In 21,200 years from now, Thuban will once again be our north celestial pole
a. True
b. False
Indicate whether the statement is true or false
True
RATIONALE: See precession.
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State the two fundamental postulates of Einstein's Special Relativity
What will be an ideal response?
The magnetic field at a distance of 2 cm from a current carrying wire is 4 ?T. What is the magnetic field at a distance of 1 cm from the wire?
A) 2 ?T B) 4 ?T C) 6 ?T D) 8 ?T E) 10 ?T
The half-life of a radioactive substance is affected by
A) pressure. B) temperature. C) age. D) all of the above E) none of the above
Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph
a. one quarter b. one half c. the same as d. twice e. four times