The attractive force a 70 kg person exerts on Earth is much, much smaller than the force Earth exerts on the person.
a. true
b. false
Ans: b. false
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Parallel Wires: In the figure, a rectangular current loop is carrying current I1 = 7.0 A, in the direction indicated, near a long wire carrying a current Iw. The long wire is parallel to the sides of the rectangle. The rectangle loop has length 0.80 m and its sides are 0.10 m and 0.70 m from the wire. If the net force on the loop is to have magnitude 1.7 × 10-6 N and is to be directed towards the wire, what must be the magnitude and direction (from top to bottom or from bottom to top in the sketch) of the current Iw in the wire? (?0 = 4? × 10-7 T ? m/A)
What will be an ideal response?
The distribution of the dark matter in a spiral galaxy is
A) flattened in a disk but about ten times larger than the stellar disk. B) flattened in a disk and about the same size as the stellar disk. C) approximately spherical and about ten times the size of the galaxy halo. D) predominantly concentrated in the spiral arms. E) approximately spherical and about the same size as the galaxy halo.
At what rate would the current in a 100-mH inductor have to change to induce an emf of 1000 V?
A) 100 A/s B) 1 A/s C) 1000 A/s D) 10,000 A/s E) 10 A/s
The change in entropy of 1.00 kg of water that is heated from 50°C to 100°C is (in cal/K)
a. 516 b. 312 c. 144 d. 946 e. 391