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
A
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A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10^?27 kg, q = 1.6 × 10^?19 C)
a. 82 km b. 59 km c. 71 km d. 48 km e. 7.5 km
Two or more forms of the same element that have different bonding structures in the same physical phase are called
a. isobars. b. allotropes. c. isotopes. d. isomers.
Mass on a Spring: An object of mass m = 8.0 kg is attached to an ideal spring and allowed to hang in the earth's gravitational field. The spring stretches 2.2 cm before it reaches its equilibrium position. If it were now allowed to oscillate by this spring, what would be its frequency?
A. 3.4 Hz B. 0.28 × 10-3 Hz C. 0.52 Hz D. 1.6 Hz
The radioactive half-life of a material is the time for
A) half of an original quantity of the material to decay. B) its decay rate to reduce to half. C) both of these D) neither of these