A block of wood slides to a stop along a tabletop. In this process,
A) energy is lost.
B) both energy and energy quality remain unchanged but thermal energy is gained while kinetic energy is lost.
C) energy remains unchanged but energy quality is lost.
D) energy remains unchanged but energy quality is gained.
E) both energy and energy quality remain unchanged but thermal energy is lost while kinetic energy is gained.
C
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The sun will eventually become a supernova
Indicate whether the statement is true or false
The collapse of the iron core of an isolated massive star produces a type II supernova
a. True b. False Indicate whether the statement is true or false
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s)
A) 6.7 × 1015 B) 8.8 × 1015 C) 1.1 × 1016 D) 1.3 × 1016
A light beam is incident upon a still water surface. What is the maximum possible value for the angle of refraction? (nwater = 1.333)
a. 76.2° c. 54.4° b. 67.5° d. 48.6°