Dielectrics: The square plates of a 3000-pF parallel-plate capacitor measure 40 mm by 40 mm and are separated by a dielectric that is 0.29 mm thick and completely fills the region between the plates. What is the dielectric constant of the dielectric? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 61
B. 56
C. 50
D. 45
E. 67
Answer: A
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In an elastic collision between two bodies of mass m1 and m2, with m2 initially at rest, mass 1 moves off at angle q relative to the direction of its initial velocity and mass 2 at angle f. An exam paper shows the equations below: m1v1i 0 = m1v1f cosq + m2v2f sinf = m1v1f sinq + m2v2f cosf What error(s) has the student made?
a. In the first equation, m2v2f sinf should be m2v2f cosf. b. In the second equation, m2v2f cosf should be m2v2f sinf. c. In the second equation, the plus sign between the terms on the right should be a minus sign. d. All of the errors listed above. e. Only errors (a) and (b) above.
A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
A. 0; 0. B. 0; 2.38 m/s, south. C. 0; 2.38 m/s, north. D. 1 000 m, south; 2.38 m/s, south. E. 1 000 m, north; 2.38 m/s, north.
A typical meteor is created by a particle about the size of a
A) baseball. B) pea. C) car. D) basketball.
During a solar eclipse, the ________ casts a small circular shadow on the ________.
A. Sun; Moon B. Earth; Moon C. Moon; Sun D. Moon; Earth E. Earth; Sun