Answer:
't' lies in the interval (0.2476, 4.038)
Explanation:
Given:
The function for temperature (T) as:

Now, according to the condition given in the question

or

or

or
6t>(1.4t² + 1.4)
or
(1.4t² + 1.4 - 6t) < 0
on solving the quadratic
we get the intervals as:
t = 0.2476 and t = 4.038
Therefore, the <u>'t' lies in the interval (0.2476, 4.038)</u>
14t^2-80t+28<0
7t^2-40t+14<0
Solve by quadratic:
t=[ 40+/-sqr(1600-4*7*14)]/14
=.375 or 5.340
These are the boundaries.
So the temperature is over 100 in the interval (.375, 5.340) hrs.
A. An ionic bond consists of a metal and a non-metal.
Answer: A) converting chemical energy to mechanical energy.
When a muscle contracts, it performs mechanical work. The chemical energy generated in the muscle cell gets converted to mechanical energy. The oxidation of carbohydrates and fats helps in contraction of muscles. The metabolic process generates ATP molecules which is a storehouse of energy. during contraction. These molecules break to generate energy.