1 Profile Mech @ 0.7 Alex zhong ressor for a jackhammer expands the air at a constant pressure of 8.6x105 Pa. The increase in the cylinder's is 4.0x104 m'. During the process, 14.0 ] of energy is transferred out of the cylinder as heat. What work is done by the expanding air? What is the change in internal energy of the air? c. What is the efficiency of the jackhammer? (Yes, you have enough information to find this.) d. Is this efficiency possible? Explain. e. Is this efficiency useful? Explain