The Babcock model employs differential rotation of the solar surface and a magnetic dynamo to describe the formation of sunspots
a. True
b. False
Indicate whether the statement is true or false
True
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Carnot Engine: The "hot shot" heat engine operating between 40°C and 380°C has an efficiency that is 60% of that of an ideal Carnot engine operating between the same temperatures. If the "hot shot" engine absorbs heat at a rate of 60 kW, at what rate does it exhaust heat?
A. 36 kW B. 41 kW C. 57 kW D. 60 kW
What is the boundary of a black hole beyond which a spacecraft could not even in principle transmit a radio signal to observers outside the black hole.
When the chromosphere can be seen during a solar eclipse, it appears:
A) invisible. B) violet. C) blue. D) yellow. E) red.
At the Fermilab accelerator in Weston, Illinois, singly-charged ions with momentum 3.3 × 10^?16 kg?m/s are held in a circular orbit of radius 1.00 km by an upward magnetic field. What B field must be used to maintain the ions in this orbit? (qion = 1.60 × 10^?19 C)
a. 5.3 T b. 2.1 T c. 2.1 T d. 0.19 T e. 0.48 T