Select the correct answer.Light incident on a surface at an angle of 45° undergoes diffused reflection. At what angle will it reflect?
A.
only at angles less than 45°
B.
only at angles greater than 45°
C. only at 45°
at any angle between -90° and 90°
D.
E.
only at 0°
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Answers

Answer 1

Answer:

Answer:

b i think

Explanation:

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1 . A farmer moves along the boundary of his rectangular field of side 10m x 20m . farmer covers 1m in 1sec . what will be the magnitude of displacement at the total distance travelled.2 . Rahul pedals his cycle from rest. Pedals his cycle to get a velocity of 10 ms-1 in 30 seconds. then he applies brakes in such that the velocity of the cycle comes does to 6 ms-1 in next 5 seconds . calculate the acceleration and deceleration .

Why is atomaspheric pressure greater at the surface on Earth

Answers

Hello!

Because as you get closer to the surface of the earth, the more air that is on top of you. At the top of the atmosphere, there is less air, and everything is a vacuum, where you have no weight. When you get close to the earth, the weight of the air builds until it when you're at the very lowest point of the earths surface, all the air in the atmosphere above you is pressing down.

Thank You!

Because there are miles of air on top of you and air has mass so all the mass of the air on top of you is on your head and the ground. (the air can't penetrate the ground)

Take note: Air is also denser at sea level because it was compressed.

The position of a particle moving along the x axis may be determined from the expression x(t) = btu + ctv, where x will be in meters when t is in seconds. What will be the dimensions of b and c in this case if u = 8 and v = 7?

Answers

The dimension of b and c is $b = M^0L^1T^{-8$ and $c = M^0L^1T^{-7$

Calculation of dimension:

Since the x axis may be determined from the expression that shown below.

$x = bt^u + ct^v$

Here, x will be in meters when t is in seconds

Now

Here the dimension of the right side should be equivalent to the left side.

According to the left side the dimension should be same like length or meter so same goes for the right side

So,

$bt^u = M^0L^1T^0\n\nb* T^8 = M^0L^1T^0\n\nb = M^0L^1T^(-8)$

Now for another one it is

$ct^v = M^0L^1T^0\n\nc* T^7 = M^0L^1T^0\n\nc = M^0L^1T^{-7$

Learn more about position here: brainly.com/question/13335785?referrer=searchResults

As per given equation we have

$x = bt^u + ct^v$

now as per the dimensional analysis we can say that dimension of right side of equation must be equal to left side of the equation

now as per left side of equation its dimension is same as length or meter

now we can say it should be meter on right side also

$bt^u = M^0L^1T^0$

$b*T^8 = M^0L^1T^0$

$b = M^0L^1T^(-8)$

similarly for other term we have

$ct^v = M^0L^1T^0$

$c*T^7 = M^0L^1T^0$

$c = M^0L^1T^(-7)$

so above are the dimensions of b and c

Ii. At what height would the steel beam have a gravitational potential energy of 100,000 J? (1

Answers

The height of the steel beam is 30.9 m

Explanation:

The gravitational potential energy of an object is the energy possessed by an object due to its position in the gravitational field. Near the Earth's surface, the gravitational potential energy of an object is given by

$U=mgh$

where

m is the mass of the object

g is the acceleration of gravity

h is the height of the object above the ground

For the steel beam in this problem, we have:

U = 100,000 J is the potential energy

m = 330 kg is the mass

$g=9.8 m/s^2$

Solving for h, we find the height of the steel beam:

$h=(U)/(mg)=(100,000)/((330)(9.8))=30.9 m$

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A force is always required to move an object from rest

Answers

True a resultant force is needed

Which best describes the difference between radiation and conduction? Conduction cannot happen when both objects are solids. Conduction requires two objects to be in physical contact.
Conduction can occur between two objects that are very far apart.
Conduction decreases the movement of the atoms in both objects.

Answers

Conduction is went two objects are directly touching each other. They must come into contact with each other. Like sitting on a cold bench that eventually becomes warm due to your body heat. Think of radiation as the suns rays when you get sunburnt.
Your Answer would be B. Conduction requires two objects to be in physical contact.
Hope this helps!

Ionic compounds molecules have strong forces of attraction between neighboring molecules. Which conclusion could be drawn about materials held together by ionic bonds? A) These materials would have low densities as solids. Eliminate B) These materials would have very high boiling points. C) These materials will likely be gases at room temperature. D) These materials will likely be liquids at room temperature.