A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ? at 20°C and increases to 3.072 ? as indium just starts to melt
What is the melting point of indium? The temperature coefficient of resistivity for platinum is 3.927 × 10-3/C°.
A) 136°C B) 351°C C) 156°C D) 116°C
C
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What makes variable stars useful in determining star distances?
A. They are brighter than other stars. B. Their exact location in the H-R diagram is known. C. They are easier to spot than ordinary stars. D. Their luminosity can be determined from their pulsation period.
Current geological evidence suggests that life
A) took billions of years to appear B) appeared as soon as the Earth formed C) appeared quite early in Earth's history D) appeared relatively recently in Earth's history
Two unknown resistors A and B are connected together. When they are connected in series their combined resistance is 15 ?. When they are connected in parallel, their combined resistance is 3.3 ?. What are the resistances of A and B?
A) 15 ? and 5 ? B) 5 ? and 10 ? C) 2.5 ? and 5 ? D) 32? and 20 ? E) 10 ? and 30?
Low lying terrain adjacent to a river that will inundate from time to time is called
What will be an ideal response?