Pour two liters of water at 40°C into one liter of water at 20°C and the final temperature of the two becomes
A) less than 30°C.
B) at or about 30°C.
C) more than 30°C.
Answer: C
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Observational evidence indicates that at least some gamma ray bursts are produced by
A) the supernovas of very massive stars that leave behind black holes. B) the central black hole of the Milky Way Galaxy. C) the same types of close binary systems that produce x-ray bursts. D) white dwarf supernovas in distant galaxies.
A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s b. 0.63 s c. 0.69 s d. 0.59 s e. 0.47 s
The louvered box that serves as a thermometer shelter at a weather station is known as which of the following?
What will be an ideal response?
A ferromagnetic material is magnetized by the alignment of
a. domains. b. atoms. c. single magnetic dipoles. d. poles.