The weak force that acts between an electron and a quark is caused by the exchange of
a. photons.
b. gluons.
c. gravitons.
d. W+, W–, or Z0 bosons.
d
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Viscosity: Glycerin, with a viscosity of 1.5 N ? s/m2, is flowing with an average speed of 1.2 m/s through a tube that has a radius of 5.0 mm and is 25 cm long. What is the drop in pressure over the length of this pipe?
A. 140 kPa B. 46 kPa C. 72 kPa D. 76 kPa E. 130 kPa
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.
A 15-kg mass, attached to a massless spring whose force constant is 2 500 N/m, has an amplitude of 4 cm. Assuming the energy is quantized, find the quantum number of the system, n, if En = nhf
a. 1.5 × 10^33 b. 3.0 × 10^33 c. 4.5 × 10^33 d. 5.4 × 10^33 e. 1.0 × 10^33
Which is the most massive star?
A. Star of 0.5 solar masses B. Coolest possible main sequence star C. Type B main sequence star D. Type G main sequence star E. Hottest possible main sequence star