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4 years ago

You work at a garden store for the summer, and you lift a 14 kg bag of fertilizer with a force of 227 N.

Physics

1 answer:

nika2105 [10]4 years ago

8 0

Answer:

(a) Acceleration of the bag will be a=16.214m/sec^2

(B) Weight of the bag will be 137.2 N

Explanation:

We have given mass of the bag m = 14 kg

Force with which bag is lifted = 227 N

(A) According to newtons law we force is equal to F = ma , here m is mass and a is acceleration

So $227=14\times a$

$a=16.214m/sec^2$

(b) Acceleration due to gravity $g=9.8m/sec^2$

We know that weight is given by W = mg , here m is mass and g is acceleration due to gravity

So weight $W=mg=14\times 9.8=137.2N$

So weight of the bag will be 137.2 N

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3 years ago

How do veins control the flow of blood

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3 years ago

The Achilles tendon connects the muscles in your calf to the back of your foot. When you are sprinting, your Achilles tendon alt

lesantik [10]

Answer:

(a) $\triangle l=5 mm$

(b) 0.033

Explanation:

(a)

Force F=mg where m is mass and g is acceleration due to gravity whose value is taken as $9.81 m/s^{2}$

However, for this case, the maximum force is 8 times the weight of runner hence F=8mg

Assume Young's modulus for tendon is $0.15*10^{10} N/m^{2}$

Young's modulus is given by

$E=\frac {Fl}{A\triangle l}$ and $\triangle l=\frac {Fl}{EA}$ and substituting F with 8mg we obtain $\triangle l=\frac {8mgl}{EA}$

Where E is young's modulus, l is stretched length and \triangle l is change in length

Substituting m as 70 kg, g as $9.81 m/s^{2}$ , l as 15cm=0.15 m, E as $0.15*10^{10} N/m^{2}$ and A as $110 m^{2}=0.000110 m^{2}$

$\triangle l=\frac {8*70 Kg*9.81 m/s^{2}*0.15m}{0.15*10^{10} N/m^{2} *0.00011 m^{2}}=0.004994182 m$

$\triangle l=5 mm$

(b)

Strain, $\epsilon=\frac {\triangle l}{l}$ and the fraction of tendon’s length is the ratio of change in length to the stretched length

The fraction of tendon, f is given by

$f=\frac {\triangle l}{l}$ . Substituting $\triangle l$ with 0.005m and l with 0.15m we obtain

$\epsilon=f=\frac {0.005}{0.15}=\frac {1}{30}=0.033$

Therefore, fraction of the tendon’s length is 0.033

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4 years ago

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love history [14]

Answer:

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Explanation:

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Gravitational potential energy is the energy due to the position of a body.

It is expressed as:

Gravitational potential energy = mass x acceleration due gravity x height

Increasing mass and height will cause an increase in gravitational potential energy.

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3 years ago

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Sladkaya [172]

I got the same answer as above. So she is correct.

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3 years ago