Answer: 16N
Explanation:
According to Coulomb's law, the force existing between two charges is directly proportional to the product of their charges and inversely proportional to the distance between the charges. Mathematically,
F = kq1q2/r²
Where F is the force between them
q1 and q2 are the charges
r is the distance between them.
If the force between them is 10N, the formula becomes;
10 = kq1q2/r²... (1)
If the distance between them is now halved, the force will become
F = kq1q2/(r/2)²
F = kq1q2/(r²/4)
F = 4kq1q2/r² ... (2)
Dividing equation 1 by 2 we have;
4/F = (kq1q2/r²)÷ (4kq1q2/r²)
4/F = kq1q2/r²×r²/4k1q1q2
4/F = 1/4
Cross multiplying we have;
F = 4×4
F = 16N
Therefore the new force between the charges is 16N
Answer:
The energy transferred is 2.93 MJ.
Explanation:
Given that,
Time = 1 h = 3600 s
Area
Width 
Temperature 

For concrete wall,
The thermal conductivity
k = 1.7 W/mK
Using Fourier's law

Where, A = area
= width
= change in temperature
k = thermal conductivity
Put the value into the formula


The energy transferred in 1 hour





Hence, The energy transferred is 2.93 MJ.
Answer:
Explanation:
Given
mass of sailboat 16300 kg
Eastward Force
=17300 N
Northwest Force
=59000


Resultant Force F is given by vector addition of two



|F| gives resultant magnitude

|F|=48340.48 N
therefore acceleration is given by

Answer:
Explanation:
Digestion is the breaking down of food in order to release energy for the body. The body obtains its required nutrients through the process of digestion. In digestion, food is broken down and energy is released.
Mechanical digestion involves the breakage of food into tiny bits. Chemical digestion uses chemicals secreted in the body to completely and finally breakdown food.
Mechanical digestion helps the course of chemical digestion. In mechanical digestion, food is broken down by chewing, cudding, churning e.t.c. Here large chunks of food are broken down into tiny bits. The tiny fragments of food has more surface area than the bulk mass. Increase in surface area makes chemical reactions on food very fast. As the food is being subjected to mechanical breakage, chemical action takes place simultaneously.
The food being broken would then be mixed with chemical substances in the body for proper breakage. Chemical digestion completes the digestive process. Chemically digested food can easily be taken into the blood stream where they are transported to different sites within the body.