The proper motion of a star, its distance, and Doppler shift can give us its space velocity
Indicate whether the statement is true or false
TRUE
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Again consider the scenario from the previous problem: A sprinter named Ben has challenged a beam of light to a race in the 100-meter dash. The race is held in a stadium full of spectators
At the start signal, a laser beam is turned on at the start line, pointed down the track. At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to Ben, what happens? A) The light beam gradually pulls ahead of him and wins the race because it is going 1% of the speed of light faster than him. B) The light beam instantly finishes the race, before Ben even has a chance to start. C) The light beam moves out ahead of him at the full speed of light, winning the race easily. D) Ben wins the race and becomes a hero.
The most luminous stars in elliptical galaxies are:
A) B stars. B) O stars. C) blue supergiants. D) red giants.
Based on the H-R diagram shown above, what is the approximate surface temperature of an F star?
A) 5000 K B) 6000 K C) 7000 K D) 12,000 K
When a certain simple pendulum is set swinging, its angular displacement ? as a function of time t obeys the equation ? = 8.5° cos(2.4 s-1t). How long is the pendulum?
What will be an ideal response?