During the first stage of sleep deprivation, the subject may

During the first stage of sleep deprivation the subject will become moody, grumpy or irritable.

Explanation:

There are two kinds of sleep deprivation which are classified as acute and chronic sleep deprivation. The acute one is the kind in which patient cannot sleep for one or two nights but in chronic sleep deprivation patient miss the seven hours of sleep per night in a week.

Dr. Ruiz further classified the stages of sleep deprivation as:

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

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

isoceles right angled triangle