If two large objects are electrically attracted to each other, a) both objects must be negatively charged. b) both objects must be positively charged. c) one object must be negatively charged, and the other object must be positively charged. d) none of the above statements are absolutely true.

conduction, convection, radiation

continuous conducting path for current, power supply

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.