If the corona is so hot, why do we have to wait for a total solar eclipse to see it?
What will be an ideal response?
It is so hot that almost all the energy it gives off, by Wien's Law, is not going to be in the visible, but the X-ray portion of the spectrum. Also, it is very low density, so there are far more atoms at 5,800 K giving off a lot of visible light than the few out in the corona.
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A solenoid of length 0.700 m having a circular cross-section of radius 5.00 cm stores 6.00 µJ of energy when a 0.400-A current runs through it. What is the winding density of the solenoid? (?0 = 4? × 10-7 T • m/A)
A) 327 turns/m B) 1080 turns/m C) 865 turns/m D) 472 turns/m E) 104 turns/m
When an atom has an electron removed, then its net charge is
A. negative. B. unchanged. C. positive. D. It is impossible to remove an electron from an atom
A uniform disk has a mass of 3.7 kg and a radius of 0.40 m. The disk is mounted on frictionless bearings and is used as a turntable. The turntable is initially rotating at 30 rpm
A thin-walled hollow cylinder has the same mass and radius as the disk. It is released from rest, just above the turntable, and on the same vertical axis. The hollow cylinder slips on the turntable for 0.20 s until it acquires the same final angular velocity as the turntable. What is the final angular momentum of the system? A) 0.93 kg • m2/s B) 1.1 kg • m2/s C) 1.3 kg • m2/s D) 1.6 kg • m2/s E) 1.9 kg • m2/s
Define instantaneous velocity