If the size of our solar system were scaled down to a radius of 1 kilometer, approximately how far away would the nearest stars be on this scale?
A) several hundred kilometers
B) several million kilometers
C) several thousand kilometers
D) several billion kilometers
C
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A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The normal stress acting perpendicular to the weld is approximately:
(A) 39 MPa
(B) 48 MPa
(C) 78 MPa
(D) 84 MPa
In strength, the magnetic fields of Uranus and Neptune are
A) very different, with flopped over Uranus having no field, and Neptune a strong one. B) similar, with both about 100 times stronger than our own. C) even stronger than that of Jupiter. D) perfect fits for the Dynamo theory. E) like Jupiter and Saturn, due to mantles of liquid metallic hydrogen.
What do we mean when we say that a particle is weakly interacting?
A) It interacts with other particles only through the weakest force, gravity. B) It interacts only with other weak particles, such as neutrinos. C) It doesn't interact with any type of baryonic matter. D) It interacts with other particles only through the weak force. E) It interacts with other particles only through the weak force and the force of gravity.
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Answer the following statement true (T) or false (F)