A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J
b. 82 J
c. 85 J
d. 74 J
e. 43 J
c
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Which sequence is correct when ordered by increasing size?
a. Earth, Solar System, Milky Way Galaxy, clusters of galaxies b. Solar System, Earth, galaxy clusters, Milky Way Galaxy c. Earth, Milky Way Galaxy, Solar System, galaxy clusters d. Galaxy clusters, Solar System, Milky Way Galaxy, Earth
Which of the following is not due to tidal forces?
A) the synchronous rotation of the Moon around Earth B) the volcanos on Io (a moon of Jupiter) C) the rings of Saturn D) the grooved terrain of Enceladus (a moon of Saturn) E) the backward orbit of Triton (a moon of Neptune)
Which of the following best describes why the smaller terrestrial worlds have cooler interiors than the larger ones?
A) They were cooler when they formed. B) The smaller ones are farther from the Sun. C) They have relatively fewer radioactive elements. D) They have relatively more surface area compared to their volumes. E) They had more volcanic eruptions in the past, which released their internal heat.
How can a focus on the original cost of a product distort economic decisions?
What will be an ideal response?