1 cal = `……….` J (लगभग )|

1 kcal = 4180 cal

A lead bullet of mass 50g moving with a velocity of 100ms^(-1) strikes a target. If 40% of the heat produced is retained by the bullet, calculate the rise in its temperature. Specific heat of lead = 0.03 cal g^(-1)K^(-1) and J = 4.2 J cal^(-1)

A refrigerator works between 4^(@)C and 30^(@)C . It is required to remove 600 cal of heat every second in order to keep the temperature of the refrigerator space constant. The power required is (take 1 cal = 4.2 J)

The molar specific heats of an ideal gas at constant volume and constant pressure are respectively 4.98 and 6.96 cal mol^(-1) K^(-1) . If the molecular weight of the gas be 32, then calculate the root means square speed of the molecule of the gas at 120^@ C . (1 cal = 4.2 J)

The molar specific heats of an ideal gas at constant volume and constant pressure are respectively 4.98 and 6.96 cal mol^(-1) K^(-1) . If the molecular weight of the gas be 32, then calculate the root means square speed of the molecule of the gas at 120^@ C . (1 cal = 4.2 J)

The calorie is defined as 1 cal= 4.86 joule Why as 1 cal= 4J to make the conversions easy?