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3 years ago

Please help me with this. Finding speed.

Physics

2 answers:

JulijaS [17]3 years ago

7 0

The speed is 80 m/h you find it by dividing the distance by time

Neporo4naja [7]3 years ago

4 0

What you need is a definition of average speed. Here it is:

   Average speed = (distance covered) / (time to cover the distance) .

For the race car in the question:

Average speed = (200 mile) / (2.5 hour)

   = (200 / 2.5) (mile/hour)

   =    80 miles per hour .

That doesn't seem all that fast for a race-car.
But the math is bullet-proof.

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A 0.500-nm x-ray photon is deected through 134 in a Compton scattering event. At what angle (with respect to the incident beam)

natita [175]

Answer:

The angle of recoil electron with respect to incident beam of photon is 22.90°.

Explanation:

Compton Scattering is the process of scattering of X-rays by a charge particle like electron.

The angle of the recoiling electron with respect to the incident beam is determine by the relation :

$\cot\phi = (1+\frac{hf}{m_{e}c^{2} })\tan\frac{\theta }{2}$ ....(1)

Here ∅ is angle of recoil electron, θ is the scattered angle, h is Planck's constant, $m_{e}$ is mass of electron, c is speed of light and f is the frequency of the x-ray photon.

We know that, f = c/λ ......(2)

Here λ is wavelength of x-ray photon.

Rearrange equation (1) with the help of equation (1) in terms of λ .

$\cot\phi = (1+\frac{h}{m_{e}c\lambda })\tan\frac{\theta }{2}$

Substitute 6.6 x 10⁻³⁴ m² kg s⁻¹ for h, 9.1 x 10⁻³¹ kg for $m_{e}$ , 3 x 10⁸ m/s for c, 0.500 x 10⁻⁹ m for λ and 134° for θ in the above equation.

$\cot\phi = (1+\frac{6.6\times10^{-34} }{9.1\times10^{-31}\times3\times10^{8}\times0.5\times10^{-9} })\tan\frac{134 }{2}$

$\cot\phi=2.37$

$\phi$ = 22.90°

8 0

3 years ago

Which means "to study or examine”?

garik1379 [7]

analyze. Analyze means to study or examine something carefully in a methodical way. ... This verb analyze comes from the noun analysis. The noun analysis was in turn borrowed from Greek, from analyein, or "to dissolve."

hope it helps;)

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3 years ago

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Firlakuza [10]

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3 years ago

Describe the water cycle process starting from an afternoon thunderstorm. There are many different variations that could happen.

spin [16.1K]

Explanation:

The water cycle basically involves five steps:

evaporation and transpiration ⇄
condensation, ⇄
precipitation, ⇄
runoff, ⇄
infiltration ⇄

So when a thunderstorm occurs it helps in completing the precipitation process by enabling the release of water vapor stored up in the atmosphere to fall on the ground as rain.

After this, the water runoffs to the surface of the ground, on plants, into rocks, rivers, and lakes.

Next, the Infiltration process enables the water on the ground surface to enter the soil some of which becomes groundwater.

The cycle begins again as the evaporation and transpiration process begins, where the groundwater as a result of heat from the sun is taken back into the atmosphere, while water in plants by means of transpiration goes back into the atmosphere.

It then condenses and falls back as precipitation again.

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3 years ago

The scale model of an airplane is 1:130, where 1 inch on the model is equal to 130 inches on the actual airplane. Which statemen

Delicious77 [7]

Answer:

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2 years ago