As the air cools at night the relative humidity usually drops
a. True
b. False
Indicate whether the statement is true or false
False
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Consider the situation shown below. Object A is a metal sphere with zero net charge, and objects B and C are particles with charges q and -q, respectively. Point P is at the sphere’s center. Answer each question below by choosing one of the arrows to the right of the picture or by choosing answer E. (If you are using the letters on the back cover to display your answer, you can indicate the double-letter choices by pointing to a letter with two fingers.) Which arrow best indicates the direction of the electric field at point P created by particle B?
A. A
B. B
C. C
D. D
E. Zero
F. AA
G. BB
H. CC
I. DD
Capacitors in Combination: The network shown is assembled with uncharged capacitors X , Y, and Z, with CX = 4.0 ?F, CY = 3.0 ?F and CZ = 5.0 ?F. The switches S1 and S2 are initially open, and a potential difference Vab = 120 V is applied between points a and b. After the network is assembled, switch S1 is then closed, but switch S2 is kept open. How much energy is finally stored in capacitor X?
A. 29 mJ B. 0.48 mJ C. 0.24 mJ D. 58 mJ E. 0.96 mJ
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Answer the following statement true (T) or false (F)
It takes 87 J of work to stretch an ideal spring from 1.4 m to 2.9 m from equilibrium. What is the value of the spring constant of this spring?
A) 27 N/m B) 77 N/m C) 52 N/m D) 39 N/m