A person looking through eyeglasses sees
a. real images.
b. virtual images.
c. erect images.
d. inverted images.
e. polarized images.
b, c
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A real (non-Carnot) thermodynamic engine, operating between thermal energy reservoirs at temperatures of 450 K and 270 K, performs 3.3 kJ of net work, and rejects 8.2 kJ of energy in a single cycle
(a) What is the thermal efficiency of this thermodynamic engine? (b) What is the maximum efficiency it could possibly have?
Is it possible to determine the planet's mass from the star's velocity curve?
What will be an ideal response?
Two waves travel simultaneously through the same medium. The first wave is described by y1(x,t) = (2.00 cm)cos[kx-?t] and the second wave by y2(x,t) = (3.00 cm)cos(kx-?t+?). If the resulting wave has an amplitude 4
00 cm, what is a possible value of ?? A) 0.782 rad B) 0.250 rad C) 0.644 rad D) 0.833 rad E) 1.32 rad
A bird can safely land on a bare high voltage power line because
A. If both feet are touching the bare wire, they are at the same potential – and therefore no current can flow between the feet and through the bird’s body B. Its internal resistance is very high, so very little current will flow C. The line cannot deliver enough current to harm it D. Its feet are good insulators, and therefore it is protected