The stars of highest photospheric temperature are those of spectral class _______________
a. O
b. M
c. K
d. C
a
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Determine the heat transfer through the wall of Example 2-5 if the thermal conductivity
If we had sent a radio signal to an advanced civilization in 2006 which is located in the zeta reticuli star system approximately 39 light-years away, when would the signal arrive at its destination?
A) 2006 B) 2051 C) 2039 D) 2045
Is there a force on the moon, and how do you know?
A) No, because the moon moves at an unchanging speed. B) No, because the moon is not accelerated. C) Yes, because there must be a force to keep the moon moving. D) Yes, because the moon is accelerated. E) Yes, because there must be a force pulling outward on the moon, away from Earth, to keep the moon from falling down to Earth.
A charge Q is uniformly distributed along the x axis from x = a to x = b. If Q = 45 nC, a = ?3.0 m, and b = 2.0 m, what is the electric potential (relative to zero at infinity) at the point, x = 8.0 m, on the x axis?
a. 71 V b. 60 V c. 49 V d. 82 V e. 150 V