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3 years ago

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Tendons. Tendons are strong elastic fibers that attach muscles to bones. To a reasonable approximation, they obey Hooke’s law. I

n laboratory tests on a particular tendon, it was found that, when a 250-g object was hung from it, the tendon stretched 1.23 cm. (a) Find the force constant of this tendon in N>m. (b) Because of its thickness, the maximum tension this tendon can support without rupturing is 138 N. By how much can the tendon stretch without rupturing, and how much energy is stored in it at that point?

1 answer:

Zolol [24]3 years ago

7 0

Answer:

Explanation:

Given

mass of object(m)=250 gm

Stretching(x)=1.23 cm

Suppose force constant to be k

then kx=mg

$k\times 1.23\times 10^{-2}=250\times 10^{-3}\times 9.8$

$k=\frac{9.8\times 100}{4\times 1.23}$

$k=199.18 N/m$

(b)Maximum Tension is 138 N

138=kx

$x=\frac{138}{199.18}=0.692\approx 69.2 cm$

Energy stored $=\frac{kx^2}{2}=\frac{199.18\times (0.692)^2}{2}=47.80 J$

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Answer:

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v1 = 9*10^4 m/s

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3 years ago

A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a speed of 0.550 m/s. The to

Arisa [49]

Answer: 0.5 m/s

Explanation:

Given

Speed of the sled, v = 0.55 m/s

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To solve this, we would use the law of conservation of momentum

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When the man throws the rock forward

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m1 = 0.300 kg

V1 = 17.5 m/s, in the same direction of the sled with the man

m2 = 96.5 kg - 0.300 kg = 96.2 kg

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Law of conservation of momentum states that the momentum is equal before and after the throw.

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Lelechka [254]

Answer:

1. a

2. b

3. b

Explanation:

1.

Resistance is the property of a conductor to offer resistance to the flow of current. The lower the resistance better is the conductivity of wire.

We know that the resistance of a wire depends on several factor which are inter-connected by an equation as:

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2.

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julia-pushkina [17]

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Explanation:

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3 years ago

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If f(x) = -3x +4 and g(x) = 2, solve for the value of x for<br>which (fx) = g(x) is true.

maksim [4K]

Answer:

$x=-\frac{2}{3}$

Explanation:

Let:

$f(x)=-3x+4\\\\And\\\\g(x)=2$

We need to know for which value of $x$ the function $f(x)$ is equal to $g(x)$ :

$f(x)=g(x)$

Therefore, we need to solve for the previous equation for $x$ :

Replacing the values of $f(x)$ and $g(x)$ :

$-3x+4=2$

Subtract 4 from both sides:

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Divide both sides by 3:

$\frac{3x}{3} =\frac{2}{3} \\\\x=\frac{2}{3}$

Therefore the value of $x$ for which $f(x)=g(x)$ is $x=\frac{2}{3}$ .

Verify the result:

$-3(\frac{2}{3} )+4=2\\\\-2+4=2\\\\2=2$

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3 years ago