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4 years ago

13

What is the smallest accurate measurement that can be made with an instrument?

1 answer:

vovangra [49]4 years ago

5 0

Dependent on what you are measuring and what took you are using. Please be more specific.

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If a plane has an airspeed of 40 m/s and is experiencing a crosswind of 30 m/s, what is its ground speed in m/s?

Anon25 [30]

<h2>Answer:50 $ms^{-1}$ </h2>

Explanation:

Let $v_{a}$ be the airspeed.

Let $v_{w}$ be the cross wind speed.

We know that,ground speed is the vector sum of airspeed and cross wind speed and airspeed is perpendicular to cross wind speed.

If $v_{1}$ and $v_{2}$ are two perpendicular vectors,the resultant vector has the magnitude $\sqrt{|v|_{1}^{2}+|v|_{2}^{2}}$

Given,

$v_{a}=40ms^{-1}\\v_{c}=30ms^{-1}$

So,the ground speed is $\sqrt{40^{2}+30^{2}}=\sqrt{2500}=50ms^{-1}$

6 0

3 years ago

Pls help me with this question I want the answer ASAP quick

Sindrei [870]

Answer:

I don't know the answer

Explanation:

I just want the point sorry (\_/)

( - ×)

o o

3 0

3 years ago

What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/10 the speed of light? __

Softa [21]

Answer: $2.42(10)^{-11} m$

Explanation:

The de Broglie wavelength $\lambda$ is given by the following formula:

$\lambda=\frac{h}{p}$ (1)

Where:

$h=6.626(10)^{-34}\frac{m^{2}kg}{s}$ is the Planck constant

$p$ is the momentum of the atom, which is given by:

$p=m_{e}v_{e}$ (2)

Where:

$m_{e}=9.11(10)^{-31}kg$ is the mass of the electron

$v=\frac{1}{10}c$ is the velocity of the electron (we are told it is 1/10 the speed of light $c=3(10)^{8}\frac{m}{s}$ )

This means equation (2) can be written as:

$p=m_{e}\frac{1}{10}c$ (3)

Substituting (3) in (1):

$\lambda=\frac{h}{m_{e}\frac{1}{10}c}$ (4)

$\lambda=10\frac{h}{m_{e} c}$ (5)

Now, we only have to find $\lambda$ :

$\lambda=10\frac{6.626(10)^{-34}\frac{m^{2}kg}{s}}{(9.11(10)^{-31}kg)(3(10)^{8}\frac{m}{s})}$ (6)

<u>Finally:</u>

$\lambda=2.42(10)^{-11} m$ >>> This is the de Broglie wavelength of an electron.

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4 years ago

Who was nikola teslas partner

vesna_86 [32]

Answer:

Thomas Edison

Explanation:

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4 years ago

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Which statement is the best interpretation of the ray diagram shown?

Stells [14]

Answer: a convex lens forms a larger virtual image

Explanation: i just took the quiz

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3 years ago

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