Which of the following best describes the image of a convex mirror when the object's distance from the mirror is less than the absolute value of the focal point distance?
a. real, inverted, and magnification greater than one
b. virtual, upright, and magnification greater than one
c. real, inverted, and magnification less than one
d. virtual, upright, and magnification less than one
D
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To explain retrograde motion as well as changes in planetary brightness, Ptolemy's model used ________
Fill in the blank(s) with correct word
The human eye is sensitive to light with wavelength down to 710 nm. What is the frequency of radiation at this wavelength? (1 nm = 10?9 m and c = 3.00 × 10^8 m/s)
a. 4.23E+5 Hz b. 4.42E+6 Hz c. 4.23E+14 Hz d. 4.37E+7 Hz e. 2.18E+7 Hz
A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2 . What is the magnitude of the magnetic field?
a. 5.3 mT b. 4.9 mT c. 5.1 mT d. 4.7 mT e. 3.6 mT
An 800-kHz radio signal is detected at a point 9.1 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.440 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 total power radiated by the transmitter? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 0.27 MW B) 0.32 MW C) 0.38 MW D) 0.45 MW E) 0.50 MW