Which of these changes will increase the energy loss of a building? A. an increase in the R-value for the insulation materials used in the building
B. a decrease in the temperature of the outside of the building
C. a decrease in the energy flux (W/m2) of the building
D. an increase in temperature difference between the inside and outside of the building
AND PLEASE DON'T JUST TRY TO TAKE THE POINTS, ANSWER ONLY IF YOU KNOW PLEASE!

Idon’t quite understand this problem

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e