Stars of type ________ should last about ten billion years on the main sequence
Fill in the blank(s) with correct word
G
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A star is in an elliptical orbit around a black hole (which can't be seen). You have been observing the motion of the star through a telescope and have followed the motion long enough to establish that it is elliptical
How can you determine on which focus of the ellipse the black hole is located?
A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?
A) zero B) 0.15 N C) 0.30 N D) 0.60 N
An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux ?B through any area completely inside the solenoid, centered on the solenoid axis but at a 45° angle to the axis so that it touches the inside of the solenoid as shown below, is
?
?
a.
A particle with charge Q is on the y axis a distance a from the origin and a particle with charge q is on the x axis a distance d from the origin. The value of d for which the x component of the force on the second particle is the greatest is:
A) 0 B) a C) sqrt(2a) D) a/2 E) a/sqrt(2)