I googled the specific heat capacity for iron so it might be off to the value you might have used, bit it should be close.
We have that heat flow out of the copper sample is mathematically given as
Q=8.86809J
<h3> Heat flow</h3>
Question Parameters
- A temperature of a 0.349 kg sample of copper
- decreases from 87.0 °C to 21.0 °C.
Endothermic Reaction
It is common knowledge that an endothermic reaction is one where the system absorbs heat energy from the <em>environs</em>.
Exothermic Reaction
An exothermic reaction is one where the system releases heat energy to the <em>environs</em>.
Generally the equation for Heat is mathematically given as

Q=8.86809J
For more information on temperature visit
brainly.com/question/15267055
All elements are balanced. There are 1 Mg, 1 O, 2 Li's and 2 Cl's.
Answer:

Explanation:
Given:
- length of a steel-string,

- area of the string,

- Young's modulus of the steel,

- force of tension on the string,

We have the relation for change in length:




Answer:
C
Explanation:
Givens
m = 2 kg
F = 2 * 9.81
F = 19.62 N
x = 0.15 m
Formula
F = k*x
Solution
19.62 = k*0.15
k = 19.62/0.15
k = 130.8 which rounded to the nearest given answer is C