A good conductor of electricity is a bad conductor of heat
Indicate whether the statement is true or false
FALSE
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Charge of uniform surface density (0.20 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2.0 m
a. 17 N/C b. 11 N/C c. 23 N/C d. 28 N/C e. 40 N/C
Energy and Momentum: On a horizontal frictionless air table, a puck runs into an ideal horizontal spring that is fastened to the table. The puck compresses the spring by 15 cm before coming to rest. During the compression process, which quantities are conserved?
A. only the momentum of the puck B. only the kinetic energy of the puck C. only the mechanical energy (kinetic plus potential) of the puck D. the momentum and the mechanical energy of the puck E. the momentum and the kinetic energy of the puck
If you are measuring the thickness of a strand of human hair, the most appropriate SI unit is the
A) kilometer. B) meter. C) centimeter. D) millimeter. E) micrometer.
If ? 1 = 4.0 V, ? 2 = 12.0 V, R1 = 4 ?, R2 = 12 ?, C = 3 ?F, Q = 18 ?C, and I = 2.5 A, what is the potential difference Va ? Vb?
a.
?30 V
b.
30 V
c.
5.0 V
d.
?5.0 V
e.
?1.0 V