The nucleus of a hydrogen atom, a proton, sets up an electric field. The distance between the proton and electron is about 5.1 × 10^?11 m. What is the magnitude of the electric field at this distance from the proton? [The charge on the proton is +1.6 × 10^?19 C.]
5.5 × 10^11 N/C
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Significant Figures: The number of significant figures in 10,001 is
A. two. B. three. C. five. D. six.
A 20 turn coil of area 10 cm2 is placed in a magnetic field so that the normal to its area is in the direction of the field. If the field has a value of 0.25 T, what is the total flux through the coil?
A. 0.0
B. 
C. 
D. 
E. 
A supermassive black hole that is erupting____
a. will consume all gas and dust in the galaxy b. will heat the gas in the cluster until it all escapes c. is fed by the intergalactic gas of the cluster d. may push its accretion disk away and choke off the eruption e. will push other galaxies away from its parent galaxy
Light from an object proceeds through 3 lenses, each with magnification 2, -4, 0.2 respectively. The overall magnification is
A) 2 - 4 + 0.2 = -1.8. B) 2 x (-4 ) × 0.2 = -1.6. C) 2/(-4)/0.2 = -2.5. D) +8/5. E) +5/8.