PLS ANSWER FAST!! Which action would help an air-conditioner use less energy on a hot, sunny summer day?

A.
Turning on lights and heat-producing appliances

B.
Covering the roof with dark-colored materials

C.
Covering the roof with light-colored materials

D.
Opening the curtains to allow more sunlight in

A55-kg pilot flies a jet trainer in a half vertical loop of 1200-m radius so that the speed of the trainer decreases at a constant rate. knowing that the plane has a speed of 550 km/h at point a, and the pilot experiences weightlessness at point c (i.e., the normal force from the seat bottom is zero), determine (a) the deceleration of the plane, (b) the force exerted on her by the seat of the trainer when the trainer is at point b.