A nearsighted person cannot see objects clearly beyond 70 cm (the far point). If the patient has no astigmatism and contact lenses are prescribed, what is the power of the lens required to correct the patient's vision?
a. ?0.7 diopters
b. ?1.4 diopters
c. ?2.9 diopters
d. ?7.0 diopters
e. –700 diopters
b
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The formation of our _______________ occurred about 4.6 billion years ago
Fill in the blank(s) with correct word
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
A. +2.0 J B. +20 J C. ?2.0 J D. ?20 J E. +40 J
A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop
a. 79 ?T b. 69 ?T c. 59 ?T d. 89 ?T e. 9.4 ?T
If the wavelength of sound is increased by a factor of 3, what happens to its speed and frequency?
1.Its speed increases by a factor of 3, and so does its frequency. 2.Its frequency increases by a factor of 3, but the speed stays the same. 3.Its frequency decreases by a factor of 3, but its speed stays the same. 4.Its speed decreases by a factor of 3, and so does its frequency.