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masya89 [10]
2 years ago
8

1. What is an antigen? Give an example​

Physics
2 answers:
jasenka [17]2 years ago
5 0

A toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
An example would be a common cold virus which causes the bodies to make antibodies which prevents the person from getting sick.
Marizza181 [45]2 years ago
4 0
A toxin or foreign substance
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A block whose weight is 45 N rests on a horizontal table. A horizontal force of 36 N is applied to the block. The coefficient of
riadik2000 [5.3K]

Answer:

1.5 m/s²

Explanation:

For the block to move, it must first overcome the static friction.

Fs = N μs

Fs = (45 N) (0.42)

Fs = 18.9 N

This is less than the 36 N applied, so the block will move.  Since the block is moving, kinetic friction takes over.  To find the block's acceleration, use Newton's second law:

∑F = ma

F − N μk = ma

36 N − (45 N) (0.65) = (45 N / 9.8 m/s²) a

6.75 N = 4.59 kg a

a = 1.47 m/s²

Rounded to two significant figures, the block's acceleration is 1.5 m/s².

Usually the coefficient of static friction is greater than the coefficient of kinetic friction.  You might want to double check the problem statement, just to be sure.

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Hitman42 [59]
SI is multiples of 10 
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34kurt

Answer:

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Explanation:

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How does emission spectra occur?
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The frequencies of light that an atom can emit are dependent on states the electrons can be in. When excited, an electron moves to a higher energy level or orbital. When the electron falls back to its ground level the light is emitted.

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mark brainliest

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What has more kinetic energy 15 kg ball rolling north at 15 m/s or a 15 kg ball rolling backwards at 7m/s
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