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4 years ago

What do scientists use to divide the geologic time scale?

Physics

1 answer:

dmitriy555 [2]4 years ago

3 0

The use Major changes in mineral deposits in the rock layers.

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A piece of thin uniform wire of mass m and length 3b is bent into an equilaeral triangle.

Nookie1986 [14]

Answer: Option (C) is the correct answer.

Explanation:

Formula for moment of inertia is as follows.

M.I = $\frac{mass \times (length)^{2}}{3}$

Hence, moment of inertia of two rods is as follows.

M.I of two rods = $2 \times \frac{(\frac{m}{3} \times b^{2})}{3}$

= $\frac{2mb^{2}}{9}$

As third rod have no connection with vertices. So, moment of inertia of a rod along an axis passing through its center is as follows.

M.I = $\frac{mass \times (length)^{2}}{12}$

= $\frac{mb^{2}}{3 \times 12}$

= $\frac{mb^{2}}{36}$

Using parallel axis theorem moment of inertia through vertices is as follows.

$\frac{mb^{2}}{36} + mass \times \text{distance between the two axes}$

$h^{2} = b^{2} - \frac{b^{2}}{4}$

= $\frac{3b^{2}}{4}$

h = $\frac{\sqrt{3b}}{2}$

Now, we will calculate the moment of inertia of third rod about vertices is as follows.

$\frac{mb^{2}}{36} + [(\frac{m}{3}) \times 3\frac{b^{2}}{4}]$

= $mb^{2}[\frac{1}{36} + \frac{1}{4}]$

= 5 $\frac{mb^{2}}{18}$

Therefore, total moment of inertia is calculated as follows.

Total M.I = $\frac{2mb^{2}}{9} + \frac{5mb^{2}}{18}$

= $\frac{mb^{2}}{2}$

Thus, we can conclude that the moment of inertia of the wire triangle about an axis perpendicular to the plane of the triangle and passing through one of its vertices is $\frac{mb^{2}}{2}$ .

4 0

4 years ago

The gas tank of a certain luxury automobile holds 22.3 gallons according to the owner’s manual. if the density of gasoline is 0.

erik [133]

The mass of the fuel in the tank can be calculated by multiplying the volume in full tank to the density of the gasoline. First convert 22.3 gallons to ml by multiplying it with 3785.412 since the conversion factor is 1 gallon= 3785.412 ml. Then multiply the volume with the density. Since the density is in g/ml, you would get a value in grams so convert it to kg by dividing it with 1000. The convert the value in kg to lb multiply the value by 2.2. The values are 69.27 kg and 152.72 lb.

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3 years ago

You use a pulley to lift your bike to the ceiling for winter storage. when you bought the pulley, the salesman claimed that the

Artyom0805 [142]

AMA- actual machine advantage
IMA- ideal / theoretical machine advantage

Efficiency = AMA / IMA
=3 / 10
=0.3

6 0

3 years ago

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A person tosses a ball from the ground up into the air at an initial speed of 10 m/sec and an initial angle of 43◦ off the groun

Feliz [49]

Just try your best best friend everyone

7 0

3 years ago

Different _______ of light through two separate mediums causes the bending of wave fronts associated with light rays.

eimsori [14]

The different reflections of light through two separate mediums causes the bending of wave fronts associated with light rays. The reflection and refraction is caused by the medium associated with its light rays.

3 0

3 years ago