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3 years ago

Reducing the lift on an aircraft when landing will increase .............. to allow for better braking ?

Physics

1 answer:

Radda [10]3 years ago

8 0

A drag because the lift keeps it up and the drag brings it down

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A person runs 15 kilometers in two hours what is his/her average speed

bazaltina [42]

Answer:

$\displaystyle V=7.5\ km/h$

Explanation:

<u>Average Speed </u>

If an object travels a distance d in a time t regardless of the direction, the average speed is the quotient of the distance over the time:

$\displaystyle V=\frac{d}{t}$

It's known a person runs d=15 kilometers in t=2 hours, thus his/her average speed is:

$\displaystyle V=\frac{15\ km}{2\ h}$

Calculating:

$\boxed{\displaystyle V=7.5\ km/h}$

5 0

3 years ago

Photons with wavelength 1 pm are incident on electrons. What is the frequency of the Compton-scattered photons at an angle of 60

natali 33 [55]

Answer:

f = 1.354*10^{20} Hz

Explanation:

By conservation of linear momentum, wavelength shift due to collision of photon to electron is given by following formula

$\lambda ^{'}-\lambda =\frac{h}{m_{o}c}(1-cos\theta )$

where h is plank constant = 6.626*10^{-34}

c = speed of light = 3*10^{8} m/s

scattered angle = 60 degree

m = rest mass of electron = 9*10^{-31}

$\lambda ^{'}=10^{-12} +\frac{6.626*10^{-34}}{9*10^{-31}*3*10^{8}}(1-cos60^{o} )$

$\lambda ^{'}= 2.215 pm$

we know that 1 pm = 10^{-12}m

$f = \frac{c}{\lambda ^{'}}$

$f = \frac{3*10^{8}}{2.215 *10^{-12}} = 1.354*10^{20} Hz$

f = 1.354*10^{20} Hz

4 0

3 years ago

I have a problem in the questions

Taya2010 [7]

WHTATATATTSSHSJSD ....... 22

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3 years ago

Write the sequence of filling electrons in the subshell in order of increasing energy.

tankabanditka [31]

Answer:

In a way of energy “1s” subsell contains most energy. because 1 s subsell contains the electrons of K orbital which is nearest from the nucleus. so the order of energy will be 1s>2s>2p> 3s> 3p> 4s> 3d> 4p> 5s> 4d> 5p> 6s> 4f> 5d> 6p> 7s and the increasing order of thair energies will be- 4s <3d<4p<5s<4d<5p<6s<4f.

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3 years ago

If your speed change from 10 km/h to 6 km/h,you have a (n)____ acceleration

miskamm [114]

<span>If your speed change from 10 km/h to 6 km/h,you have a negative acceleration</span>

4 0

3 years ago