2. random motion in vertical direction
Answer:
The material that Emily invented can be easily repaired by shining ultraviolet light on it.
Explanation:
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Answer:
Explanation:
Conduction of heat through a thick layer is governed by the following relation
Q = KA( T₂ -T₁ ) / d
K is thermal conductivity of medium ( it is earth here ) , A is surface area though which heat conducts and T₂ -T₁ is temperature difference and d is thickness of medium through which heat conducts.
k = 8 units
A = surface area= 2πrL
= 2x 3.14 x 2/12 x 100
= 104.67 ft²
T₂ -T₁ = 70 - 42
= 28 F
d = thickness
= 30 /12 ft
= 2.5 ft
Putting the given values here
Q =
= 9378.4 Btu per hour.
<u>Answer</u>
Immune system
The body’s defense against germs and diseases is called the immune system. The immune system consists of network cells which work together to protect the body
Gravity always produces a pair of forces ... two of them.
The forces are opposite.
One force pulls 'A' toward 'B'.
The other force pulls 'B' toward 'A'.
For this question, let's say Astronaut Bob is standing on Mars.
There are two forces of gravity between the Astronaut and the planet.
One force pulls Bob toward Mars.
The other force pulls Mars toward Bob.
The force that pulls Bob toward Mars is what we call his "weight".
The other force ... the one that pulls Mars toward Bob ... is
the force that nobody ever talks about, but it's there.
The force that attracts you toward the Earth is
your "weight" on Earth.
The force that attracts the Earth toward you is
the Earth's weight on you.
The two forces are equal !