A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify)
B. 98 N
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If a newly discovered planet has four times the mass of Earth, but it still has the same surface gravity as Earth, how big must this new planet be?
A. half the size of Earth B. the same size as Earth C. twice as large as Earth D. four times as large as Earth E. one fourth of the size of Earth
A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion
A) moves vertically. B) moves horizontally. C) is zero. D) moves along a parabolic path. E) remains in the plane.
What is the main source of benzene?
a) Benzene is obtained from coal tar, a by-product of soft coal. b) All benzene is synthetic, that is, man-made. c) Benzene is obtained from petroleum. d) Benzene forms as a product of incomplete electrolysis.
The time interval during which a nucleus has a 50% probability of decaying is its
a. half life b. decay time c. nuclei activation time d. binding energy time e. none of the above