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viva [34]
3 years ago
5

Rainbow can appear at night,they are called Moonbow?

Physics
1 answer:
Leona [35]3 years ago
7 0
Yes, they are also known as white rainbows or lunar rainbows.
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Sunspots appear dark because they are cooler than the surrounding solar surface. True or false
DiKsa [7]

Answer:

False, Sunspots appear dark (in visible light) due to their low temperature(cooler) than rest of the sun

Explanation:

Sunspots appear dark because they are much cooler( have low temperature than the rest of the surface contained by Sun. As they appear dark, but still they have very temperature that's why so hot. Sunspots have temperatures ranges  3,500 Celsius (3773 kelvin) and the surrounding surface of the sun has a temperature much higher of about 5,500 Celsius(5773 Kelvin). Even if we see a sunspot alone in space,  it will glow so brightly.

Learn more about sunspots :

brainly.com/question/27774496

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6 0
1 year ago
What are visible colors of light has the longest wavelength?
sasho [114]

Answer:

Red has the longest wavelength among all the visible colors of light.

Explanation:

Visible light is the only electromagnetic radiations which can be seen by human eye.  When white visible light passes through a prism it breaks down into 7 distinctive colors of rainbow.

These are red, orange, yellow, green blue, indigo and violet.

Red has the longest wavelength of around 700 nano meters with violet has the shortest wavelength of 380 nano meters.

8 0
3 years ago
A motorcyclist travelling at 30m/s starts to apply his brake when he is 50m from the traffic light that has just turned red .if
fredd [130]
80 because if you add 50 +30 =80 so yea that why I pick 80
3 0
3 years ago
A block is attached to a spring, with spring constant k, which is attached to a wall. it is initially moved to the left a distan
Ghella [55]

Answer:

x(t) = d*cos ( wt )

w = √(k/m)

Explanation:

Given:-

- The mass of block = m

- The spring constant = k

- The initial displacement = xi = d

Find:-

- The expression for displacement (x) as function of time (t).

Solution:-

- Consider the block as system which is initially displaced with amount (x = d) to left and then released from rest over a frictionless surface and undergoes SHM. There is only one force acting on the block i.e restoring force of the spring F = -kx in opposite direction to the motion.

- We apply the Newton's equation of motion in horizontal direction.

                             F = ma

                             -kx = ma

                             -kx = mx''

                              mx'' + kx = 0

- Solve the Auxiliary equation for the ODE above:

                              ms^2 + k = 0

                              s^2 + (k/m) = 0

                              s = +/- √(k/m) i = +/- w i

- The complementary solution for complex roots is:

                              x(t) = [ A*cos ( wt ) + B*sin ( wt ) ]

- The given initial conditions are:

                              x(0) = d

                              d = [ A*cos ( 0 ) + B*sin ( 0 ) ]

                              d = A

                              x'(0) = 0

                              x'(t) = -Aw*sin (wt) + Bw*cos(wt)

                              0 = -Aw*sin (0) + Bw*cos(0)

                              B = 0

- The required displacement-time relationship for SHM:

                               x(t) = d*cos ( wt )

                               w = √(k/m)

3 0
3 years ago
There are two types of addiction, psychological and physical. A. True B. False
Alexus [3.1K]
It is true that there are two types of addiction, psychological and physical. When it comes to physical addiction, it normally refers to drug withdrawal or drug usage, when your body is exhibiting various symptoms of needing drugs. Mental addiction refers to when there is no actual need to use the object of addiction, but rather a mental desire to use it and have it again.
4 0
3 years ago
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