PHY317L Homework%209

# PHY317L Homework%209 - homework 09 FAUSAK TAYLOR Due 4:00...

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homework 09 – FAUSAK, TAYLOR – Due: Mar 24 2008, 4:00 am 1 Question 1, chap 31, sect 1. part 1 of 2 10 points In the arrangement shown in the figure, the resistor is 5 Ω and a 8 T magnetic field is directed into the paper. The separation between the rails is 8 m . Neglect the mass of the bar. An applied force moves the bar to the left at a constant speed of 7 m / s . Assume the bar and rails have negligible resistance and friction. m 1 g 7 m / s 5 Ω 8 T 8 T I 8 m Calculate the applied force required to move the bar to the left at a constant speed of 7 m / s. Answer in units of N. Question 2, chap 31, sect 1. part 2 of 2 10 points At what rate is energy dissipated in the resistor? Answer in units of W. Question 3, chap 31, sect 1. part 1 of 2 10 points The figure below shows one of the blades of a helicopter which rotates around a central hub. The vertical component of the Earth’s magnetic field is into the plane of the paper. 2 . 3 m 1 × 10 - 5 T 1 × 10 - 5 T 2 . 3 rev / s What is the magnitude of the emf E induced between the blade tip and the central hub? Answer in units of V. Question 4, chap 31, sect 1. part 2 of 2 10 points The tip of the blade is 1. charged negative. 2. charged positive. 3. charged, but sign cannot be determined. 4. uncharged. Question 5, chap 31, sect 1. part 1 of 2 10 points A straight, horizontal rod slides along parallel conducting rails at an angle with the horizon- tal, as shown below. The rails are connected at the bottom by a horizontal rail so that the rod and rails forms a closed rectangular loop. A uniform vertical field exists throughout the region. Assume: The rod remains in contact with the rails as it slides down the rails. The rod experiences no friction or air drag. The rails and rod have negligible resistance. The acceleration of gravity is 9 . 8 m / s 2 .

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homework 09 – FAUSAK, TAYLOR – Due: Mar 24 2008, 4:00 am 2 4 . 3 Ω 5 .
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