A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
a. 7.0 N
b. 2.0 N
c. 3.1 N
d. 5.1 N
e. 6.6 N
C
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When a low mass star first runs short of hydrogen in its core, it becomes brighter because
A) its outer, cooler layers are shed, and we see the brighter central core. B) it explodes as a nova. C) the core contracts, raising the temperature and extending the hydrogen burning shell outward. D) the helium flash increases the size of the star immensely. E) helium fusion gives off more energy than does hydrogen.
A certain electric furnace consumes 24 kW when it is connected to a 240-V line. What is the resistance of the furnace?
A) 1.0 k? B) 10 ? C) 2.4 ? D) 0.42 ? E) 100 ?
For two beams of light traveling different distances in reaching a point, and to form maximum constructive interference at that point, the beams must travel paths that differ by a whole number of wavelengths
Indicate whether the statement is true or false
Mercury and the Earth have about the same average density, but Mercury's core is much larger, compared to the size of the body
Indicate whether the statement is true or false