Please can someone help by answering these questions asap. A cow has eaten 1500KJ of stored chemical energy in the form of food. 945KJ is excreted as waste products. 495KJ is 'used' for respiration.

a. How much of the original 1500KJ is stored as chemical energy in the tissue of the cow?
b. The answer to part a is all the energy that can be transferred to a human. Calculate the efficiency of the energy to the human. ​

Which example has gravitational potential energy? a.a horse slowing down from a run b.an apple about to fall from a tree branch c.a bicycle being pedaled down a horizontal path d.beaker sitting on the floor

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?