Week One Textbook Exercises for Physics

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Week One Textbook Exercises Chapter 2: Newton’s First Law of Motion (Questions 7 and 46) 7.) A space probe may be carried by a rocket into outer space. What keeps the probe moving after the rocket no longer pushes it? Answer: -Newton’s first law of motion states that an object in motion stays in motion, unless an external force is present to interrupt it. In outer space, there is no external force to slow it down, therefore, the probe keeps moving at the same speed that it was moving prior to the rocket ceasing its force. 46.) If you toss a coin straight upward while riding in a train, where does the coin land when the motion of the train is uniform along a straight-line track? When the train slows while the coin is in the air? When the train is turning? Answer: -When the train is in constant and uniform motion, the coin that is tossed should land back in your hand. If the train decreases in speed while the coin is in the air, then, conditional on the way you are facing on the train, the coin should land either to the front of you or behind you. If the train turns to the right or to the left while the coin is in the air, then the coin should land either to the right or to the left of where you tossed it. Chapter 3: Linear Motion (Questions 20 and 22) 20.) Suppose that the three balls shown start simultaneously from the tops of the hills. Which one reaches the bottom first? Explain. Answer: -Of the three balls that are rolled, the ball in the middle should reach the bottom first strictly based on the fact that it travels down a steeper slope at the beginning, resulting in a faster acceleration then the other two balls. 22.) Which is greater, an acceleration from 25 km/h to 30 km/h or one from 96 km/h to 100 km/h if both occur during the same time? Answer: -The acceleration from 25 km/h to 30 km/h is 5 km/h. The

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