A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10^?4 cal/s/cm/°C
a. 62
b. 74
c. 230
d. 160
e. 12
b
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Wire A is twice as long as wire B but is otherwise identical. Both have the same potential difference between their ends. How do the currents flowing in these wires compare?
A. /A = 4/B B. /A = 2/B C. /A = /B D. /A = (1/2)/B E. /A = (1/4)/B F. Other (specify) T. It is impossible to say given the provided information.
Radioactivity Basics: What are the mass number, the atomic number, and neutron number for each of the following particles?(a) proton(b) neutron(c) alpha particle
What will be an ideal response?
Which of the following best describes what we mean by the term universe?
A) the sum total of all matter and energy B) a vast collection of stars that number as many as the grains of sand on all the beaches on Earth C) all the galaxies in all the superclusters D) our Milky Way Galaxy
____ occurs when light travels out of a gravitational field, loses energy and its wavelength grows longer
a. A gravitational blue shift b. The solar wind c. A gravitational redshift d. A X-ray burst e. A pulsar wind