<span>Q = mL
</span>
We need to know the latent heat of fusion, L, for 0 degrees.
L = 336 kJ/kg, m = 2kg
where L is the latent heat for vaporization
Q = 2 * 336 = 672 kJ
For conversion between 0 and 100 degree Celsius
Q = mcθ, specific heat capacity = 4.2 kJ/kgK
Q = 2*4.2* (100 - 0) = 840 kJ
For conversion to steam at 100 degrees Celsius
<span>Q = mL , L = latent heat of vaporization = 2256 kj/kg
</span>
Q = 2 * 2256 = 4512 kJ
Total heat = 672 + 840 + 4512 = 6024 kJ
= 6 024 000 J
But 1 calorie = 4.2 J
Therefore 6 024 000 J will be: 6 024 000/4.2 ≈ 1 434 286 Calories
≈ 1 434 kCalories
Metal conducts heat quicker than wood or air so when you touch it heat is taking away from you body faster than when you touch the wood desk. When heat is taken from our bodies our brain interprets this as cold.
Explanation:
If the fourth pupil has a mass of x, and the fifth pupil has a mass of x+5, then the mean mass is:
51 = (49 + 53 + 52 + x + x+5) / 5
255 = 159 + 2x
x = 48
x + 5 = 53
The fourth pupil has a mass of 48 kg.
The fifth pupil has a mass of 53 kg.
Answer:
a = 0m/s²
Explanation:
Average acceleration = (change in velocity)/(time it takes). Since the car's change in velocity is zero, its acceleration is zero.
