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In-s [12.5K]
2 years ago
7

A 85-kg person stands on one leg and 90% of the weight is supported by the upper leg connecting the knee and hip joint – the fem

ur. Assuming the femur is 0.65 m long and has a radius of 2.00 cm, by how much will the bone be compressed (in meters)?
Physics
1 answer:
Maru [420]2 years ago
4 0

Answer:

The bone is compressed to 4.213*10⁻⁶ m.

Explanation:

Given that ,

Mass of the person M = 85 kg,

Length of femur L =0.65 m

Radius of femur r = 0.02 m

To find,

Compression of the bone l = ?

The Young's Modulus is given by Y= \frac{FL}{lA}

Young's modulus of human femur bone is Y = 9.4 *10⁹ Pa

Rearranging formula ,

l =\frac{FL}{YA}

Weight supported by femur bone is 85 *0.9 =76.5 Kg

Area = π r² =3.14* (0.02)² = 0.001256 m

The length of compressed bone is  

l =\frac{76.5*0.65}{9.4GPa*0.001256} =  \frac{49.725}{0.0118GPa} =4213.89 *10⁻⁹

l = 4.213*10⁻⁶ m  

The bone is compressed to 4.213*10⁻⁶ m.

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A solenoid that is 35 cm long and contains 450 circular coils 2.0 cm in diameter carries a 1.75-A current. (a) What is the magne
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Answer:

Explanation:

a )  No of turns per metre

n = 450 / .35

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b )

Magnetic field around a very long wire at a distance d is given by the expression

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= 10⁻⁷ x 2 x ( 1.75 / .01 )

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In the second case magnetic field is much less. It is due to the fact that in the solenoid magnetic field gets multiplied due to increase in the number of turns. In straight coil this does not happen .

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A 10-meter long ramp has a mechanical advantage of 5. What is the height of the ramp?
denpristay [2]
<span><span>1.       </span>If the ramp has a length of 10 and has a mechanical advantage (MA) of 5. Then we need to find the height of the ramp.
Formula:
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Since we already have the mechanical advantage and length, this time we need to find the height .
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Construction of a solar power plant is proposed for a desert area near a school. A student has hypothesized that the shade cast
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Answer:

4. The direct sunlight received by creosote bush in the desert area (in kWh/m2) during a 12 month period

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The creosote bush depends on sunlight to produce the food they require through photosynthesis. The shade from the solar panels would reduce the amount of sunlight that the bush receives. This would increase the mortality of the bush.

In order to test the hypothesis the student must record the direct sunlight received by creosote bush in the desert area (in kWh/m2) during a 12 month period. If the plants receive sunlight less than the above amount the plants should start dying. If not then the hypothesis is false.

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Answer:

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Weight on the moon = mg(moon) = (77.1×1.6268) = 125.43 N

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2 years ago
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