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2 years ago

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A device for exercising the upper leg muscle is shown above, together with a schematic representation of an equivalent lever sys

tem. calculate the force exerted by the upper leg muscle to lift the mass at a constant speed.

1 answer:

yuradex [85]2 years ago

4 0

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HELP MEEEE, question number 5

Kryger [21]

Answer:

Object A will get 200 & object B will get 400 Potential Energy

Explanation:

Potential Energy = mgh (mass x gravity x height)

For Object A :-

2 (mass) x 10 (approx gravity on Earth) x 10 (distance/height)

= 200

For Object B :-

4 x 10 x 10

= 400

Hence Object B will have High Potential Force than A.

Hope it helps. Thanks

6 0

2 years ago

which best describes how magnesium (mg) and oxygen (o) bond? they form an ionic bond by exchanging two electrons. they form an i

san4es73 [151]

They form an ionic bond by exchanging two electrons.

5 0

3 years ago

Read 2 more answers

Consider a father pushing a child on a playground merry-go-round. The system has a moment of inertia of 84.4 kg · m². The father

natulia [17]

Answer:

Part a)

$KE = 101.4 J$

Part b)

$N = 0.043 revolution$

Part c)

F = 2.7 N

Explanation:

Part a)

As we know that the rotational kinetic energy of the merry go round is given as

$KE = \frac{1}{2}I\omega^2$

$KE = \frac{1}{2}84.4(\omega^2)$

here we know that

$\omega = 2\pi(\frac{14.8}{60})$

$\omega = 1.55 rad/s$

Now we have

$KE = \frac{1}{2}(84.4)(1.55^2)$

$KE = 101.4 J$

Part b)

Now we know that work done due to torque = change in kinetic energy

$W = KE_f - KE_i$

$\tau (2N\pi) = 101.4 - 0$

$375(2\pi N) = 101.4$

$N = 0.043 revolution$

Part c)

In order to stop it in four revolutions we have

$\tau(2\pi N) = \Delta KE$

$FR(2\pi N) = 101.4$

$F(1.5)(2\pi \times 4) = 101.4$

F = 2.7 N

3 0

2 years ago

Atoms of which pair of elements will form ionic bonds in a compound?

lys-0071 [83]

Answer:

The answer D ...............

6 0

3 years ago

As a freely falling object picks up downward speed, what happens to the power supplied by the gravitational force?

vitfil [10]

We will start from the definition of power in terms of the Force. Power could be described as the change of energy in an instant of time. Considering that Energy is the product between the Force and the distance traveled we would arrive at the expression

$P = \frac{E}{t}$

$P = \frac{F*h}{t}$

Here,

F = Force

h = Height

t = Time

As there is no external force, apart from the force of gravity, and this, is constant during the course of the object we will also have to be constant power and therefore this during its course will be the same. The correct answer is (1)

4 0

3 years ago