Experimentalmente, observa-se a existência de uma força com propriedades semelhantes às da força gravitacional. Essa força elétrica e os corpos que sofrem forças elétricas apresentam uma propriedade chamada carga elétrica. Considerando-se duas cargas elétricas pontuais e iguais que se repelem com uma força de intensidade 1,6N quando colocadas a 3,0cm de distância no vácuo onde a constante elétrica k igual a 9,0.10>9Nm²/C², o valor absoluto de suas cargas elétricas, em nC, é igual a

The magnets would be | n s | and | s n|

Ibelieve the answer is arteries

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.