An electron is known to be confined to a region of width 0.10 nm
What is an approximate value for the least kinetic energy it could have, in electron-volts? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, (melectron = 9.11 × 10-31 kg)
A) 3.8 eV B) 1.1 eV C) 0.88 eV D) 17 eV E) 8.8 eV
A
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A railroad car collides with and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system
A) is the same as before. B) is half as much as before. C) is one third as much as before. D) is one fourth as much as before. E) is one quarter as much as before.
What is an SBc galaxy?
A. An unbarred spiral with tight, smooth spiral arms. B. A barred spiral with a large bulge. C. A compact spiral galaxy that is nearly featureless like an elliptical. D. A compact spiral with spiral arms in between loose and tight. E. A barred spiral with loose, lumpy spiral arms.
A straight wire that is 0.60 m long is carrying a current of 2.0 A. It is placed in a uniform magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field?
A) 30° B) 60° C) 90° D) 25° E) 35°
The orbit of the planet Jupiter is ellipse with the Sun at one focus. What is located at the other focus?
a. The asteroid belt b. Earth c. Saturn d. Jupiter e. Nothing