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Give reason for Sea water does not freeze at 0°C.
A 50 kg man is running at a speed of 18 km h−1. If all the kinetic energy of the man can be used to increase the temperature of water from 20°C to 30°C, how much water can be heated with this energy?
Consider the situation of the previous problem. Assume that the temperature of the water at the bottom of the lake remains constant at 4°C as the ice forms on the surface (the heat required to maintain the temperature of the bottom layer may come from the bed of the lake). The depth of the lake is 1.0 m. Show that the thickness of the ice formed attains a steady state maximum value. Find this value. The thermal conductivity of water = 0.50 W m−1°C−1. Take other relevant data from the previous problem.
Draw a graph between volume and temperature, when 5 cm3 of ice at -10°C is heated to form water at +10°C.
In cold countries, the water pipes are covered with poor conductors. Why?
What will be the approximate temperature of water in the lake shown in the following diagram?
(i) At X, and
(ii) At Y?
In a region with a cold climate the aquatic animals can survive at 4 °C, because _______.
Write the name.
The instrument used to study anomalous behaviour of water.
Write scientific reason.
Fish can survive even in frozen ponds in cold regions.
Write a short note.
Anomalous behaviour of water
