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4 years ago

The shape of star dunes is mostly due to?

2 answers:

8 0

<span>The shape of star dunes is mostly due to variable wind directions. Due to the fact that the wind is blowing from many sides and hitting the dune, the sand accumulates in such a way that it forms star dunes. The amount of vegetation, variable wind speeds, and the amount of sand do not affect the formation of star dunes, but rather the direction of the winds does.</span>

tangare [24]4 years ago

4 0

Variable wind directions

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X-rays with an energy of 301 keV undergo Compton scattering with a target. If the scattered X-rays are detected at 77.5^{\circ}

Alex73 [517]

Answer:

$6.03\cdot 10^{-12} m$

Explanation:

First of all, we need to find the initial wavelength of the photon.

We know that its energy is

$E=301 keV = 4.82\cdot 10^{-14}J$

So its wavelength is given by:

$\lambda = \frac{hc}{E}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{4.82\cdot 10^{-14} J}=4.13\cdot 10^{-12}m$

The formula for the Compton scattering is:

$\lambda' = \lambda +\frac{h}{mc}(1-cos \theta)$

where

$\lambda$ is the original wavelength

h is the Planck constant

m is the electron mass

c is the speed of light

$\theta=77.5^{\circ}$ is the angle of the scattered photon

Substituting, we find

$\lambda' = 4.13\cdot 10^{-12} m +\frac{6.63\cdot 10^{-34} Js)}{(9.11\cdot 10^{-31}kg)(3\cdot 10^8 m/s)}(1-cos 77.5^{\circ})=6.03\cdot 10^{-12} m$

7 0

3 years ago

What does weighing less on the moon mean for astronauts on the moon?

AnnyKZ [126]

Answer:

Isaac Newton discovered that as an object's mass increases, the gravitational attraction of that object increases. Thus, the gravitational attraction on the Moon is much less than it is here on Earth, and a person weighs less on the Moon.

hope this helps!

5 0

3 years ago

Mike and Juan were studying forces and decided to do an experiment. they placed four

lora16 [44]

Answer:

Friction.

Explanation:

The is friction because the blocks are different substances, and different substances are able to move across different flooring more easily.

3 0

3 years ago

What kind of animals might benefit from a locust swarm

Serggg [28]

Birds that eat insects, this is because their is more of their primary food source for them. If they're constantly there from the locust they wont have to look for food and will be able to reproduce and populate their territory. An example would be how when the Euorpean rabbit came to Australia, it took out the native competiton and was able to eat the vast amount of plants that was perfect for their diet back in Europe, but not so much for the other animals.

3 0

3 years ago

Calculate the acceleration of a 3000 kg truck that had a net force of 500 N applied to it. Express your answer in m/s^2???

WINSTONCH [101]

Newton's 2nd law of motion . . . . . Force = (mass) x (acceleration)

Divide each side by (mass), and you have

Acceleration = (force) / (mass)

We know the force and mass for this truck, so we can fillum in:

Acceleration = (500 N) / (3,000 kg) = 0.167 m/s² .

6 0

3 years ago