Power: If the units of your answer are kg ? m2/s3, which of the following types of quantities could your answer be? (There could be more than one correct choice.)
A. kinetic energy
B. potential energy
C. force
D. power
E. work
Answer: D
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What is antimatter?
A) It consists of particles that are just like those of ordinary matter except with opposite properties, such as opposite charge. B) It is matter that we infer to be in space by its gravitational influence, but that we have not yet identified. C) It is a form of matter that has been hypothesized to exist but for which there is not yet any experimental evidence. D) It is the material that makes up a complete antiuniverse that is identical to our own except that it is made from antimatter instead of matter.
The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer
The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity is zero at the observer. What are the two possible axis angle settings (less than 180°) of polarizer B? A) 40° and 90° B) 40° and 130° C) 40° and 140° D) 90° and 130° E) 90° and 140°
Two long straight wires carry currents perpendicular to the xy plane. One carries a current of 50 A and passes through the point x = 5.0 cm on the x axis. The second wire has a current of 80 A and passes through the point y = 4.0 cm on the y axis. What is the magnitude of the resulting magnetic field at the origin?
a. 200 mT b. 600 mT c. 450 mT d. 300 mT e. 400 mT
Which of the following statements is incorrect?
What will be an ideal response?