Question

In which direction does the transfer of heat normally take place?
What is the cause of heat generation in the following situations:
(a) We apply brakes on our fast moving car.
(b) People often jump up and down to feel warmer in cold weather.
State two types of physical changes that may take place when a substance is
heated. boiling og mille
4. In what way(s) does a clinical thermometer differ from an ordinary thermometer?
State the mode/different modes, of heat transfer, in the following situations​

Answer 1

Answer:

Transfer of heat takes place, from higher temperature to the lower temperature.

(a)When brakes are applied on our fast moving car, the brakes produce heat due to friction. People often jump up and down in cold weather to feel warm because the body produces heat while jumping, this heat keeps them warm. When we apply brakes in a moving car heat produces due to friction.

(b)When we are jumping up and down, our heart beat and blood flow increases therefore which make us feel warmer

Therefore,

The increased blood flow causes heat generation.

Physical change that take place when a substance is heated... that means due to the heat substance changes its state from solid to liquid or liquid to gas or solid to vapour state.

4.The two main differences between a clinical and an ordinary thermometer are their functions, because an ordinary thermometer measures humidity, while a clinical thermometer measures the temperature of the human body

The mode of heat transfer is as follows:

(1) A paper cup, full of hot soup, laying on a table - convection

It is usually the mode of heat transfer in liquids and gases.

(2) Cooking vegetables in a pan- conduction

The pan, which is in direct contact with the heat source, transfers the heat to the vegetables.

(3)- Melting of a chocolate bar, in the school bag, on a hot day- conduction

Conduction of heat takes place from the surroundings to the bag and finally to the chocolate.

(4) Cooking food in a microwave oven- Radiation

It is the mode of heat transfer in which there's no direct contact between the heat source and the molecules to be heated.

Explanation:

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