Write Stefan.s law, define emissivity of a material. Derive Newton.s law of cooling and plot of a graph between temperature and time.

(a) Write Stefan.s law and define emissivity of a material. Derive Newton.s law of cooling and plot a graph between temperature and time.

State Newton's law of cooling and draw the graph showing cooling of hot water with temperature.

State Newton.s second law of motion.

Two bodies A and B of equal masses, area and emissivity cooling under Newton's law of cooling from same temperature are represented by the graph: If theta is the instantaneous temperature of the body and theta_(0) , is the temperature of surroundings, then relationship between their specific heats is

State Newton.s law of gravitation. Distinguish between g and G.

What is the difference between Stefan's law and Newton's law of cooling ?

A liquid in a beaker has temperature theta(t) at time t and theta_0 is temperature of surroundings, then according to Newton's law of cooling the correct graph between log_e( theta-theta_0) and t is :

Two solid spheres A and B made of the same material have radii r_(A) and r_(B) respectively . Both the spheres are cooled from the same temperature under the conditions valid for Newton's law of cooling . The ratio of the rate of change of temperature of A and B is

A hot body placed in air is cooled down according to Newton's law of cooling, the rate of decrease of temperature being k times the temperature difference from the surrounding. Starting from t=0 , find the time in which the body will lose half the maximum heat it can lose.

A hot body placed in air is cooled down according to Newton's law of cooling, the rate of decrease of temperature being k times the temperature difference from the surrounding. Starting from t=0 , find the time in which the body will loss half the maximum heat it can lose.