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weqwewe [10]
3 years ago
5

the polio virus is 25 nanometers in diameter. How many would fit across the head of a pin 2 millimeters in diameter

Chemistry
2 answers:
IrinaVladis [17]3 years ago
6 0
2mm=2,000,000 nm
2,000,000/25=80,000
The answer is 80,000 polio viruses
const2013 [10]3 years ago
5 0

Answer:

80,000

Explanation:

First, the diameters of both must be in the same unit. Converting the pinhead diameter from millimeter to nanometer, we get:

2mm = 2*10^6 nm

To get the number of polio viruses that fit at the head of the pin, divide the pin size by the amount of virus in nanometers:

2*10^6 = 2,000,000

2,000,000 / 25 = 80,000

This concludes that 80,000 polio viruses fit the pinhead.

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Path of an electron in a magnetic field

The force (F) on wire of length L carrying a current I in a magnetic field of strength B is given by the equation:

F = BIL

But Q = It and since Q = e for an electron and v = L/t you can show that :

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Therefore :

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If the electron enters the field at an angle to the field direction the resulting path of the electron (or indeed any charged particle) will be helical. Such motion occurs above the poles of the Earth where charges particles from the Sun spiral through the Earth's field to produce the aurorae.

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2 years ago
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katrin [286]

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its A

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eduard
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