If the distance between two asteroids is doubled, the gravitational force they exert on each other will:
A) also be doubled.
B) be half as great.
C) be one fourth as great.
D) be 1/16 as great.
E) be four times greater.
C
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Energy Density: An 800-kHz radio signal is detected at a point 9.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.23 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the average electromagnetic energy density at that point? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 2.3 × 10-13 J/m3 B. 3.3 × 10-13 J/m3 C. 4.7 × 10-13 J/m3 D. 6.6 × 10-13 J/m3 E. 9.4 × 10-13 J/m3
A circular loop of radius 0.10 m is rotating in a uniform external magnetic field of 0.20 T. Find the magnetic flux through the loop due to the external field when the plane of the loop and the magnetic field vector are
(a) parallel. (b) perpendicular. (c) at an angle of 30° with each other. What will be an ideal response?
How long does it take a wheel that is rotating at 33.3 rpm to speed up to 78.0 rpm if it has an angular acceleration of 2.15 rad/s2?
A) 20.8 s B) 4.75 s C) 10.4 s D) 2.18 s E) 5.20 s
Riders on a ferris wheel move in a circle with a speed of 4.0 m/s. As they go around, they experience a centripetal acceleration of 2.0 m/s^2 . What is the diameter of this particular ferris wheel?
A. 4.0 m B. 6.o m C. 8.0 m D. 16 m E. 24 m