A family consumes 14.5 kg of LPG in 28 days. Calculate the average energy consumed per day if calorific value of LPG is 55kJ/g

An electric bulb of 60 W is used for 6 hours per day. Calculate the units of energy consumed in one day by the bulb.

In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 KJ. Calculate the calorific value of a the fuel.

Five bulb each having 100w power are used for 4hrs, a heater having 1500w power is used 2 hrs and an electric iron of power 1000 w is used for 5 hrs for 30 days. Calculate the total energy consumed by them.

An electric bulb of power 40 W is lighted daily for 8 hours for 15 days how many units of electric energy will be consumed? also find the amount of electric bill if the rate of electricity consumption is rs.8.00 per unit

A current of 2.4 A flows through a wire of cross-sectional area 1.5 mm^2 . Find the current density in the wire. If the wire contains 8 xx 10^28m^-3 elecrtrons per unit volume calculate the average relaxation on time. Given that charge on electron = 1.6 xx 10^-19C and mass of electron =9.1 xx 10^-31 kg.

Every gram of wheat provides 0.1 g of protien and 0.25 g of carbohydrates. The corresponding values for rice are 0.05 g and 0.5 g respectively. Wheat costs Rs 4 per kg and rice Rs 6 per kg. The minimum daily requirements of protien and carbohydrates for an average child are 50 g and 200 g respectively. In what quantities should wheat and rice be mixed in the daily diet so as to provide the maximum daily requirements of protien and carbohydrates at minimum cost? Frame a LPP and solve it graphically.