Radioactive decay occurs when
A) a nucleus emits a particle spontaneously
B) bacteria and other microscopic organisms digest nuclear particles.
C) a nucleus is struck and broken into pieces by a fast moving particle.
D) an atom loses one or more orbital electrons.
E) two or more nuclei fuse together.
A
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A spherical flask, 4 m diameter with a 5 mm thick wall, is used to heat grape juice. During the heating process the outside surface of the flask is 100ºC and the inside surface is 80ºC. Estimate the thermal resistance of the flask, the heat transfer through the flask, if it is assumed that only the bottom half is heated, and the temperature distribution through the flask wall.
What will be an ideal response?
A large ice cube is 30 cm on each side. If the length of each side is increased by a factor of two, the surface area
A. increases by a factor of ½. B. increases by a factor of 2. C. increases by a factor of 4. D. increases by a factor of 8.
A series LR circuit consists of a 2.0-H inductor with negligible internal resistance, a 100-ohm resistor, an open switch, and a 9.0-V ideal power source. After the switch is closed, what is the maximum power delivered by the power supply?
A) 8.1 W B) 0.090 W C) 0.81 W D) 81 W E) 0.40 W
Why is the wire connecting your dryer to the circuit breaker in your house thicker (of greater diameter) than the wire connecting a table lamp to the electric outlet?
What will be an ideal response?