The hot spots in double-lobed radio source
a. appear to coincide with the location of the central galaxy responsible for the jets.
b. are where hot excited gas interacts with the intergalactic medium.
c. are only found near quasars.
d. produce enough visible energy to be imaged at visible wavelengths.
e. are always perpendicular to each other.
B
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During an eclipse of the Sun the high ocean tides on Earth are
A) extra high. B) extra low. C) not significantly different.
The process of boiling water tends to
A) warm the water. B) cool the water. C) both of these D) none of the above
A coil is wrapped with 300 turns of wire on the perimeter of a circular frame (radius = 8.0 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is turned on perpendicular to the plane of the coil. This field changes at a constant rate from 20 to 80 mT in a time of 20 ms. What is the magnitude of the induced emf in the coil at the instant the magnetic field has a magnitude of 50 mT?
A. 24 V B. 18 V C. 15 V D. 10 V E. 30 V
One of Galileo's strongest objections against the Earth-centered universe came from his observation of
a) The phases of Venus b) Precession of the Spin axis of our planet c) eclipse of the Sun d) the phases of the Moon E) the stars in the Milky Way