A string with a mass/length of 0.00200 kg/m is stretched between two points with a tension of 115 N. If the distance between the points is changed by 1.0%, then what is the percentage change of the frequency?
A. 0.50%
B. 0.75%
C. 1.00%
D. 1.25%
E. 1.50%
C. 1.00%
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A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1. The field at (0, 0, 1.0 m) is in the positive z direction. 2. The field at (0, 1.0 m, 0) is in the negative y direction. 3. The field at
(1.0 m, 0, 0) is zero. 4. The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these
A 4.0 ?F capacitor is charged to 6.0 V. It is then connected in series with a 3.0 M? resistor and connected to a 12. V battery. How long after being connected to the battery will the voltage across the capacitor be 9.0 V?
A) 5.5 s B) 8.3 s C) 11. s D) 12. s E) 17. s
A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. Assume that the angular acceleration is constant during the 5.0-s interval. How many radians does the wheel turn through during the 5.0-s interval?
A. 95 rad B. 85 rad C. 65 rad D. 75 rad E. 125 rad
What is the leading evidence for dark energy?
a. That the universe is expanding. b. That dark matter is not affected by conventional energy. c. That ordinary energy must have a complement. d. That the rate of expansion of the universe is increasing. e. The expansion of the universe is slowing down and could eventually reverse.