How big is the nucleus of an atom?
a. about 1% of the volume of the whole atom
b. about a millionth of the volume of the whole atom
c. about a billionth of the volume of the whole atom
d. about a trillionth of the volume of the whole atom
d
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Discuss the discovery of galaxies, and the scientific debate that led astronomers to identify them as distant clouds of billions of stars
What will be an ideal response?
What is the density-wave model?
A. It is a model who puts on a show at astronomy meetings. B. It is a description of how light propagates. C. It is a theory of the origin of the Universe. D. It is a way of describing the formation of Galactic spiral arms.
A hydraulic jack is used to lift a load of weight 4000 N. The load-bearing cylinder has a radius of 4 cm, and the other piston has a radius of 1 cm. What force must be exerted on the smaller piston to support the load?
A. 100 N B. 16,000 N C. 250 N D. 1000 N E. 4000 N
How many significant figures are in the number 0.0037010?
A) four B) five C) six D) seven E) eight