2 years ago

Find the magnitude of the buoyant force on the block. The acceleration of gravity is 9.8 m/s 2 . Answer in units of N.

Physics

1 answer:

harkovskaia [24]2 years ago

6 0

The answer is 2248.02 N.

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Answer:

Explanation:

Given

mass of boy=36 kg

length of swing=3.5 m

Let T be the tension in the swing

At top point $mg-T=\frac{mv^2}{r}$

where v=velocity needed to complete circular path

Th-resold velocity is given by $mg-0=\frac{mv^2}{r}$

$v=\sqrt{gr}=\sqrt{9.8\times 3.5}=5.85 m/s$

So apparent weight of boy will be zero at top when it travels with a velocity of $v=\sqrt{gr}$

To get the velocity at bottom conserve energy at Top and bottom

At top $E_T=mg\times 2L+\frac{mv^2}{2}$

Energy at Bottom $E_b=\frac{mv_0^2}{2}$

Comparing two as energy is conserved

$v_0^2=4gl+gl$

$v_0^2=5gL$

$v_0=\sqrt{5gL}=13.09 m/s$

Apparent weight at bottom is given by

$W=\frac{mv_0^2}{L}-mg=\frac{36\times 13.09^2}{3.5}+36\times 9.8=2115.23 N$

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2 years ago

The power in an electrical current is given by the equation

Tcecarenko [31]

Answer:

P = VI

Explanation:

the power is equal to the current × voltage

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Hunter wants to measure the weight of a dumbbell. He should

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Use a scale and record the weight in cm^3

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Potential energy U = mgh

Given h = 123 m,
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A box weighs 100N and its base area of 2 m2. What pressure does it exert on the ground?

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P = F/S = 100/2 =50 (N/m2)

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