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viva [34]
4 years ago
5

Rainbow can appear at night,they are called Moonbow?

Physics
1 answer:
Leona [35]4 years ago
7 0
Yes, they are also known as white rainbows or lunar rainbows.
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A 45.0 - kg girl is standing on a 150. - kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a
Mrac [35]

Answer:

The velocity relative to the surface of the ice is 6.5 m/s.

Explanation:

Given that,

Mass of girl m= 45.0 kg

Mass of plank M= 150 kg

Velocity = 1.50 m/s

We need to calculate the velocity relative to the surface of the ice

Using conservation of momentum

mv_{1}+Mv_{2}=(m+M)v

Here, v_{2}=0 because plank at rest

v_{1}=\dfrac{m+M}{m}\times v

Put the value into the formula

v_{1}=\dfrac{45+150}{45}\times1.50

v_{1}=6.5\ m/s

Hence, The velocity relative to the surface of the ice is 6.5 m/s.

6 0
3 years ago
....,..................,..,.......<br><br>​
I am Lyosha [343]
I agree, or is this morse code…?
3 0
3 years ago
Kisha is trying to determine if a cell is a plant or animal cell. She observes the cell under the microscope and describes some
Ann [662]
There are organelles in the plant cell that the animal cell does not have. Plant cells have rigid cell walls and animal cells have flexible cell membrane. Plant cells contains chloroplasts, which is something animal cells don't have. Also, large, liquid filled vacuoles can only be found in plant cells, and they can occupy up to 90% of a cell's volume. By looking at the cell and see if they have any of these characteristics determines if it is plant cell or animal cell.

hope this helps.
6 0
4 years ago
The wheelchair starts from rest. It accelerates at a constant rate until it has a speed of 1.5 m/s. The wheelchair travels a dis
anastassius [24]
<h2><em><u>Answ</u></em><em><u>er</u></em><em><u>:</u></em><em><u>-</u></em></h2>

\pink{\bigstar} The acceleration of the wheelchair is \large\leadsto\boxed{\tt\purple{0.5625 \: m/s^2}}

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

<h3>• <u>Given</u><u>:</u><u>-</u></h3>

  • Initial velocity of the wheelchair = 0 m/s

  • Final velocity of the wheelchair = 1.5 m/s

  • Distance covered by the wheelchair = 2 m

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

<h3>• <u>To</u><u> </u><u>Find</u><u>:</u><u>-</u></h3>

  • Acceleration of the wheelchair = ?

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

<h3>• <u>Solution</u><u>:</u><u>-</u></h3>

We know,

• <u>Third</u><u> </u><u>Eq</u><u>uation</u><u> of</u><u> Motion</u><u>:</u><u>-</u>

\pink{\bigstar} \large\underline{\boxed{\bf\green{v^2 - u^2 = 2as}}}

where,

  • u = Initial velocity

  • v = Final velocity

  • a = Acceleration

  • s = Distance covered

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

• <u>S</u><u>u</u><u>b</u><u>s</u><u>t</u><u>i</u><u>t</u><u>u</u><u>t</u><u>i</u><u>n</u><u>g</u><u> </u><u>the</u><u> </u><u>values</u><u> </u><u>in</u><u> </u><u>th</u><u>e</u><u> </u><u>Formula</u><u>:</u><u>-</u>

➪ \sf (1.5)^2 - (0)^2 = 2 \times a \times 2

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

➪ \sf 2.25 - 0 = 4 \times a

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

➪ \sf 2.25 = 4 \times a

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

➪ \sf a = \dfrac{2.25}{4}

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

★ \large{\bold\red{a = 0.5625 \: m/s^2}}

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

Therefore, the acceleration of the wheelchair is 0.5625 m/s².

7 0
3 years ago
A little girl kicks a soccer ball. It goes 10 feet and comes back to her. How is this possible?
Kitty [74]

Ever heard of gravity? She kicked it up.

3 0
3 years ago
Read 2 more answers
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