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Circuits to Optics June 16, 2004 Circular Motion 2 A ball attached to a string is moved at constant speed in a horizontal circular path. A target is located near the path of the ball as shown in the diagram. At which point along the ball’s path should the string be released, if the ball is to hit the target? A) A B) B C) C D) D 3 An artificial satellite makes 4 complete revolutions about the Earth in 8 hours. The period of revolution of the satellite is A) ½ hour B) 2 hours C) 8 hours D) 32 hours 4 Centripetal Acceleration & Force 5 The diagram below shows the elliptical orbit of a comet around the Sun. The magnitude of the centripetal acceleration of the comet is greatest at point A) A B) B C) C D) D 6 A car moves with a constant speed in a clockwise direction around a circular path of radius r, as represented in the diagram above. When the car is in the position shown, its acceleration is directed toward the A) north B) west C) south D) east 7 Thermodynamics 8 What is the boiling point of water at standard pressure on the Kelvin scale? A. 100 K B. 212 K C. 273 K D. 373 K 9 A thermometer is dipped into alcohol and the alcohol is allowed to evaporate from the thermometer. As the alcohol evaporates, the temperature reading of the thermometer A. decreases B. increases C. remains the same 10 Which type of field is present near a moving electric charge? (A) an electric field, only (B) a magnetic field, only (C) both an electric field and a magnetic field (D) neither an electric field nor a magnetic field The electric circuit consists of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable resistor, R2. At what value must the variable resistor be set to produce a current of 1.0 ampere through R1? (A) 6.0 Ω (B) 3.0 Ω (C) 9.0 Ω (D) 12 Ω A physics student notices that 4.0 waves arrive at the beach every 20 seconds. The frequency of these waves is (A) 0.20 Hz (B) 16 Hz (C) 5.0 Hz (D) 80 Hz An electric guitar is generating a sound of constant frequency. An increase in which sound wave characteristic would result in an increase in loudness? (A) speed (B) period (C) wavelength (D) amplitude Which diagram best represents magnetic field lines around a bar magnet? A laser beam is directed at the surface of a smooth, calm pond. Which organisms could be illuminated by the laser light? (A) the bird and the fish (B) the crab and the seaweed (C) the bird and the seaweed (D) the crab and the fish A photon of which electromagnetic radiation has the most energy? (A) ultraviolet (B) x ray (C) infrared (D) microwave What is the reading on ammeter A? (A) 1.3 A (C) 3.0 A (B) 1.5 A (D) 0.75 A Two pulses are traveling toward each other in a uniform medium. Which diagram best represents the medium when the pulses meet at point X? (A) (B) (C) (D) A mass, M, is hung from a spring and reaches equilibrium at position B. The mass is then raised to position A and released. The mass oscillates between positions A and C. At which position, A, B, or C, is mass M located when the kinetic energy of the system is at a maximum? A mass, M, is hung from a spring and reaches equilibrium at position B. The mass is then raised to position A and released. The mass oscillates between positions A and C. At which position, A, B, or C, is mass M located when the gravitational potential energy of the system is at a maximum? A mass, M, is hung from a spring and reaches equilibrium at position B. The mass is then raised to position A and released. The mass oscillates between positions A and C. At which position, A, B, or C, is mass M located when the elastic potential energy of the system is at a maximum? A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance. 1/f = 1/do + 1/di 1/(15.2 cm) = 1/(45.7 cm) + 1/di 0.0658 cm-1 = 0.0219 cm-1 + 1/di 0.0439 cm-1 = 1/di 22.8 cm = di 23 A 4.00-cm tall light bulb is placed a distance of 45.7 cm from a double convex lens having a focal length of 15.2 cm. Determine the image size. (22.8 cm = di) hi/ho = - di/do hi /(4.00 cm) = - (22.8 cm)/(45.7 cm) hi = - (4.00 cm) • (22.8 cm)/(45.7 cm) hi = -1.99 cm 24 A 4.00-cm tall light bulb is placed a distance of 8.30 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance. 1/f = 1/do + 1/di 1/(15.2 cm) = 1/(8.30 cm) + 1/di 0.0658 cm-1 = 0.120 cm-1 + 1/di -0.0547 cm-1 = 1/di -18.3 cm = di 25 A 4.00-cm tall light bulb is placed a distance of 8.30 cm from a double convex lens having a focal length of 15.2 cm. Determine the image size. (di = -18.3 cm) hi/ho = - di/do hi /(4.00 cm) = - (-18.3 cm)/(8.30 cm) hi = - (4.00 cm) • (-18.3 cm)/(8.30 cm) hi = 8.81 cm 26 A 4.00-cm tall light bulb is placed a distance of 8.30 cm from a double convex lens having a focal length of 15.2 cm. Determine the image distance. 1/f = 1/do + 1/di 1/(15.2 cm) = 1/(8.30 cm) + 1/di 0.0658 cm-1 = 0.120 cm-1 + 1/di -0.0547 cm-1 = 1/di -18.3 cm= di 27 A 4.00-cm tall light bulb is placed a distance of 8.30 cm from a double convex lens having a focal length of 15.2 cm. Determine the image size. (-18.3 cm= di) hi/ho = - di/do hi /(4.00 cm) = - (-18.3 cm)/(8.30 cm) hi = - (4.00 cm) • (-18.3 cm)/(8.30 cm) hi = 8.81 cm 28