Kinematics in 2 dimensions

Kinematics in 2 dimensions - Assignments 9:11 PM 4...

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Unformatted text preview: Assignments 12/5/10 9:11 PM 4. Kinematics in 2 dimensions. Part II Due: 11:59pm on Friday, October 1, 2010 Note: To understand how points are awarded, read your instructor's Grading Policy . [ Switch to Standard Assignment View] [ Print ] Problem 4.82 A rubber ball is dropped onto a ramp that is tilted at 20 the "law of reflection," which says that the ball leaves the surface at the same angle it approached the surface. The ball's next bounce is 3.0 to the right of its first bounce. , as shown in the figure . A bouncing ball obeys Part A What is the ball's rebound speed on its first bounce? Express your answer using two significant figures. ANSWER: = 4.8 Correct Problem 4.80 You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. You find the arrow stuck in the ground 50.0 away, making a 3.00 angle with the ground. Part A How fast was the arrow shot? ANSWER: 96.7 m/s Correct Page 1 of 4 Assignments 12/5/10 9:11 PM Problem 4.78 You are asked to consult for the city's research hospital, where a group of doctors is investigating the bombardment of cancer tumors with high-energy ions. The ions are fired directly toward the center of the tumor at speeds of 6.0 . To cover the entire tumor area, the ions are deflected sideways by passing them between two charged metal plates that accelerate the ions perpendicular to the direction of their initial motion. The acceleration region is 5.0 long, and the ends of the acceleration plates are 1.5 from the patient. Part A What acceleration is required to move an ion 2.0 to one side? Express your answer using two significant figures. ANSWER: 12 = 9.4×10 Correct Problem 4.62 Astronauts use a centrifuge to simulate the acceleration of a rocket launch. The centrifuge takes 40.0 from the axis. Part A What is the astronaut's tangential acceleration during the first 40.0 ? ANSWER: 0.660 Correct to speed up from rest to its top speed of 1 rotation every 1.50 . The astronaut is strapped into a seat 6.30 Page 2 of 4 Assignments 12/5/10 9:11 PM Part B How many g's of acceleration does the astronaut experience when the device is rotating at top speed? Each 9.80 of acceleration is 1 g. ANSWER: 11.3 g Correct Problem 4.36 A crankshaft with a diameter of 3.0 Part A What is the tangential acceleration of a point on the surface of the crankshaft? ANSWER: -2.31 Correct , rotating at 2800 comes to a halt in 1.90 . Part B How many revolutions does the crankshaft make as it stops? ANSWER: 44.3 Correct Problem 4.34 A car speeds up as it turns from traveling due south to heading due east. When exactly halfway around the curve, the car's acceleration is 2.60 , 40.0 north of east. Part A What is the radial component of the acceleration at that point? ANSWER: 2.59 Correct Part B What is the tangential component of the acceleration at that point? ANSWER: 0.227 Page 3 of 4 Assignments 12/5/10 9:11 PM Correct Score Summary: Your score on this assignment is 97.9%. You received 15.67 out of a possible total of 16 points. Page 4 of 4 ...
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This note was uploaded on 12/05/2010 for the course PHYSICS AS.171.103 taught by Professor Oleg during the Fall '10 term at Johns Hopkins.

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