Radio dishes are large in order to:
A) attract funding from NASA and the NSF.
B) give greater magnification.
C) increase their angular resolution and collect the very weak radio photons.
D) increase the range of waves they can collect.
E) detect shorter waves than optical telescopes for superior resolution.
C
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Mutual Inductance: A 73-mH solenoid inductor is wound on a form that is 0.80 m long and 0.10 m in diameter. A coil having a resistance of 7.7 ? is tightly wound around the solenoid at its center. The mutual inductance of the coil and solenoid is 19 ?H. At a given instant, the current in the solenoid is 820 mA and is decreasing at the rate of 2.5 A/s. At the given instant, what is the induced current in the coil?
A. 6.2 ?A B. 4.9 ?A C. 7.4 ?A D. 8.6 ?A E. 9.9 ?A
A runner runs 10 m from the origin toward the WEST to point A. He then runs from point A 20 m more toward the WEST to point B. He then runs from point B 30 m more toward the WEST to point C. The runner's total displacement from the origin to point C is
A. 60 m toward the WEST. B. 50 m toward the WEST. C. 20 m toward the WEST. D. 10 m toward the WEST. E. 0 m.
Neptune's largest moon, Triton, orbits in a direction opposite to the direction in which Neptune rotates. Which of the following is most likely implied by this fact?
A) Triton experiences very strong tidal forces. B) Triton probably formed as the result of a giant impact. C) Triton probably was captured into orbit by Neptune. D) Triton probably formed in its current orbit around Neptune. E) Triton probably has a rocky, asteroid-like composition.
Calculate the magnitude of the flux of a constant electric field of 5.00 N/C in the z-direction, through a rectangle with area 4.00 m2 in the xy-plane
1.0 2.10.0 N·m2/C 3.20.0 N·m2/C 4.More information is needed.