Physics Acceleration - 5030 Words

Chapter 6. Uniform Acceleration Problems: Speed and Velocity 6-1. A car travels a distance of 86 km at an average speed of 8 m/s. How many hours were required for the trip? [pic] [pic] t = 2.99 h 6-2. Sound travels at an average speed of 340 m/s. Lightning from a distant thundercloud is seen almost immediately. If the sound of thunder reaches the ear 3 s later, how far away is the storm? [pic] t = 58.8 ms 6-3. A small rocket leaves its pad and travels a distance of 40 m vertically upward before returning to the earth five seconds after it was launched. What was the average velocity for the trip? [pic] v = 16.0 m/s 6-4. A car travels along a U-shaped curve for a distance of 400 m in 30†¦show more content†¦For Problem 6-17, what is the maximum displacement from the bottom and what is the velocity 4 s after leaving the bottom? (Maximum displacement occurs when vf = 0) 2as = vo2 - vf2; [pic]; s = +21.3 m vf = vo + at = 16 m/s = (-6 m/s2)(4 s); vf = - 8.00 m/s, down plane 6-19. A monorail train traveling at 80 km/h must be stopped in a distance of 40 m. What average acceleration is required and what is the stopping time? ( vo = 80 km/h = 22.2 m/s) 2as = vo2 - vf2; [pic]; a = -6.17 m/s2 [pic] ; t = 3.60 m/s Gravity and Free-Falling Bodies 6-20. A ball is dropped from rest and falls for 5 s. What are its position and velocity? s = vot +  ½at2; s = (0)(5 s) +  ½(-9.8 m/s2)(5 s)2 ; s = -122.5 m vf = vo + at = 0 + (-9.8 m/s2)(5 s); v = -49.0 m/s 6-21. A rock is dropped from rest. When will its displacement be 18 m below the point of release? What is its velocity at that time? s = vot +  ½at2; (-18 m) = (0)(t) +  ½(-9.8 m/s2)t2 ; t = 1.92 s vf = vo + at = 0 + (-9.8 m/s2)(1.92 s); vf = -18.8 m/s 6-22. A woman drops a weight from the top of a bridge while a friend below measures the time to strike the water below. What is the height of the bridge if the time is 3 s? s = vot +  ½at2 = (0) +  ½(-9.8 m/s2)(3 s)2; s = -44.1 m 6-23. A brick is given an initial downward velocity of 6 m/s. What is its final velocity after falling a distance of 40 m? 2as = vo2 - vf2 ; [pic]; v = (28.6 m/s;Show MoreRelatedAngular Projectile Motion Essay775 Words   |  4 Pagesangular projectile motion problems, one must consider the following steps. To begin with one must calculate the horizontal acceleration of the object, keeping in mind that the vertical acceleration is 9.8 m/s2 due to gravity. In most cases one is given the angle of the ramp to the horizontal, and the velocity. If not given, the velocity can be calculated using the object’s acceleration at a given moment in time. 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