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3 years ago

11

How much must a woman weigh (force) if the pressure she exerts while standing on one foot has an area of 0.4 m2 exerts a pressur

e of 45 Pa?

2 answers:

aleksley [76]3 years ago

7 0

Why do teachers give such hard questions? anyways hopefully your question will get answered! (btw i also need the points but yeah gl!!!)

docker41 [41]3 years ago

6 0

Answer:

Explanation:

P=F/A

F=P(A)

F=45(0.4)

F=18N. HOPE IT HELPS:)

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A meteoroid is moving towards a planet. It has mass m = 0.78×109 kg and speed v1 = 4.1×107 m/s at distance R1 = 2.8×107 m from t

wariber [46]

Answer:

$PE=81.755\, J$

Explanation:

Given that:

mass of meteoroid, $m=7.8\times 10^8 \,kg$

radial distance from the center of the planet, $R= 2.8\times 10^7 m$

mass of the planet, $M=4.4\times 10^{25}\, kg$

<u>For gravitational potential energy we have:</u>

$PE=G\frac{M.m}{R}$

substituting the respective values:

$PE=6.67\times 10^{-11}\times \frac{4.4\times 10^{25}\times 7.8\times 10^8}{2.8\times 10^7}$

$PE=81.755\, J$

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3 years ago

If the force acting on a body of mass 40 k.g is doubled by how much will the acceleration change

disa [49]

Answer:

Explanation:

Ignoring friction, the acceleration will double

F = ma

2F = m(2a)

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2 years ago

If a car accelerates from a speed of 10 m/s at an acceleration of 2 m/s2 for 3s.

Flauer [41]

Answer:

$\boxed{\sf Final \ speed \ of \ the \ car = 16 \ m/s}$

Given:

Initial speed (u) = 10 m/s

Acceleration (a) = 2 m/s²

Time taken (t) = 3s

To Find:

Final speed (v) of the car

Explanation:

From equation of motion we have:

$\boxed{ \bold{v = u + at}}$

By substituting value of u, a & t in the equation we get:

$\sf \implies v = 10 + 2\times 3 \\ \\ \sf \implies v = 10 + 6 \\ \\ \sf \implies v = 16 \: m {s}^{ - 1}$

$\therefore$

Final speed (v) of the car = 16 m/s

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3 years ago

A toy balloon contains 0.75 L of helium at a pressure of 101 kPa. The balloon rises until the pressure on the balloon is 85 kPa.

Aleksandr [31]

<h3>The answer is 0.89 L</h3>

Explanation:

The new volume can be found by using the formula for Boyle's law which is

$P_1V_1 = P_2V_2$

Since we are finding the new volume

$V_2 = \frac{P_1V_1}{P_2} \\$

From the question we have

$V_2 = \frac{101000 \times 0.75}{85000} = \frac{75750}{85000} \\ = 0.89117647...$

We have the final answer as

<h3>0.89 L</h3>

Hope this helps you

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Answer:

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