mirror at a 60° angle of incidence when that ray reflects from the second mirror is
a. 0°. b. 45° c. 90° d. 150° e. 270°
Consider a situation where a constant force of 25N acts on an object having a mass of 2 kg for 3 seconds. What is the work done by the force?
a. 150 J b. 50 J c. 75 J d. undetermined—not enough information given e. none of the above