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3 years ago

10

The atomic number is equal to the number of _________ in the atom.

1 answer:

Masteriza [31]3 years ago

3 0

Answer:

Proton

Explanation:

Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.

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Waves travel along a 100-m length of string which has a mass of 55 g and is held taut with a tension of 75 N. What is the speed

Dvinal [7]

Answer:

$v=369.27\frac{m}{s}$

Explanation:

The speed of the waves in a string is related with the tension and mass per unit length of the string, as follows:

$v=\sqrt\frac{T}{\mu}$

First, we calculate the mass per unit length:

$\mu=\frac{m}{L}\\\mu=\frac{55*10^{-3}kg}{100m}\\\mu=5.5*10^{-4}\frac{kg}{m}$

Now, we calculate the speed of the waves:

$v=\sqrt\frac{75N}{5.5*10^{-4}\frac{kg}{m}}\\v=369.27\frac{m}{s}$

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4 years ago

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lana [24]

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A civil engineer plans to design a curved ramp such that a car may not have to rely on friction to round the curve without skidd

Delicious77 [7]

Answer: $\theta =\tan ^{-1}(\frac{v^2}{gR})$

Explanation:

let \theta be the inclination at which curve is tilted

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Resolving R in x and y direction we get

$R\cos \theta$ will balance weight and $R\sin \theta$ will provide the necessary centripetal Force

thus $R\sin \theta =\frac{mv^2}{R}$ ------------1

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Divide 1 & 2 we get

$\frac{R\sin \theta }{R\cos \theta }=\frac{mv^2}{mgR}$

$\tan \theta =\frac{v^2}{gR}$

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3 years ago

The size, shape, and color of an object would be an example of a

Murrr4er [49]

Answer:

physical change

Explanation:

its only changing things you see.

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