When fire rages througb underbush it clears thicj growth so sunlight can reach the forest floor and encourage growth of native species. In orddr to thrive many ecosystems need fires!
Hope this helps! ;)
Answer:
The resistance will be 2×R
Explanation:
We note that the resistivity of a cylindrical wire is given by the following relation;
Where:
ρ = Resistivity of the wire
R = The wire resistance
A = Cross sectional area of the wire = π·D²/4
L = Length of the wire
Rearranging, we have;
If the length and the diameter are both cut in half, we have;
L₂ = L/2
A₂ =π·D₂²/4 =
Therefore, the new resistance, R₂ can be expressed as follows;
Hence, the new resistance R₂ = 2×R, that is the resistance will be doubled.
Answer: 17.5N
Explanation:
Given that,
spring constant (k) = 70N/m
Original length (lo) = 40 cm
New length (ln) = 15 cm
extension of spring (e) = new length - original length
i.e e = ln - lo
e = 15 cm - 40 cm
e = -25cm (the negative sign is negligible, just the same magnitude matters)
So, convert 25cm to metres
If 100cm = 1m
25cm = 25/100 = 0.25m
(Note that how hard the spring push refers to the Force, hence, find force.)
Now, apply the Hooke law (F = ke)
Force = spring constant x extension
F = 70N/m x 0.25m
F = 17.5N
Thus, the spring push with a force of 17.5N when compressed.
B) ohm,s law :electrons moving through a conductor yo create a circuit
Answer:
Th spring is compressed by distance
Explanation:
Given:
Mass of block A=
Mass of block B=
variation of coefficient of friction with x,
spring constant=k
Distance covered on frictional surface=d
Taking block A and block B as a system , there is no external force acting on the system so the momentum can b conserved in horizontal direction.
Conservation Of Momentum
Now the blocks got stick together so both of them will pass through the frictional surface and will compress the spring together.
Work done by friction
Work done by spring
So applying Work Energy Theorem before the blocks moves to the frictional surface and when the blocks comes to rest by co pressing the spring by distance x.
Work done by all the spring +work done by friction=change in kinetic Energy of the system of blocks.