What is a nuclear fission?
A. a nuclear reaction that occurs when two light elements come together
B. a nuclear reaction that occurs when a heavy element splits into lighter elements
C. a nuclear reaction that occurs when sunlight falls on radioactive substances
B. a nuclear reaction that occurs when a heavy element splits into lighter elements
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Due to the unusual thermal expansion properties of water, when a lake freezes during the winter, the water at the bottom of the lake is at ________ temperature than the water above it
A) the same B) a higher C) a lower
The buoyant force that keeps a ship afloat is an example of __________ principle
Fill in the blank(s) with correct word
A person pushes on a doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the hinges of the door. The door begins to rotate with an angular acceleration of 2.00 rad/s2
What is the moment of inertia of the door about the hinges? A) 2.00 kg?m2 B) 1.00 kg?m2 C) 12.5 kg?m2 D) 8.00 kg?m2 E) 6.40 kg?m2
Tritium has a half-life of 12.3 years. What proportion of its original radioactivity will a sample have after 6 years?
a. 0.55 c. 0.84 b. 0.60 d. 0.71