Answer:
Force = 9600N
Explanation:
If this is the right question, there should have been a question before about the what the change in the momentum of the ball was. The answer to that was 9.6kg m/s. For this part, we divide this by the time taken which was 0.001s which give us the resultant force.
resultant force = change in momentum ÷ time
= 9.6kgm/s ÷ 0.001s
= 9600N
Answer:
Explanation:
volume of each raft = cross sectional area x length
= π r² x L , r is radius of raft and L is length
= 3.14 x .19 x .19 x 6.1
= .69 m³
total volume of 10 raft = 6.9 m³
mass of raft = 6.9 x 600
= 4140 kg
Let no of person which can be balanced be n
weight of n person = 70 n
total weight = 70 n + 4140 kg
buoyant force when whole of raft is submerged in water
= volume of displaced water x density of water x g
= total volume of raft x density of water x g
= 6.9 x 1000 x g
for equilibrium
buoyant force = total weight of raft and persons
6.9 x 1000 x g = (70 n + 4140 ) x g
6900 = 4140 + 70n
70n = 2760
n = 40 approx
Answer:
Explanation:Here's link to the answer:ly/3fcEdSx
bit.
Answer:
Proof is given below
Explanation:
The length contraction is given by Δx = Δx' *√(1 - v² / c²)
where Δx' is the proper length and is measured in the frame where the object is at rest
Since the y' and z' axes are perpendicular to the direction of motion there is no contraction
So if you let V0 = Δy' * Δz' *Δx'
and V = Δy * Δz * Δx = Δy'* Δz' * Δx
Then
V = V0 * √(1 - v² / c²)
The relationship between resistance R and resistivity
is
where L is the length of the wire and A its cross section.
The radius of the wire is half the diameter:
and the cross section is
From the first equation, we can then find the length of the wire when
(copper resistivity:
)