Answer:
The pencil is not pulled towards a person due to a very small magnitude of force between them, due to lighter masses.
Explanation:
Let us apply Newton's Law of Gravitation between a person and pencil.
Average Mass of a Normal Pencil = m₁ = 10 g = 0.01 kg
Average Mass of a Person = m₂ = 80 kg
Distance between both = r = 1 cm = 0.01 m (Taking minimal distance)
Gravitational Constant = G = 6.67 x 10⁻¹¹ N.m²/kg²
So,
F = Gm₁m₂/r²
F = (6.67 x 10⁻¹¹ N.m²/kg²)(0.01 kg)(80 kg)/(0.01 m)²
<u>F = 5.34 x 10⁻⁷ N</u>
This Force is very small in magnitude due to the light masses of both objects.
<u>Therefore, the pencil is not pulled towards a person due to a very small magnitude of force between them, due to lighter masses.</u>
Answer:
(a) Q = 142.67 W
(b) Basal Metabolic Rate = 178.33 W
Explanation:
(a)
We can find the heat radiated by the person by using Stefan-Boltzman's law:
where,
Q = heat radiated per second = ?
σ = Stefan-Boltzman Constant = 5.6703 x 10⁻⁸ W/m².k⁴
A = Surface Area = 2 m²
T = Temperature of Skin = 30° C + 273 = 303 k
Ts = Temperature of room = 18° C +273 = 291 k
Therefore,
![Q = (5.6703\ x\ 10^{-8}\ W/m^2.k^4)(2\ m^2)[(303\ k)^4-(291\ k)^4]](https://tex.z-dn.net/?f=Q%20%3D%20%285.6703%5C%20x%5C%2010%5E%7B-8%7D%5C%20W%2Fm%5E2.k%5E4%29%282%5C%20m%5E2%29%5B%28303%5C%20k%29%5E4-%28291%5C%20k%29%5E4%5D)
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<u>Q = 142.67 W</u>
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(b)
Since the heat calculated in part (a) is 80 percent of basal metabolic rate. Therefore,
<u>Basal Metabolic Rate = 178.33 W</u>
Answer:
Explanation:
Doppler radar works by sending <u>a beam of electromagnetic radiation waves, </u>tuned to a precise frequency, at a moving object. You can use Doppler radar on a stationary object, of course, but it's fairly uninteresting unless the target is moving
Answer:
Explanation:
pointers for comedy.
1. dont just add jokes in at random places. you have to make the whole thing funny. not just random spurts of funny
2. use sentences like, "evaporation can be really fun. first you are holding hands with other molecules forming a puddle then you shoot up into space. When you reach the top you get stuck to sand and you fall back to the earth."
3. if you simplify the processes so a child could understand them then it will be easier to make them funny.
4. once you get started it will be easier to keep it funny.
Hope this helps and you can understand it (it makes sense to me but it might not make sense to you)
