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2 answers:
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Answer:
K = ρL²g
Explanation:
Consider L as the length of the raft inside the water when the raft is displaced through additional distance y;
Then:
F = upthrust ( restoring force) = weight of the liquid displaced.
where;
A = L²
F = ky.
Then,
Divide both sides by y
K = ρL²g
Answer:
v₁f = -5.7 cm/s
Explanation:
- Assuming no external forces acting during the collision, total momentum must be conserved, as follows:
- Rearranging terms, we have:
- We also know that the collision is elastic, so total kinetic energy must be conserved , as follows:
- Rearranging , and simplifying common terms, we have:
- Replacing by the givens, doing some algebra and dividing (4) by (2), we find the following relationship:
- Replacing the expression above in (1), as m₂ = 2*m₁, we can find the value of v₁f, as follows: