Constant Angular Acceleration: How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s2?
A. 4.35 s
B. 5.30 s
C. 9.57 s
D. 10.6 s
E. 63.1 s
Answer: B
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Refracting Telescope: Mary builds a simple refracting telescope using two lenses of focal length 80 cm and 5.0 cm. The respective diameters are 60 mm and 10 mm. How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the "naked eye"?
Fill in the blank(s) with the appropriate word(s).
A spaceship traveling at 0.50c away from Earth launches a secondary rocket in the forward direction at 0.50c relative to the spaceship. As measured by Earthlings, how fast is the secondary rocket moving away from Earth?
A) 0.90c B) 0.50c C) 0.80c D) 0.70c E) c
If a star's pressure increases in its interior to push the star outward, its temperature will drop, causing the star to contract and eventually return to equilibrium
a. True b. False Indicate whether the statement is true or false
For measuring the distances to galaxies within 17 Mpc, we rely primarily on ________ variable stars
Fill in the blank(s) with correct word