Which of the following statements is an explanation, not an observation?
A) Stars can shine brightly for millions of years.
B) Stars shine with energy generated by nuclear fusion in their cores.
C) More distant galaxies are moving away from us faster than nearby galaxies.
D) All planets orbit the Sun in the same direction and in nearly the same plane.
B
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The statement that "heat energy cannot be completely transformed into work" is a statement of which thermodynamic law?
A) fourth B) zeroth C) second D) third E) first
Which of following statements about the image formed by a single concave lens are true? (There could be more than one correct choice.)
A) The image is always real. B) The image is always virtual. C) The image is always inverted. D) The image is always upright. E) The image is always smaller than the object.
The quantity "strain" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to
a. MLT?1. b. ML?1T?2. c. M2L?1T?3. d. a dimensionless quantity.
A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?
a. 59 mT b. 62 mT c. 65 mT d. 68 mT e. 31 mT