Answer:
Explanation:
The force of kinetic friction on the block is defined as:
Where 
is the coefficient of kinetic friction between the block and the surface and N is the normal force, which is always perpendicular to the surface that the object contacts. So, according to the free body diagram of the block, we have:
Replacing this in the first equation and solving for :
Answer:
Weight of air per unit area is pressure due to atmosphere. So here correct answer is Weight
Explanation:
As we know that air pressure is given by
now we know that force here due to air is due to the weight of the air
so here in order to calculate the weight we will have
here we know that
Ah = volume of air above the point where pressure is to be calculated
now from above formula we have
so here we can say that pressure is due to weight of air
Answer:
Explanation:
Amount of heat required can be found from the following relation
Q = mcΔT
m is mass of the body , c is specific heat and ΔTis rise in temperature .
Here m = 300 kg
c = 3350 J /kg k
ΔT = 30 - 25
= 5 °C
Putting the values in the expression above
Q = 300 x 3350 x 5
= 5025000 J
Rate at which energy is absorbed = 1200 J /s
Time required
= 5025000 / 1200
= 4187.5 S
= 69.8 minute
= 1 hour 9.8 mimutes.
Answer:
As far as I remember, the following which would depend upon the amount of matter in an object is only its mass because weight is a point which is always variable according to the main rules of the gravitational pull. I bet this answer will be helpful for you! Regards
Hope this helps!
Answer:
One example of a medium is air.
Explanation:
