A blue ball is dropped from the roof of a tall building simultaneously with the horizontal launch of a red ball. Which statement is true?
A. the red ball strikes the ground first with the higher speed
B. both balls hit the ground at the same time, but the red ball has the higher speed
C. the blue ball strikes the ground first, but with the lower speed
D. both balls hit the ground at the same time with the same speed
B. both balls hit the ground at the same time, but the red ball has the higher speed
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How long does the protostellar stage last for a star like our Sun?
A) 1 million years B) 3 million years C) 10 million years D) 30 million years E) 100 million years
A spaceship approaching an asteroid at a speed of 0.60c launches a scout rocket with speed 0.40c relative to the spaceship. At what speed is the scout rocket approaching the asteroid?
A) 0.81c B) 1.0c C) 0.76c D) 0.64c E) 0.96c
Which of the following best describes a hero image?
A. A large, banner-type image used primarily as the center image on a website's homepage. B. A lightly-colored watermark image used as a website template's background. C. A logo saved as text to avoid using an embedded font. D. An image to which you own the copyrights and can use without restriction.
What is the surface temperature of a distant star (which emits light as if it were a blackbody) where the peak wavelength is 456 nm? (Hint: The surface of the human body at 35° C has a peak wavelength of 9.41 mm). (1 nm = 10-9 m = 10-3 mm)
a. 5100 K c. 6040 K b. 4510 K d. 6360 K