An astronaut has landed on an asteroid and conducts an experiment to determine the acceleration of gravity on that asteroid. He uses a simple pendulum that has a period of oscillation of 2
00 s on Earth and finds that on the asteroid the period is 11.3 s. What is the acceleration of gravity on that asteroid?
A) 1.74 m/s2 B) 0.0544 m/s2 C) 0.307 m/s2 D) 5.51 m/s2 E) 1.66 m/s2
C
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Why are stars no longer forming in the galactic halo?
A) Frequent supernovae blew all the halo gas out into intergalactic space. B) There was never star formation in the halo; its stars were ejected from the disk. C) Only low-mass stars formed in the halo, so there were no stellar winds or supernovae to recycle gas. D) The cold molecular gas required for star formation is in the galactic disk.
The North Celestial Pole is located ________.
A. at the center of the celestial sphere B. directly above the geographic North Pole C. at the geographic North Pole D. directly above Earth's equator E. directly overhead
When resistors are connected in parallel to a source of emf, the current through each resistor is the same
Indicate whether the statement is true or false
A 12.0-kg mass is placed on a 25.0° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580 and the coefficient of sliding friction is 0.520 . The mass is given a shove causing it to slide down the incline. Taking down the incline as positive, what is the acceleration of the mass while it is sliding?
a. -1.99 m/s2 c. -0.477 m/s2 b. 1.99 m/s2 d. 0.477 m/s2