A thin metallic shell of radius 40 cm has a charge of -25 nC on it. At the center of the sphere is a point charge of 35 nC. What is the electric field 50 cm from the center of the shell?
A. 400 N/C outward
B. 560 N/C outward
C. 360 N/C outward
D. 360 N/C inward
E. 560 N/C inward
C. 360 N/C outward
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Our Sun is considered to be a
A) low-mass star. B) intermediate-mass star. C) high-mass star. D) brown dwarf.
Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal masses of gas. The gram-molecular mass of He is twice that of H2 . Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
a. The total internal energy of the hydrogen is the same as that of the helium. b. The total internal energy of the hydrogen is 167 times that of the helium. c. The total internal energy of the helium is 1.67 times that of the hydrogen. d. The total internal energy of the hydrogen is 3.33 times that of the helium. e. The total internal energy of the helium is 3.33 times that of the hydrogen.
What is the magnitude of the magnetic field at point P in the figure if a = 2.0 cm, b = 4.5 cm, and I = 5.0 A?
A. 87 ?T, into the paper B. 87 ?T, out of the paper C. 0.23 mT, out of the paper D. 0.23 mT, into the paper E. 23 ?T, into the paper
The Local Group consists of about ________ galaxies
Fill in the blank(s) with correct word