Torque: The maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is
A. 0°
B. 45°
C. 90°
D. 135°
Answer: A
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An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 8.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 680
A. 1.10 cm B. 1.20 cm C. 1.31 cm D. 1.42 cm E. 1.55 cm
In addition to the electric force law and the magnetic force law, the other key principle that is needed to explain electromagnetic waves is
A) electromagnetic forces can be felt across a distance. B) Newton's law of motion. C) electromagnetic fields are established instantaneously. D) forces always come in pairs, so for every sender of electromagnetic force there must be a receiver. E) electromagnetic fields are not established instantaneously.
The most massive and densest planets are the terrestrials
a. True b. False Indicate whether the statement is true or false
Characteristic peaks occur in an x ray spectrum of an atom because electrons in the atom make transitions to lower energy levels after being bombarded with high energy electrons
Indicate whether the statement is true or false