#52 51; * A car is uniformly accelerating, having started from rest, it itteven
ID: 1580815 • Letter: #
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#52
51; * A car is uniformly accelerating, having started from rest, it itteven a total die 200 tance of 100 ft in the first 3 s, hou far in it will it travel during the firot 5 st h 600 B. 500 c. 400 D. 300 2. 200 P. 100 52.* A nass mi 1 g and a mass m2 g are 9 cm apart. A third mass b 69 ia rom m', Pind the center of mass of directly in line with mrard it, and 9 cm f the three-body systen relative to the mass n . A. 3 B. 4 D. 7 E. 9 F. 14 53.* What is the weight in pounds of a 216 lb garth astronaut, if he visits a planet hcee mass and radius are one-third that of the Barth's? A. 54 B. 72 C. 108 D. 432 B. 648 P 864 54. A 384 1b block is at rest on a long table ubere the cofficient of kinstic friction is 1/4. Attached to this block is a horizontal cord extending over a frictionlens pulley and supporting vertically a 256 1b object. If this systen accelerates through a distance of 4 ft, what is its final kinstic enargy in basic PPS unite? A. 20 B. 196 C 431.2 D: 640 B 1408 32384 55. Consider a 20 ft long plane inclined at a 37° angle with respect to the horizontal and a weight sliding don the plane. If the weight starts iron cient of linetic friction is 1/2, what is the naximun spesd in ft/s of the weight? rest and the coeffi- B. 8 c. 16 D. 64 B. 128 A. 4 P. 256 56. Consider a speck of dust located 8/ tt from the center of a record whuich is rotat ing at 45 RPH. Assuming the particie would be thrown off by any increase in rota- tional speed, find the coefficient of static friction betueen the dust and record. 4/5 C, 3/4 D. 9/16 g.17/32 · 33/64 10/11B. wo men supporting the beam between then on a cnOSSPIECE. If the beam has a length t crosspiece be placed relative to the nan at the one and such that divided among the three men? 57, A beam is carried by three men, one man at one end and the other Mhre ust the the load is equally D. L/2B P L/AExplanation / Answer
52) Center of mass = m1x1 + m2x2 + m3x3 / m1 + m2 + m3
= 1* 0 + 2*9 + 6*18 / (1 + 2 + 6)
= 14
so option F) is the correct answer
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