Aforce of 450 n accelerates a box across a frictionless surface at a rate of 15 m/s2. find the mass of the box?

a) 30 n

b) 30 kg

c) 6,750 n

d) 6,750 kg

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.

wavelength divides in half and speed stays the same.