65. Which one of the following equations correctly relates uand v ?(A) 2u cos 30° = v cos 60°(B) u cos 30° = 2v cos 60°(C) 2u sin 30° = v sin 60°(D) u sin 30° = 2v sin 60°(E) u sin 30° = v cos 60°66. If the collision is elastic, then67. The acceleration due to gravity on the moon is 1/6 of its value on Earth. If an object weighs 20 N on the moon, what is its mass on Earth?68. The electric field strength at a point some distance away from a source charge does NOT depend on

PHYSICS SUBJECT TEST 2—ContinuedThe Princeton Review Practice SAT Physics Subject Test 2|47 7GO ON TO THE NEXT PAGE69. Which of the following equations best states the relationship between a material’s coefficient of volume expansion due to heating, β, and its coefficient of linear expansion, α ?(A) β = α(B) β = 3α(C) β = α+ α2(D) β = α3(E) β = 3α370. The ends of a long, taut tightrope are attached to two platforms. A tightrope artist walks along the tightrope and, upon reaching the middle, stops. Someone standing on one of the platforms grabs the rope near one end and sends a transverse wave pulse down the rope. When the pulse reaches the tightrope walker, he briefly rises upward, and the wave passes. This illustrates the fact that the wave transportsQuestions 71-72incidentbeamairglass35ºNote: The figure is not drawn to scale.The figure above shows a beam of light striking the surface of a piece of glass from the air.71. If the reflected beam and refracted beam are perpendicular to each other, what is the index of refraction of the glass?72. Let ndenote the index of refraction of the glass. If the incident light has a frequency of fwhen traveling through the air, what is the wavelength of the light when it travels through the glass?

PHYSICS SUBJECT TEST 2—Continued47 8|Cracking the SAT Physics Subject Test73. An electron that accelerates from a point near a collection of negative source charges toward a point near a collection of positive source charges experiences(A) a decrease in electrical potential energy as it moves toward a region at a lower electric potential(B) a decrease in electrical potential energy as it moves toward a region at a higher electric potential(C) an increase in electrical potential energy as it moves toward a region at a lower electric potential(D) an increase in electrical potential energy as it moves toward a region at a higher electric potential(E) no change in electrical potential energy

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