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4 years ago

How should you use a heart rate monitor?

1 answer:

8 0

A heart rate monitor tests the speed of the heart, or its rate.

Simply follow the instructions, and find the rate. <span />

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How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−214.

Musya8 [376]

Answer:

There are 887.5 number of excess electrons on the each spheres.

Explanation:

It is given that, the force of repulsion between two spheres is, $F=4.57\times 10^{-21}\ N$

We know that the force of attraction or repulsion between charges is given by :

$F=\dfrac{kq^2}{r^2}$

It is assumed that the separation between the spheres is 20 cm or 0.2 m. So,

$q=\sqrt{\dfrac{Fr^2}{k}}$

$q=\sqrt{\dfrac{4.57\times 10^{-21}\times (0.2)^2}{9\times 10^9}}$

$q=1.42\times 10^{-16}\ C$

Let there are n excess electrons that must be present on each sphere. It can be given by using quantization of charge as :

$q=ne$

$n=\dfrac{q}{e}$

$n=\dfrac{1.42\times 10^{-16}}{1.6\times 10^{-19}}$

n = 887.5 electrons

So, there are 887.5 number of excess electrons on the each spheres. Hence, this is the required solution.

3 0

3 years ago

22. The law of _____________________of _____________________ says that as long as interacting objects are not influenced by outs

Mashcka [7]

The law of consevation of momentum

8 0

3 years ago

The frequency of a sound wave is determined by the ????

Alja [10]

The frequency of a sound is determined by its source. It can't change once it leaves there.

4 0

3 years ago

Assemble the electromagnetic spectrum by dragging each piece to the correct place on the wavelength scale.

777dan777 [17]

Answer:

long wave with a frequency of nos 10⁶ Hz, to radio waves

* order of 10⁸ Hz TV and FM

* in the 10⁹ to 10¹¹ Hz microwave range

* in the range of 10¹² to 10¹⁴ infrared waves, thermal energy

* in the range of 10¹⁴ visible light captured by humans

* for range 10¹⁵ to 10¹⁸ UV light

* in the range of 10¹⁶ to 10²⁰ X-rays

* for more than 10¹⁹ Hz cosmic rays

Explanation:

The electromagnetic spectrum is formed by transverse waves that are the oscillations of electric and magnetic fields

c = λ f

in general this spectrum is divided into range depending on the uses of the waves

from lower frequency to higher we have

* long wave with a frequency of nos 10⁶ Hz, corresponds to radio waves

* tv wave and modulated frequency, of the order of 10⁸ Hz, television and FM radio

* in the 10⁹ to 10¹¹ Hz microwave range

* in the range of 10¹² to 10¹⁴ infrared waves,

* in the range of 10¹⁴ visible light captured by humans

* for range 10¹⁵ to 10¹⁸ UV light

* in the range of 10¹⁶ to 10²⁰ X-rays

* for more than 10¹⁹ Hz cosmic rays

6 0

3 years ago

Find the mass of glass which has the same volume as 5.4 g of aluminium, if density of aluminum is 2700 kg/m3 and that of glass i

White raven [17]

Answer:

Mass of glass, m=5g

Explanation:

Soluton is in the attached jpg

4 0

3 years ago