Answer:

Explanation:
Given that,
Heat required, Q = 8000 J
Mass, m = 400 g
The change in temperature, 
The heat required due to change in temperature is given by :

So, the specific heat of the substance is 
Answer:
hi
Here are the answers you need
a. Romi's speed = slope of graph = 1000/15 - 0 = 66m/min
b. for 10 minute
c. I do not know the answer for this question, please forgive me
d.at 1000m from home they meet
I hope this helps you.
May god bless you and if you like this answer and think it helped you very much please mark me as brainliest because that will help me very much.
Answer:
A phenomenon!
Explanation:
That I think was observed when a Faraday cage operates to block the effects of an electric field. (RANGE SOURCE).