The three periods are of equal length, 15 seconds. Motion that can be divided up into three periods: an initial period of (constant)Īcceleration, a period of constant velocity, and a period of (constant) negativeĪcceleration. Problems (attempt them all): 1) The Montreal green-line metro, travelling between the McGill and Peel stops, has Rank the three situations in order of ascending work (ie, smallest InĮach case, the block is moving at constant velocity v to the right (the force F is not the In the drawing below, the same force F pushes in different ways on the block. In the circle is the tension in the rope the greatest, and why? Assume that the speed of the ball in the circle is constant. You’ve seen your instructor in class whirl a ball around in a vertical circle on theĮnd of a rope. Remember that the book is in contact with the books both below and above it! There is friction between the books.ĭraw a free-body diagram of the forces on the 4th book, with all the forces clearly labeled. You want to pull a book out from the stack by applying a horizontal forceį, and you choose the 4th book down from the top. Imagine a vertical stack of books – all identical – lying on a table, as shown in theĭiagram below. Draw the free-body diagram of the elevator, and state theĭirection of the net force if it is non-zero. An elevator suspended by a cable is moving upwards towards the 5th floor of aīuilding and slowing to a stop. Which projectile, A or B, spends more time in the air? Explain your reasoning. Of projectile B (of course, both angles are less than 90o). Projectile A, the cannon is tilted upwards from the horizontal at an angle that is twice that Two projectiles are fired from a cannon, as shown in the drawing below. Ground first, or will they hit at the same? Explain your reasoning. Horizontally at the same altitude as the balloon also drops a stone. Stone is dropped from the basket of the balloon. A hot-air balloon is rising vertically upwards. Answer in a few words, a short phrase, or a simple sketch. Good luck! Short answer questions (answer all): you should not need to do any calculationsįor these questions. Put all answers in the answer booklets provided, and return this exam with your The short answer problems are worth four points each, and the problems are worth 10 pointsĮach. Explain your reasoning and show all your work!
There is a formula sheet at the back of this exam.Īttempt all the questions and problems. The exam comprises two parts on a total of four pages: 6 short-answer questions, and 5 Ragan REPRODUCTION and COMMERCIAL PHYS 101 MIDTERM October 21st, 2013
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