A heat engine in each cycle absorbs energy from a reservoir as heat and does an equivalent amount of work, with no other changes. This engine violates:
A. the zeroth law of thermodynamics
B. the first law of thermodynamics
C. the second law of thermodynamics
D. the third law of thermodynamics
E. none of the above
Answer: C. the second law of thermodynamics
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The higher the surface temperature of the star, the _______________ the wavelength of maximum intensity and the ____________ total radiation emitted from surface per second
a. lower, less b. higher, more c. lower, more d. higher, less
Compound Microscope: The eyepiece of a compound microscope has a focal length of 2.50 cm, and the objective has a focal length of 1.60 cm. The two lenses are separated by 14.0 cm. The microscope is used by a person with normal eyes, having a near point at 25 cm. What is the magnitude of the magnification of the microscope?
A. 72 B. 88 C. 180 D. 219 E. 115
From studies of the rotations of galaxies and dynamics of clusters, we now think that about ________ of the mass of the universe is composed of dark matter
Fill in the blank(s) with correct word
A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 turns through 2.4 revolutions during a 2.0-s time interval. What is the angular velocity at the end of this time interval?
a. 9.5 rad/s b. 9.7 rad/s c. 9.3 rad/s d. 9.1 rad/s e. 8.8 rad/s