Acharge of +13 *10^-9 c is placed 0.25 m away from a charge of -23*10^-9 c. what will be the resultant electrical force? a. 4.3 *10^-5 c, attractive b. 4.3 *10^-5 c, repulsive c. 5.1 *10^-20 c, attractive d. 5.1 *10^-20 c, repulsive

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.

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