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3 years ago

A cross-country skier moves 36 meters eastward, then 44

Physics

1 answer:

ivanzaharov [21]3 years ago

3 0

Answer:

Magnitude = 14 metres

Direction = eastward.

Explanation:

A cross-country skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward.

Whats the Magnitude and Direction?

The magnitude and direction will be the displacement of the cross country skier.

Let the east ward be positive and the west ward be negative.

Since the skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward. Then, that will be:

36 - 44 + 22 = 14

Since the answer is positive, the magnitude is 14 and the direction is east ward.

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How is velocity different from speed?

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Velocity, unlike speed, includes a direction.

Velocity is a vector quantity which is defined by magnitude and direction.

Speed is a scalar quantity. It is the rate at which an object moves regardless of which direction.

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3 years ago

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Two loudspeakers emit identical sound waves along the x-axis. The sound at a point on the axis has maximum intensity when the sp

EleoNora [17]

The concept required to solve this problem is related to the wavelength.

The wavelength can be defined as the distance between two positive crests of a wave.

The waves are in phase, then the first distance is

$\Delta x_1 = 20cm$

And out of the phase when

$\Delta x_2 = 30cm$

Thus the wavelength is

$\Delta x_2-\Delta x_1 = \frac{\lambda}{2}$

Here,

$\lambda =$ Wavelength

If we rearrange the equation to find it, we will have

$\lambda = 2 (\Delta x_2-\Delta x_1 )$

$\lambda= 2(30-20)$

$\lambda = 20cm$

Therefore the wavelength of the sound is 20cm.

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3 years ago

True or false compounds only have one type of element

klasskru [66]

False, Compounds can contain more than 2 elements.

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3 years ago

A proton and an electron are both accelerated to the same final speed. If λp s the de Broglie wavelength of the proton and e is

meriva

Answer:

Explanation:

The relation between the de Broglie wavelength and the momentum of the particle is given by

$\lambda =\frac{h}{m\times v}$

where, m is the mas of the particle and v be the velocity of the particle and h be the Plank's constant.

So, the de broglie wavelength of proton is given by

$\lambda _{p}=\frac{h}{m_{p}\times v}$ .... (1)

The de broglie wavelength of electron is given by

$\lambda _{e}=\frac{h}{m_{e}\times v}$ .... (2)

Divide equation (2) by equation (1), we get

$\frac{\lambda _{e}}{\lambda _{p}}=\frac{m_{p}}{m_{e}}$

As the mass of proton is much more than the mass of electron, so the de broglie wavelength of electron is more than the de Broglie wavelength of proton.

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3 years ago

A sculptor has asked you to help electroplate gold onto a brass statue. You know that the charge carriers in the ionic solution

scZoUnD [109]

Answer:

ampere = 15.95 mA

Explanation:

given data

deposit gold = 0.560 g

time = 4.70 hour = 16920 s

solution

we get here moles of gold that is

moles of gold = 0.560 g ÷ 196.967 g/mol

moles of gold = 0.0028

moles of gold = 0.0028 ( 1 Faraday / 1 mol )

moles of gold = 0.0028 Faradays

moles of gold = 0.0028 Faradays × 96500 Coulom/ faraday

moles of gold = 270.2 coulombs

and we get here ampere that is

ampere = $\frac{270.2}{16920}$

ampere = 0.01596 A

ampere = 15.95 mA

3 0

3 years ago