True or false
1. in a forced air heating system, the warm air circulates by convection. t/f
2. in an internal combustion engine, fuel burns outside the engine in chambers called cylinders.
3. solar energy can be changed into thermal energy without any work being done
4. winds are examples of convection currents

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. the area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?