A horizontal 52-N force must be exerted for a box to slide across a flat surface at a constant velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the floor?
A) 0.11
B) 0.09
C) 0.10
D) 0.13
A
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Where does gold (the element) come from?
A) It is produced by mass transfer in close binaries. B) It is produced during the supernova explosions of high-mass stars. C) It is produced during the late stages of fusion in low-mass stars. D) It was produced during the Big Bang.
Standing at the shore of a still lake, the reflected view of scenery on the far side of the lake is the view you would see if you were upside down with your eye in the line of sight
A) where it presently is. B) at the surface of the water where the light reflects. C) directly beneath you, as far below water level as you are above. D) close to the distant shore. E) none of the above
Which of the following statements about the differences between Fermi-Dirac statistics and Bose-Einstein statistics is NOT true?
Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the intensity of the electron beam is increased, this results in:
A. X-rays being produced having longer wavelength B. X-rays being produced having higher energy C. More X-rays produced per unit time D. Faster X-rays being produced