In the Bohr model of the atom, the orbits where electrons move slowest:
a. have the least radius.
c. have the least angular momentum.
b. have the highest energy.
d. have the lowest energy.
B
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A large cast iron plate at 300ºC is suddenly subjected to a coolant at 15ºC and where the convective heat transfer coefficient is 100 W/m^2 K. For the figure shown, write the node equations for nodes 1 and 2. Then estimate T1 after 18 seconds.
Imagine that an alien spaceship crashed onto Earth. Which statement would most likely be true?
A) It would crash in the ocean. B) The aliens' home world is another planet in our own solar system. C) The crash would create a noticeable crater. D) All the evidence of the crash would be quickly whisked off by the U.S. military to Area 51 in Nevada.
The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that
A) the planets are always accelerating. B) the planets have angular momentum. C) the planets will eventually fall into the Sun. D) a force is acting on the planets.
A plane is moving due north, directly towards its destination. Its airspeed is 200 mph. A constant breeze is blowing from west to east at 42 mph. In which direction is the plane pointed?
a. 5.7° W of N c. 22° W of N b. 12° W of N d. 11° E of N