A4.5cm tall object is placed 28cm in front of a spherical mirror. it is to produce a virtual image that is upright and 3.5cm tall.
a) what type of mirror is used ?
b) where is the image located ?
c) what is the focal length ?
d) what is the radius of curvature ?

when it gains or loses electrons

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.