3 years ago

Calculate the weight of a 25kg object?

Physics

1 answer:

Naily [24]3 years ago

4 0

Mass of 25 kg weight is 25/9.81 slug of mass.

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Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. If there

exis [7]

Answer:

the maximum height of Joe's ball will be 4 times Bill's ball.

Explanation:

let bill's velocity be v then Joe's velocity is 2v.

and initial velocities of both bill and Joe are 0

for Bill

$v^2-u^2= 2gh$

$h=\frac{v^2}{2gh}$

for Joe

$(2v)^2-u^2= 2gh'$

$h'=\frac{4v^2}{2g}$

thus we can write that

h'=4h

the maximum height of Joe's ball will be 4 times Bill's ball.

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3 years ago

The half-life of plutonium 239 is 24,200 years. Assume that the decay rate is proportional to the amount. Determine the amount o

kotykmax [81]

Answer:

time taken is equal to 14,156 years

Explanation:

we know,

$Y=Ae^{-kt}$

at t = 0

Y(0) = A

given that half life of plutonium 239 = 24,200

$\dfrac{A}{2}=Ae^{-kt}\\0.5=e^{-kt}\\k\times 24200 = ln(2)\\k = \dfrac{ ln(2)}{24200}$

$Y=Ae^{-kt}$

$\frac{3}{2} = e^{-kt}\\ln(1.5)=-\dfrac{ ln(2)}{24200}\times t\\t=-\dfrac{ln(1.5)\times 24200}{ ln(2)}\\t=14,156 \ years$

hence time taken is equal to 14,156 years

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Agata [3.3K]

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Explanation:

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Yes, both of them are correct.

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