Why is the solar nebula theory considered a theory rather than a hypothesis?
a. It has extensive evidence and explains many observations of different objects.
b. It solves the angular momentum problem, which is the main problem of Solar System formation research.
c. It is based on mathematical models and previous calculations of molecular and particle properties.
d. It is accepted by most scientists nowadays, and it is conventionally named as a theory
Ans: a. It has extensive evidence and explains many observations of different objects.
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In crystalline metals, plastic strain at low temperature is due to _____________motion.
Fill in the blank(s) with the appropriate word(s).
The temperature of an object from which no heat energy can be extracted is
a. 0? F b. 0? C c. 0? K d. 100? K e. 100? C
A rubber rod rubbed with fur becomes
A) positively charged. B) negatively charged. C) both D) neither
Two resistors of values 6.0 and 12.0 W are connected in parallel. This combination in turn is hooked in series with a 4.0-W resistor and a 24-V battery. What is the current in the battery?
a. 12 A c. 2.0 A b. 3.0 A d. 6.0 A