Provide correct answers please for all questions1.Austin's car engine always gets hot when turned on. One day it does not, so tis thermodynamic efficiency is likely to:A averageB.the leastC. a little higher( not a correct option)D.the most2. CO2 does not decompose into carbon and oxygen spontaneously. Suppose it happened, the total entropy would beA. be unchanged( not a correct option)B.decreaseC.be halvedD.increase

A girl rides a bike. The pedals move a shorter distance than the wheels. In return, she uses __if she turns the wheels directly. O smaller force than O the same force as O bigger force than O half of the force than A mental patient keeps pushing against the wall for a long time. How much work does he do on the wall? O The wall gives him energy. None. O A lot. O Depends on his mass. A girl rides a roller coaster. At the beginning the car was at the high point. After some time, the car slides down to a low point. Assume no friction, at the low point the car kinetic energy should be ___the potential energy at the high point. O less than O more than the same as O double