A student is given a red and a blue liquid. The two samples of liquids are heated in identical beakers over identical Bunsen bur
2 answers:
Explanation :
It is given that a student is given a red and a blue liquid. The two samples of liquids are heated in identical beakers over identical Bunsen burners.
It is observed that the red liquid shows a dramatically faster increase in temperature.
This observation can be explained in terms of specific heat. It is defined as the heat required to raise the temperature.
We know that the specific heat of any liquid is given by :
Where c is the specific heat.
m is the mass of the substance.
Q is the amount of heat.
is the change in temperature.
So, it is clear that the specific heat capacity is inversely proportional to the temperature.
The better explanation for this can be the specific heat of the red liquid is less because it drastically increases in temperature.
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Answer:
A: The acceleration is 7.7 m/s up the inclined plane.
B: It will take the block 0.36 seconds to move 0.5 meters up along the inclined plane
Explanation:
Let us work with variables and set
As shown in the attached free body diagram, we choose our coordinates such that the x-axis is parallel to the inclined plane and the y-axis is perpendicular. We do this because it greatly simplifies our calculations.
Part A:
From the free body diagram we see that the total force along the x-axis is:
Now the force of friction is where
is the normal force and from the diagram it is
Thus
Therefore,
Substituting the value for we get:
Now acceleration is simply
The negative sign indicates that the acceleration is directed up the incline.
Part B:
Which can be rearranged to solve for t:
Substitute the value of and
and we get:
which is our answer.
Notice that in using the formula to calculate time we used the positive value of , because for this formula absolute value is needed.
