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Yuliya22 [10]
3 years ago
9

How does a laser work?

Physics
1 answer:
a_sh-v [17]3 years ago
7 0

Answer:

A laser is created when the electrons in atoms in special glasses, crystals, or gases absorb energy from an electrical current or another laser and become “excited.” The excited electrons move from a lower-energy orbit to a higher-energy orbit around the atom's nucleus.

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An iron nail is driven into a block of ice by a single blow of a hammer. The hammerhead has a mass of 0.5 kg and an initial spee
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Answer:

The ice melts mass is:

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Kinetic Energy  

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K_E=2.56 kg*m^2/s^2

Heat gained by ice= mass(g) x 80 cal

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Assuming no loss in heat,  in the motion so both continue with temperature 0~C

To find so the mass (gm) of ice melted

m_g= 1/2 *(0.5*1000)*(3.2m/s)^2* 100*100 / (80*4.184*10^7)

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