Which is true?

a changing magnetic field produces a constant perpendicular magnetic field.
a changing magnetic field produces a changing perpendicular magnetic field.
a changing magnetic field produces a constant parallel magnetic field.
a changing magnetic field produces a changing parallel magnetic field.
a changing magnetic field produces an electric field.

the answer is b ) square root of 5

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.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s