Question

The specific heat capacity of a metal is
200 Jkg -1K-1. Calculate the amount of
heat energy required to raise the
temperature of 2 kg of the metal from
125°C to 325°C.
(1)
(3)
40000 J
8000 J
(2)
(4)
80000 J
2000 J​

Answer 1

Answer:

This is a classic example of finding mean and standard deviation using Z values.

From this page find the Z value corresponding to 31% area under the curve and 92% (100-8) percent area under the curve.

Math Is Fun Virtual Manipulative

Note: You'll probably be given tables to lookup in your quizzes.. they're a bit confusing. But you might as well learn how to use it.

As you know:

Z=X−μσZ=X−μσ

Put in X and Z values values twice, you'll have two linear equations. Solve them and the answer is yours!

$hi \: buddy$