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A person uses 770 kcal on a long hike. Calculate the energy used for the hike in each of the following energy units.
What is the energy in joules?
Express the energy in joules to two significant figures.
What is the energy in kilojoules?
Express the energy in kilojoules to two significant figures.

Respuesta :

Explanation:

1 Cal of energy is equivalent to 4.184 Joules.

A.

770Cal of energy = 3221.680 joules

Therefore, 780kCal of energy = 3221680 Joules.

B.

3200000 Joules (in 2 s.f).

C.

I000 joules = 1 kJoule

3221680 joules = 3221.689 kJoules.

D.

3200 kJ (in 2 s.f).