A 5.00-kg box slides 4.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?
A) 1.13
B) 0.587
C) 0.115
D) 0.229
E) 0.267
C
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In a superconductor, the electrical conductivity is infinite below the _________temperature.
Fill in the blank(s) with the appropriate word(s).
Which of these is the same for all forms of electromagnetic (E-M) radiation in a vacuum?
A) photon energy B) amplitude C) speed D) wavelength E) frequency
Enrico Fermi was
A) the head of the program to develop the world's first fission bomb. B) the head of the program to develop the world's first fusion bomb. C) the inventor of radiation therapy. D) the discoverer of nuclear fission. E) the head of the program to develop the world's first nuclear reactor.
In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
a. Block A has twice as much kinetic energy as block B. b. Block B has lost twice as much kinetic energy to friction as block A. c. Block B has lost twice as much kinetic energy as block A. d. Both blocks have had equal losses of energy to friction. e. No energy is lost to friction because the ground has no displacement.