If a fish in a pond looks upward at 50° to the normal, it will see
A) the pond's bottom.
B) the sky and possibly some tall surroundings.
C) only the water's surface.
D) none of the above
Answer: A
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A 2.0-cm length of wire centered on the origin carries a 20-A current directed in the positive y direction. Determine the magnetic field at the point x = 5.0 m on the x-axis
a. 1.6 nT in the negative z direction b. 1.6 nT in the positive z direction c. 2.4 nT in the negative z direction d. 2.4 nT in the negative z direction e. None of the above
One side of a normal outlet is at 120 V AC, the other side is at
A) -120 V AC. B) 0 V. C) 240 V. D) 120 V AC. E) +120 V AC.
Energy Levels: A highly ionized atom with Z = 5 has only one electron left around it, in its ground state. How much more energy is required to finish the job and have a bare nucleus?
A. 340.0 eV B. 68.0 eV C. 10.9 eV D. 13.1 eV
When Burl and Paul stand on opposite ends of a sign-painting scaffold, the tensions in the supporting ropes
A) are equal. B) depend on the relative weights of Burl and Paul. C) combine to equal zero. D) are in equilibrium.