(c) i. What does the area bounded by path ABCDA represent? ii. Calculate the power output of the engine. (d) Indicate below all of the processes during which heat is added to the gas in the heat engine. ____ AB ____ BC ____ CD ____ DA
59 © 2012 The College Board. Visit the College Board on the Web: . Sample Questions for Physics B 5. (10 points) As shown above, a beam of red light of wavelength 7 6.65 10 m - ¥ in air is incident on a glass prism at an angle 1 q with the normal. The glass has index of refraction n = 1.65 for the red light. When 1 40 , q = ∞ the beam emerges on the other side of the prism at an angle 4 84 . q = ∞ (a) Calculate the angle of refraction 2 q at the left side of the prism. (b) Using the same prism, describe a change to the setup that would result in total internal reflection of the beam at the right side of the prism. Justify your answer. (c) The incident beam is now perpendicular to the surface. The glass is coated with a thin film that has an index of refraction 1.38 f n = to reduce the partial reflection of the beam at this angle. i. Calculate the wavelength of the red light in the film. ii. Calculate the minimum thickness of the film for which the intensity of the reflected red ray is near zero.
60 © 2012 The College Board. Visit the College Board on the Web: . Sample Questions for Physics B 6. (10 points) The plastic cart shown in the figure above has mass 2.5 kg and moves with negligible friction on a horizontal surface. Attached to the cart is a rigid rectangular loop of wire that is 0.10 m by 0.20 m, has resistance 4.0 , W and has a mass that is negligible compared to the mass of the cart. The plane of the rectangular loop is parallel to the plane of the page. A uniform magnetic field of 2.0 T, perpendicular to and directed into the plane of the page, starts at x = 0, as shown above. (a) On the figure below, indicate the direction of the induced current in the loop when its front edge is at 0.12 m. x = Justify your answer. (b) When the front edge of the rectangular loop is at 0.12 m, x = its speed is 3.0 m s . Calculate the following for that instant. i. The magnitude of the induced current in the rectangular loop of wire ii. The magnitude of the net force on the loop (c) At a later time, the cart and loop are completely inside the magnetic field. Determine the magnitude of the net force on the loop at that time. Justify your answer.
61 © 2012 The College Board. Visit the College Board on the Web: . Sample Questions for Physics B
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- Spring '15
- Physics, AP, Harlan Hanson