جواب:
#bar J = 5،656 "N.s" #
وضاحت:
#bar J = int F (t) * d t #
# F = m * a = m * (d v) / (d t) #
#bar J = int m * (d v) / (d t) * d t #
#bar J = m int d v #
#d v = (4cos4t -13sin13t) * d t #
#bar J = M int (4cos4t-13sin13t) * d t #
#bar J = m (sin4t + cos13t) #
#bar J = 8 (گناہ 4 * 3pi / 4 + cos13 * 3pi / 4) #
# بار J = 8 * (0 + 0،707) #
# بار J = 8 * 0،707 #
#bar J = 5،656 "N.s" #