Which of the following most likely explains why Venus does not have a strong magnetic field?
A) It does not have a metallic core.
B) Its rotation is too slow.
C) It is too close to the Sun.
D) It is too large.
E) It has too thick an atmosphere.
B
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A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure. What is the magnitude of the force by the pin on the beam?
a.
94 lb
b.
88 lb
c.
63 lb
d.
75 lb
e.
150 lb
Which of the following works best for fissioning a uranium nucleus?
A) Hit it with a neutron. B) Hit it with a proton. C) Heat it up to such a high temperature that collisions cause uranium nuclei to split. D) Hit it with another uranium nucleus. E) Hit it with an electron.
Material 1 has Young's modulus Y1 and density ?1, material 2 has Young's modulus Y2 and density ?2, and material 3 has Young's modulus Y3 and density ?3 . If Y1 > Y2 > Y3 and if ?1 < ?2 < ?3, which material has the highest speed of sound?
a. material 1 b. material 2 c. material 3 d. They could all have equal speeds of sound.
Which of the following is not a meson?
a. the phi c. the pion b. the kaon d. All of the above are mesons.