Answer:
Explanation:
= Heat capacity of Hg = 28 J/mol
= Change in temperature = 
= Enthalpy of fusion = 2.29 kJ/mol
The number of moles is given by
Heat is given by
Heat released is given by
Total heat is given by
The total heat released is
Answer:
The highest percentage of change corresponds to the thinnest rod, the correct answer is a
Explanation:
For this exercise we are asked to change the length of the bar by the action of a force applied along its length, in this case we focus on the expression of longitudinal elasticity
F / A = Y ΔL/L
where F / A is the force per unit length, ΔL / L is the fraction of the change in length, and Y is Young's modulus.
In this case the bars are made of the same material by which Young's modulus is the same for all
ΔL / L = (F / A) / Y
the area of the bar is the area of a circle
A = π r² = π d² / 4
A = π / 4 d²
we substitute
ΔL / L = (F / Y) 4 /πd²
changing length
ΔL = (F / Y 4 /π) L / d²
The amount between paracentesis are all constant in this exercise, let's look for the longitudinal change
a) values given d and 3L
ΔL = cte 3L / d²
ΔL = cte L /d² 3
To find the percentage, we must divide the change in magnitude by its value and multiply by 100.
ΔL/L % = [(F /Y 4/π 1/d²) 3L ] / 3L 100
ΔL/L % = cte 100%
b) 3d and L value, we repeat the same process as in part a
ΔL = cte L / 9d²
ΔL = cte L / d² 1/9
ΔL / L% = cte 100/9
ΔL / L% = cte 11%
c) 2d and 2L value
ΔL = (cte L / d ½
)/ 2L
ΔL/L% = cte 100/4
ΔL/L% = cte 25%
d) value 4d and L
ΔL = cte L / d² 1/16
ΔL/L % = cte 100/16
ΔL/L % = cte 6.25%
The highest percentage of change corresponds to the thinnest rod, the correct answer is a
The density of the substance is obtained by dividing its mass by its volume. Density is an intensive property which means that its value does not depend on the amount of substance and will always stay the same for same conditions.
d = 84.7 g / 46.7 cm³ = 7.75 g / x cm³
The value of x is approximately 4.27 cm³.
The distance covered is 8 blocks, the displacement is 2 blocks up
Explanation:
- Distance is a scalar quantity measuring the total length of the path covered by an object, regardless of the direction of its motion
- Displacement, on the other hand, is a vector quantity equal to the difference between the final position of motion and the initial position of motion. Its magnitude is equal to the shortest distance in a straight line between the initial and final point of motion.
In this problem, Kim walks the dog 5 blocks up and 3 blocks down:
- The distance is just the total length of the path taken, therefore:
- The displacement is a vector connecting the final point to the initial point. Since Kim walks 5 blocks up and 3 blocks down, her final position is
x = +5 +(-3) = +2
Which means, 2 blocks up. Therefore, the displacement is 2 blocks up.
Learn more about distance and displacement:
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