L Multiple Choice Questions 1. A crane lifts a 425 k g steel beam vertically a d
ID: 1792338 • Letter: L
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L Multiple Choice Questions 1. A crane lifts a 425 k g steel beam vertically a distance of 117 m. How much work does the if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces A) 5.8 × 105 J B) 3.4 x 105J c) 4.0 × 105 J D)4.9 x 105 2. Two unequal masses mi and m2 (m m) are connected by a light cord passing over a pulley of negligible mass, as shown in the figure. When released, the system accelerates. Friction is negligible. Which figure below gives the correct free-body diagrams for the two masses? nt m2 A) B) C) D) rt m2 m2 3. Ca car Y, and car2 have identical engines (gitng the same X, and the least massive is car Z. Which car needs to travel magmitude of force) and tires The most massive car is car reach a Three cars start from rest, and accelerate at their maximum rate the shortest distance to speed of 60 mi/hr? A) Car X C Car Z B) Car Y D) The same work required for all cars and have identical bicycles, ride up the same mountain identical both starting at the same time. Barack rides straight up the longer road that has a lower grade. Barack gets to the top before Joe resistance, who exerted less amount of power? A) Barack C) The same. 4. Two cyclists, who weigh the same mountain, and Joe rides up the B) Joe D) Not enough information to determine.Explanation / Answer
1] Force applied by crane F = M(g+a) = 425*(9.8+1.8) = 4930 N
Work done = F s = 4930*117
= 576810 J which is close to 5.8*10^5 J
option A is correct.
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