What are the three key necessities for all life on Earth?
A) (1) nutrients, (2) energy, (3) liquid water
B) (1) liquid water, (2) carbon, (3) oxygen
C) (1) nutrients, (2) liquid water, (3) oxygen
D) (1) DNA, (2) mutations, (3) liquid water
E) (1) DNA, (2) liquid water, (3) oxygen
A) (1) nutrients, (2) energy, (3) liquid water
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Estimation: Which of the following is the most reasonable estimate of the number of characters (typed letters or numbers) in a 609-page book? Assume an average of 194 words per page and a reasonable average number of letters per word.
A. 5 × 105 char B. 5 × 107 char C. 5 × 106 char D. 5 × 104 char
Impulse: Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
A. smaller than the magnitude of the change in momentum of the larger mass, but not zero. B. larger than the magnitude of the change in momentum of the larger mass. C. exactly equal to the magnitude of the change in momentum of the larger mass. D. zero. E. There is not enough information to answer the question.
A small metal sphere is suspended from the conducting cover of a conducting metal ice bucket by a non-conducting thread. The sphere is given a negative charge before the cover is placed on the bucket. The bucket is tilted by means of a non-conducting material so that the charged sphere touches the inside of the bucket. Which statement is correct?
a. The negative charge remains on the metal sphere. b. The negative charge spreads over the outside surface of the bucket and cover. c. The negative charge spreads over the inside surface of the bucket and cover. d. The negative charge spreads equally over the inside and outside surfaces of the bucket and cover. e. The negative charge spreads equally over the sphere and the inside and outside surfaces of the bucket and cover.
Energy to support a reasonable total biomass of ongoing life in a Europan ocean would probably come from
A) sunlight filtering through the ice B) organic material filtering down from the surface C) deep-sea volcanic vents D) meteoroid impacts on the surface