Viscosity: Motor oil, with a viscosity of 0.25 N ? s/m2, is flowing through a tube that has a radius of 5.0 mm and is 25 cm long. The drop in pressure is 300 kPa. What is the volume of oil flowing through the tube per second?
A. 0.00038 m3/s
B. 0.025 m3/s
C. 0.0012 m3/s
D. 4.7 m3/s
E. 7.5 m3/s
Answer: C
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A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = ?2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
a. 3.2 ILB b. 5.0 ILB c. 4.2 ILB d. 3.6 ILB e. 1.0 ILB
Linear momentum is conserved in __________ collisions
Fill in the blank(s) with correct word
If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction?
(1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg) A) 0.35 kg B) 1.75 kg C) 390 kg D) 1.1 × 108 kg E) 3.3 × 108 kg
Metal lids on glass jars can often be loosened by running them under hot water. Why is this?
a. The hot water is a lubricant. b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal. c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass thus loosening the connection. d. This is just folklore.