A +3.0-µC point charge is initially extremely far from a positive point charge Q
You find that it takes 41 J of work to bring the +3.0-µC charge to the point x = 3.0 mm, y = 0.0 mm and the point charge Q to the point x = -3.0 mm, y = 0.00 mm. What is Q? (k = …)
A) 27 pC B) 9.1 µC C) 4.6 µC D) 55 nC
B
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A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
A. ?0.21 kJ B. ?0.47 kJ C. ?0.40 kJ D. ?0.34 kJ E. ?0.69 kJ
To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water?
A) 2.3 s B) 2.6 s C) 2.9 s D) 3.2 s E) 3.6 s
The intensity level of a "Super-Silent" power lawn mower at a distance of 1.0 m is 100 dB. You wake up one morning to find that four of your neighbors are all mowing their lawns using identical "Super-Silent" mowers
When they are each 20 m from your open bedroom window, what is the intensity level of the sound in your bedroom? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 80 dB B) 104 dB C) 400 dB D) 50 dB E) 40 dB
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The angular frequency of the electromagnetic oscillations in the circuit is
a. 36.0 × 10^?4 rad/s. b. 6.00 × 10^?2 rad/s. c. 2.78 rad/s. d. 16.7 rad/s. e. 277 rad/s.