Buoyancy: A 4.7-kg solid sphere, made of metal whose density is 4000 kg/m3, hangs by a light cord. When the sphere is immersed in water, what is the tension in the cord? The density of water is 1000 kg/m3.
A. 35 N
B. 40 N
C. 46 N
D. 52 N
E. 58 N
Answer: A
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A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 ?C. At time t = 2.00 ms the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant?
A) 2.38 mA B) 4.71 mA C) 0.780 mA D) 1.53 mA E) 1.19 mA
Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the brightness
of the lightbulbs (neglect the battery’s internal resistance) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.
Neptune's blue color comes from water vapor in its upper atmosphere.
Answer the following statement true (T) or false (F)
What does E = mc2 say--that all energy has mass, or that all mass has energy?
A) All mass has energy. B) It says neither of these. C) All energy has mass. D) It says both of these.