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PHYSICS3 - [1 A 240-Volt appliance draws 15 A of current...

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[1] A 240-Volt appliance draws 15 A of current for a period of 2 hours. How much energy in kilowatt-hours does it consume? [A] 7.2 [B] 2 . 6 × 10 7 [C] 7200 [D] 3600 [E] 0.8 [2] A 100 kg person stands on a scale in an elevator. What does the scale read when the elevator is accelerating upward at 1 . 0 m/s 2 . [A] 110 N [B] 900 N [C] - 100 N [D] 100 N [E] 1100 N [3] A 1000 kg car moving North with a speed 30 m/s collides with a 2000 kg car moving East with a speed 20 m/s. What is the speed of the cars as they move together immediately after the collision? [A] 36 . 1 m/s [B] 23 . 3 m/s [C] 10 m/s [D] 50 m/s [E] 16 . 7 m/s [4] A lens has focal length +10 cm. An object is placed at a distance 20 cm to the left of the lens. The image is [A] real and 20 cm right of the lens [B] virtual and 20 cm left of the lens [C] real and 10 cm right of the lens [D] virtual and 10 cm left of the lens [E] none of these [5] A 60 W light bulb emits spherical electromagnetic waves uniformly in all directions. If 50 percent of the power input to such a light bulb is emitted as electromagnetic radiation, what is the radiation intensity at a distance of 2 . 00 m from the light bulb? [A] 4 . 8 W/m 2 [B] 1 . 2 W/m 2 [C] 2 . 4 W/m 2 [D] 15 W/m 2 [E] 0 . 6 W/m 2 [6] For the three most common types of radiation, α , β , and γ , list them in order: most penetrating first to least penetrating last. [A] β , α , γ [B] γ , α , β [C] γ , β , α [D] α , γ , β [E] β , γ , α [F] α , β , γ [7] You and I are standing on opposite sides of a tree. You cannot see me, but you can hear me speak. This happens because [A] The wavelength of light is much smaller than the frequency of sound waves. [B] The wavelength of light waves is much smaller than the wavelength of sound waves. [C] The intensity of light waves is much greater than the intensity of sound waves. [D] The wavelength of light waves is much greater than the wavelength of sound waves. [E] The speed of light waves is much greater than the speed of sound waves. [F] The frequency of light waves is much greater than the frequency of sound waves.
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24 V 1 6 9 6 3 1 1 A B [8] When the switches are arranged so the current through the battery is minimum, what is the voltage across points A and B? [A] 4 V [B] 0 V [C] 2 V [D] 24 V [E] 1 V y x loop B [9] A circular loop of wire is positioned half in and half out of a square region of uniform ~ B -field directed in the + z direction, out of the paper, as shown. To induce a counterclockwise current in this loop: [A] move it in the + y direction [B] move it in the - x direction [C] move it along the + z axis, in the same direction as ~ B .
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