If gypsum has a hardness of 2, what statement must be true about it?
-It can only be scratched with a knife or a wire nail
-It can scratch glass
-It can be scratched with a fingernail
-It is twice as hard as talc, which has a hardness of 1
-It can be scratched with a fingernail
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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.
Which star is the hottest star?
A) M B) G C) O D) A E) Can't tell from information provided.
A 50-N object falling in air experiences 50 N of air resistance. The amount of net force on the falling object is?
A. 0 N B. 25 N C. 50 N D. 100 N
A copper wire (d 5 1.5 mm) is bent around a tube of radius R 5 0.6 m. The maximum normal strain in the wire is approximately:
(A) 1.25 3 1023
(B) 1.55 3 1023
(C) 1.76 3 1023
(D) 1.92 3 1023
