M A hockey player is standing on his skates on a froze pond when an opposing player, moving with a uniforn speed of 12 m/s, skat
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Answer:
Rate of change of length as a function of time is given by
Explanation:
The length as function of time is given by
Differentiating with respect to time we get
Missing part in the exercise. Complete text:
"A hair dryer draws 14.5 A when plugged into a 120-V line. Assume direct current.
"A hair dryer draws 14.5 A when plugged into a 120-V line. Assume direct current.
(a) What is its resistance? Express your answer to two significant figures and include the appropriate units."
(b) How much charge passes through it in 11 min ? Express your answer to two significant figures and include the appropriate units.
Solution
(a) We can calculate the resistance by using Ohm's law:
Since we know that and
, we can find R:
(b) The current is equal to the quantity of charge by unit of time:
In our problem, t=11min=660 s, so we can calculate the charge passed through the hair dryer: