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igor_vitrenko [27]
3 years ago
8

the magnitude of the normal force acting on a person with a mass of 70 kg standing at rest on the flat ground would be

Physics
2 answers:
Virty [35]3 years ago
6 0

Answer: 700 Newtons

Explanation:

The normal force=mg in this scenario (I'm using g=10m/s^2). Plugging in 70 kilograms into the equation will result in a normal force of 700 newtons.

valentinak56 [21]3 years ago
6 0

Answer:70 n

Explanation:

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Water flows through a horizontal nozzle in steady flow at the rate of 10m3/s. The inlet and outlet diameters are d1 = 0.5m and d2
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Answer:

P₁ = 2.215 10⁷ Pa, F₁ = 4.3 106 N,

Explanation:

This problem of fluid mechanics let's start with the continuity equation to find the speed of water output

        Q = A v

        v = Q / A

The area of ​​a circle is

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       v₁ = Q / A₁ = Q 4 /π d₁²

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Now we can use Bernoulli's equation in the colon

       P₁ + ½ ρ v₁² + ρ g y₁ = P₂ + ½ ρ v₂² + ρ g y₂

Since the tube is horizontal y₁ = y₂. The output pressure is P₂ = Patm = 1.013 10⁵ Pa, let's clear

       P₁ = P2 + ½ rho (v₂² - v₁²)

      P₁ = 1.013 10⁵ + ½ 1000 (203.72² - 50.93²)

      P₁ = 1.013 10⁵ + 2.205 10⁷

      P₁ = 2.215 10⁷ Pa

la definicion de presion es

      P₁ = F₁/A₁

     F₁ = P₁ A₁

     F₁ = 2.215 10⁷ pi d₁²/4

     F₁ = 2.215 10⁷ pi 0.5²/4

     F₁ = 4.3 106 N

     

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