At what distance from the pier will the boat be in 15 s, moving along the river, if the speed of the current

| April 27, 2021 | education

At what distance from the pier will the boat be in 15 s, moving along the river, if the speed of the current is 4 m / s? 2) what is the mass of 10 liters of gasoline if the density of gasoline is 700 kg / m3? 3) express the pressure of 10 kPa in pascals. 4) calculate the water pressure at a depth of 10 m.

t = 15 s.
V = 4 m / s.

S -?

S = V * t

S = 4 m / s * 15 s = 60 m.

Answer: the boat will be at a distance of S = 60 m from the pier.

V = 10 l = 10 * 10 ^ -3 m3.
ρ = 700 kg / m3.

m -?

m = V * ρ.

m = 10 * 10 ^ -3 m3 * 700 kg / m3 = 7 kg.

Answer: gasoline has a mass of m = 7 kg.

3) P = 10 kPa = 10 * 10 ^ 3 Pa = 10000 Pa.

4) ρ = 1000 kg / m3.

g = 10 N / kg.

h = 10 m.

R – ?

P = ρ * g * h.

P = 1000 kg / m3 * 10 N / kg * 10 m = 100000 Pa = 100 kPa.

Answer: the water pressure is P = 100 kPa.



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