College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- On a hot summer day, a young girl swings on a rope above the local swimming hole (Figure 1). When she lets go of the rope her initial velocity is 2.10 m/s at an angle of 35.0 ° above the horizontal. You may want to review (Pages 99 - 101). Part A If she is in flight for 0.611 S, how high above the water was she when she let go of the rope? ? h = Imarrow_forwardHelp! An asteroid is heading towards us at 10 km/s. Scientists decide the best solution is to attach a rocket to the asteroid and fire it to change the trajectory of the asteroid. If the rocket is fired for 8 min, the scientists calculate that the new speed for the asteroid will be 21 km/s and its new trajectory will be at an angle of 25° to its original path. Part A In the process described above, what is the acceleration of the asteroid? Express your answers using two significant figures separated by a comma. Assume that the positive axis is in the direction of the initial motion of the asteroid. The final motion of the asteroid has components in the x and positive y directions only. ax ay = for Part A for Part A undo for Part A redo for Part A reset for Part A keyboard shortcuts for Part A help for Part A Review I Constants m/s2arrow_forwardarrow_forwardPart F What is the speed u of the object at the height of ((1/2)h max? Express your answer in terms of v and g. You may or may not use all of these quantities. u=arrow_forwardA particle travels along a straight line with a velocity of v = (4t — 3t²) m/s, where t is in seconds. Part A Determine the position of the particle when t = 3.6 s. s=0 when t = 0. Express your answer to three significant figures and include the appropriate units. 8 = THPA Value Submit Provide Feedback Request Answer Units ?arrow_forwardA 5.0-m-diameter merry-go-round is turning with a 3.5 s period. Part A What is the speed of a child on the rim? Express your answer in meters per second.arrow_forwardPart A A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 100 m above the glacier at a How far short of the target should it drop the package? speed of 120 m/s. Express your answer using three significant figures with the appropriate units. You may want to review (Page). For help with math skills, you may want to review: HÅ ? Mathematical Expressions Involving_Squares Value Units For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Dock jumping. Submit Request Answerarrow_forwardTo find the height of an overhead power line, you throw a ball straight upward. The ball passes the line on the way up after 0.75 s , and passes it again on the way down 1.5 s after it was tossed. Part A What is the height of the power line? Express your answer using two significant figures. h = Submit Request Answer Part B What is the initial speed of the ball? Express your answer using two significant figures. ? vo = Value Units Submit Request Answerarrow_forwardA train moving with constant velocity travels 180 m north in 14 s and an undetermined distance to the west. The speed of the train is 34 m/s. Part A Find the direction of the train's motion relative to north. Express your answer using two significant figures. ? Submit Request Answer Part B How far west has the train traveled in this time? Express your answer using two significant figures. Im Submit Request Answerarrow_forwardA Ford Mustang can accelerate from 0 to 60 mph in a time of 6.0 s. A Mini Cooper isn't capable of such a rapid start, but it can turn in a very small circle 40 ft in diameter. Part A How fast would you need to drive the Mini Cooper in this tight circle to match the magnitude of the Mustang's acceleration? Express your answer in miles per hour. V= 5 ΑΣΦ mpharrow_forwardPage The heights of a rock after t seconds, when propelled straight up with an initial speed of 80 feet per second from an initial height of 20 feet, can be modeled by the function s(t) = -16t² + 80t +20. When will the height of the rock be 50 feet? Round your answer to the nearest tenth of a second. Carrow_forwardPlease help, thank you.arrow_forwardarrow_back_iosarrow_forward_ios
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