Over the course of 6 hours, 15% of a radioactive material decays. What is its half-life?
a. 12.8 hrs
c. 4.1 hrs
b. 25.6 hrs
d. 68.6 hrs
B
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Converging mirrors
A. Will reflect parallel light rays to the focal point of the mirror. B. Will cause parallel light rays to spread out. C. Will reflect parallel light rays back along their original path D. Will scatter parallel light rays in random directions.
A cart is moving with a constant horizontal velocity of 5.00 m/s
A small pebble is launched from the front of the cart with a velocity of 8.00 m/s at 60.0° above the horizontal as measured relative to the cart (see figure) and experiences no significant air resistance. Just as the pebble returns to the level from which it was launched, its distance from the front of the cart is closest to A) 2.83 m. B) 4.60 m. C) 5.66 m. D) 9.19 m. E) 11.3 m.
The slope of a distance vs. time graph is the
a. distance. b. velocity. c. acceleration. d. none of the above.
Equipotential surfaces around a point charge are
a. spherical. b. cylindrical. c. planar. d. none of these choices.