Significant Figures: The number of significant figures in 10,001 is
A. two.
B. three.
C. five.
D. six.
Answer: C
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Currently, our best hope of finding life on extrasolar worlds is
A) by interstellar travel B) by searching with telescopes C) by listening to extraterrestrial radio broadcasts D) contact with alien visitors to the Earth
A 10-m plank with a mass of 80 kg is being moved by rolling it over two cylindrical logs, each with a mass of 10 kg and a radius of 20 cm, placed 2 m from either end of the plank
As the plank is pushed, the logs roll on the ground without slipping, and the plank does not slip on the rollers. A force of 250 N is applied to the plank. What is the speed of the plank after it has moved 2 m, starting from rest? A) 1.87 m/s B) 2.53 m/s C) 3.43 m/s D) 3.54 m/s E) 2.37 m/s
Europa's visible surface:
A) contains a very clean liquid. B) contains several craters. C) has long cracks in its icy crust. D) has a terrain resembling a liquid stream.
From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Neglect air. When they reach the ground below
A) the green ball will be moving faster than the blue ball. B) the blue ball will be moving faster than the green ball. C) the two balls will have the same speed.