Question

в сосуде лежит кусок льда температура льда 0 если сообщить количество теплоты Q то лед растает и получится вода температурой 20какая доля льд растает, если сообщить ему кол-во теплоты q=Q/2

Answer 1

L=335 кДж/кг  -удельная теплота плавления  льда

с=4,183 кДж/кг*К - удельная теплоемкость воды

Q=Qпл+Qнагр=Lm+cmΔt=335m+4.183*20*m=335m+83.66m=418.66m

q=418.66m/2=209.33m

для того, что бы растаял весь лед необходимо Q=335m, если мы сообщим 209,33m тепла, то растаит 209,33m*100/335m=62.49 % льда.

Answer 2

Understanding the Problem

You have a vessel containing a piece of ice with a temperature of 0 degrees Celsius. If a certain amount of heat, denoted as Q, is supplied to the ice, it will melt and turn into water with a temperature of 20 degrees Celsius. You want to know what fraction of the ice will melt if the amount of heat supplied is q = Q/2.

Solution

To find the fraction of the ice that will melt when q = Q/2, we need to calculate the amount of heat required to completely melt the ice and then determine the fraction of that heat that is supplied when q = Q/2.

1. Calculate the amount of heat required to completely melt the ice: - The specific heat capacity of ice is approximately 2.09 J/g°C. - The heat required to melt 1 gram of ice at 0°C is called the heat of fusion and is approximately 334 J/g. - Therefore, the total heat required to completely melt the ice can be calculated as follows: - Heat required = mass of ice * heat of fusion

2. Determine the fraction of the heat supplied when q = Q/2: - The fraction of the heat supplied can be calculated as follows: - Fraction of heat supplied = q / (heat required)

Let's calculate the fraction of the ice that will melt when q = Q/2.

Calculation

1. Calculate the heat required to completely melt the ice: - Let's assume the mass of the ice is 1 gram. - Heat required = 1 gram * 334 J/g = 334 J

2. Determine the fraction of the heat supplied when q = Q/2: - Fraction of heat supplied = (Q/2) / (334 J)

Since we don't have the value of Q, we cannot calculate the exact fraction of the ice that will melt when q = Q/2. However, we can provide you with the formula and steps to calculate it once you have the value of Q.

Please provide the value of Q, and we will be happy to help you calculate the fraction of the ice that will melt when q = Q/2.