At a certain point in space there is a potential of 400 V. What is the potential energy of a +2-?C charge at that point in space?
A) 80 × 10-6 J
B) 800 J
C) 400 J
D) 200 J
E) 8 × 10-4 J
E
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Rotational Kinetic Energy: A small uniform disk and a small uniform sphere are released simultaneously at the top of a high inclined plane, and they roll down without slipping. Which one will reach the bottom first?
A. the one of smallest diameter B. the one of greatest mass C. the disk D. the sphere E. They will reach the bottom at the same time.
A 40-?C charge is positioned on the x axis at x = 4.0 cm. Where should a ?60-?C charge be placed to produce a net electric field of zero at the origin?
a. ?5.3 cm b. 5.7 cm c. 4.9 cm d. ?6.0 cm e. +6.0 cm
A spaceship from another galaxy passes over the solar system directly above a radial line from the sun to the Earth. (We measure that distance to be 1.5 × 10^11 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80 c, for which ? = 5/3 . As measured on Earth it takes the spaceship 625 seconds to travel from the sun to Earth. When a scientist in the spaceship measures the
Earth-sun distance and the time it takes her to travel that distance, she finds the results are respectively a. 9.0 × 10^10 m; 375 s. b. 9.0 × 10^10 m; 625 s. c. 1.5 × 10^11 m; 625 s. d. 2.5 × 10^11 m; 625 s. e. 2.5 × 10^11 m; 1042 s.
Calculate the ground state energy (in eV) for an electron in a box (an infinite well) having a width of 0.050 nm
a. 10 b. 75 c. 24 d. 150 e. 54