The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2)
A) 0.661 m/s2
B) 9.81 m/s2
C) 1.62 m/s2
D) 3.72 m/s2
E) 0.140 m/s2
A
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An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars near the north celestial pole appear to move
a. counter clockwise around the celestial pole. b. clockwise around the celestial pole. c. from left to right. d. from right to left. e. nearly vertically upward.
In projectile motion the horizontal component of the velocity at the top of the trajectory is
A. non-zero, and less than the initial horizontal component of the velocity. B. non-zero, and equal to the initial horizontal component of the velocity C. zero D. non-zero, and greater than the initial horizontal component of the velocity
For a star of 10 solar masses, its main sequence life span will be:
A) ten times longer than our Sun's. B) about the same as the Sun's. C) only a tenth of the Sun's. D) about a hundred times less than the Sun's. E) only 1/1000th of the Sun.
A person has a near point of 40 cm and a far point of 1.0 m. When looking through lenses of focal length –1.0 m, what is the nearest an object can be to be seen clearly?
a. 29 cm b. 67 cm c. 134 cm d. 140 cm e. 68 cm