Physics 202A FINAL EXAM Chapters 1-15 Spring 2013
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1 Name: PC Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 10 points. You must show your work in a logical fashion starting with the correctly applied and clearly stated physical principles. The equations you need are on the equation sheet. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. Six different books slide off the edge of a table one at a time. The mass and speed along the table are given. Rank the books from greatest to least based upon (a)the time to hit the ground and (b)the horizontal distance from the edge of the table to the point where the book lands. You must explain your reasoning for full credit. m v m v m v m v m v m v A B C D E F v = 1m/s v = 1m/s v = 2m/s v = 2m/s v = 3m/s v = 3m/s 2. Use the data on the equation sheet to determine (a)the force Earth exerts on the moon, (b)the force the moon exerts on the Earth, (c)the acceleration of the moon in its orbit around Earth, (d)the orbital speed of the moon, and (e)the period of the moon s orbit. 1
2 3. A 1.5kg box moves back and forth on a horizontal frictionless surface between two different springs, as shown. The box is initially pressed against the spring on the left compressing it by 4.0cm. Then is released. Find the maximum compression of the spring on the right. 4. A 110kg astronaut heading to the right collides with and holds on to an 80.0kg astronaut moving upward. After the collision, they move off together at 2.20m/s at an angle of 49 as shown. Find the speed of each astronaut before the collision. v θ v 1 v 2 2
3 5. The airplane below travels horizontally staying at the same altitude and speed as it flies by the tower. The plane is shown at six different positions. Rank these from greatest to least based upon the planes (a)linear momentum, (b)kinetic energy, and (c)angular momentum. You must explain your reasoning for full credit. 6. A 3.00m-long diving board weighs 280N and is supported at a point 1.00m from the end. A diver weighing 500N stands at the free end. Find the vertical force (magnitude and direction) at the (a)support point and (b)the left end. 3
4 7. A simple pendulum has a period of 1.60s on Earth. Find the period of the pendulum on Mars where the acceleration due to gravity is 3.71m/s The waves that are an earthquake have a wavelength of 13km and vibrate ten times per minute. Find (a)the frequency of the waves and (b)the speed of the waves. 4
5 9. At the right are six objects that have different masses and different volumes. These blocks are suspended at two different depths in water by a string from a supporting rod. Rank these situations, from greatest to least, on the basis of buoyant force on the blocks by the water. You must explain your reasoning for full credit. A B C D E F M= 80 g M= 80 g 10. To make some instant coffee (yuck!) 400g of water must be heated from 20.0 C to 100 C. (a)find the energy required. (b)suppose you put in additional energy, describe what will happen. 5
T = 2.34x10 6 s = 27.2days.
Sole the following probles in the space proided Use the back of the page if needed Each proble is worth 10 points You ust show your work in a logical fashion starting with the correctly applied and clearly
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