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3 years ago

10

A draft is made of a plastic block with a density of 650kg/m^3, and its dimensions are 2.0mx3.0mx5.0m ,what is the raft's appare

nt weight in water?(hint:density of water=1.00x10^3kg/m^3

1 answer:

mixas84 [53]3 years ago

8 0

Weight in water = mass of block - mass of volume of displaced water

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As a box slides down a ramp, friction does 23.0 joules of work. At the bottom of the ramp, the box has 3.8 joules of kinetic ene

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The high of the ramp is 2.81[m]

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This is a problem where it applies energy conservation, that is part of the potential energy as it descends the block is transformed into kinetic energy.

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$E_{k}=0.5*m*v^{2}\\\\where:\\E_{k}=3.8[J]\\v = 2.8[m/s]\\m=\frac{E_{k}}{0.5*v^{2} } \\m=\frac{3.8}{0.5*2.8^{2} } \\m=0.969[kg]$

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