The temperature coefficient of resistivity of platinum is 3.9 × 10-3/K°. If a platinum wire has a resistance of R at room temperature (23.°C), to what temperature must it be heated in order to double its resistance to 2R?
What will be an ideal response?
279.° C
Physics & Space Science
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What will be an ideal response?
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Some students are discussing why a simple Atwood machine accelerates
Jane says that because of the unequal masses, gravity exerts a constant external torque on the two-mass and pulley system and thus its total angular momentum increases at a constant rate. Is Jane's explanation a valid one?
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A nonchemical combination of two or more substances in variable proportions is called
a. a mixture. b. a compound. c. an ion. d. a molecule.
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Describe spiral arms
What will be an ideal response?
Physics & Space Science