(a) a fundamental law of motion states that the acceleration of an object is directly proportional to the resultant force exerte
1 answer:
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Answer:
a= - 0.79 m/s²
Explanation:
Given that
Speed ,u = 20 mi/h
We know that
1 mi/h= 0.44 m/s
Therefore ,u = 8.94 m/s
Distance ,s= 50 m
Lets take the acceleration of the car = a m/s²
The final speed of the car ,v = 0 m/s
We know that
v²= u² + 2 a s
Now by putting the values
0²= 8.94² + 2 x a x 50
a= - 0.79 m/s²
Therefore the acceleration will be - 0.79 m/s².
1) The wavelength of the radiation emitted by the human skin is
the frequency of the radiation is related to the wavelength by
where
is the speed of light. Plugging numbers into the formula, we find the frequency of the radiation:
2) The frequency of this radiation is 313 GHz, and its wavelength
. If we look at the table of the electromagnetic spectrum
https://en.wikipedia.org/wiki/Electromagnetic_spectrum
We see that we are in the range of visible light (in particular, in the infrared range).
Therefore, the correct answer is <span>2. visible light .</span>
the frequency of the radiation is related to the wavelength by
where
2) The frequency of this radiation is 313 GHz, and its wavelength
https://en.wikipedia.org/wiki/Electromagnetic_spectrum
We see that we are in the range of visible light (in particular, in the infrared range).
Therefore, the correct answer is <span>2. visible light .</span>