The collapse of the iron core of an isolated massive star produces a type II supernova
a. True
b. False
Indicate whether the statement is true or false
True
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Rotational Kinetic Energy: A solid uniform 3.33-kg disk has thin string of negligible mass wrapped around its rim, with one end of the string tied to the ceiling, as shown in the figure. The disk is released from rest, and as it falls, it turns as the string unwraps. At the instant its center has fallen 2.25 m, (a) how fast is the center moving, and (b) how much rotational kinetic energy does the disk have?
What will be an ideal response?
Most likely, before biological evolution there was
A) chemical evolution B) physical evolution C) geological evolution D) no evolution of any kind
An inductor has a current I = 0.5A cos[( 275 s-1 ) t] . The maximum emf across the inductor is equal to 0.5 V. What is the self-inductance of the inductor?
A) 4.37 mH B) 3.64 mH C) 2.75 mH D) 0.73 mH E) 1.43 mH
By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
a. straight lines in space that go from one magnetic charge to another. b. straight lines in space that are parallel to the wire. c. straight lines in space that are perpendicular to the wire. d. circles that have their centers on the wire and lie in planes perpendicular to the wire. e. circles that have the wire lying along a diameter of the circle.