Answer:
Coal mining can compromised a lot of our resources one of it is the soil. It is because it eliminates the nutrients of the soil that can affect the vegetation, it destroys the wildlife and habitat. Also, it changes permanently the topography of the area mined.
Explanation:
edge 2020 just did it !!!
d = diameter of the seat = 12 inch
we know that , 1 inch = 0.0254 m
hence
d = diameter of the seat = 12 inch = 12 (0.0254) m = 0.305 m
r = radius of seat = diameter/2 = d/2 = 0.305/2 = 0.1525 m
A = area of seat = πr²
m = mass of the person = 65 kg
g = acceleration due to gravity = 9.8 m/s²
F = force due to weight of person on the seat = mg
pressure on the seat is given as
P = F/A
P = mg/A
P = mg/(πr² )
inserting the values
P = (65 x 9.8)/((3.14) (0.1525)²)
P = 8723.1 N/m²
Answer:
c. Mercury is used in barometers because it has a high density
Explanation:
Chemical change -
It refers to any change in a chemical process , where there is formation of any new substance , is referred to as a chemical change .
The indication of any chemical change is the formation of some new substance.
Hence, from the question,
The process which does not involve chemical change is -
The use of mercury in barometer , to measure pressure , in this process no new substance is formed i.e. , now change in mercury.
Answer:
C; Corrosive
Explanation:
Corrosive is related to the word “Corroded”
Ever heard of when batteries get corroded? That’s when they get old so the acid leaks and damages the actual battery. Same thing. So the answer is C.
I hope this helps! :D
Pls give thx and brainliest if I’m right ;)
