If the south pole of one bar magnet is brought near the north pole of a second bar magnet, the two magnets will
A)
attract.
B)
repel.
A
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A stress of 210 MPa is applied to a low-carbon steel with an elastic modulus of 211 GPa. After the stress is applied and then removed, we note that the permanent strain at 0 stress is 0.1. What was the total strain when the stress was equal to 210 MPa?
What will be an ideal response?
The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective of diameter of 1.02 m
Suppose such an instrument could be mounted on a spy satellite at an elevation of 300. km above the surface of the Earth. What is the minimum separation of two objects on the ground if their images are to be clearly resolved by this lens? (Assume an average wavelength of 0.55 ?m for white light.)
When the term singularity is mentioned, the object under discussion is probably a
a. white dwarf. b. black hole. c. neutron star. d. nova.
A 2 kg ball is floating in water. The volume displaced by the ball is
A. 0.005 
B. 0.004
C. 0.003
D. 0.002
E. 0.001