Which type of electromagnetic wave enables skin cells to produce vitamin d

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

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 equation 2: 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!

Convection occurs when thermal energy is transferred by the movement of