Luz, who is skydiving, is traveling at terminal velocity when she changes position by going headfirst toward the ground

Physics

2 answers:

german3 years ago

7 0

How fast is she going

kicyunya [14]3 years ago

3 0

Answer:

She will speed up because air resistance will decrease and be less than gravity.

Explanation:

As we know that when she is travelling at terminal speed then at that position the force due to gravity on her is counter balanced by the air drag or air friction.

Now as she change her position to head first then in that case the air drag will decrease due to aerodynamic shape

So here in that case net force in downward direction will be more and then will accelerate her downwards.

So we will say that as she will change her position then her speed will increase due to unbalanced force on her

so correct answer will be

She will speed up because air resistance will decrease and be less than gravity.

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3 years ago

80 grams of iron at 100°C is dropped into 200 of water at 20°C contained in an iron vessel of mass 50 gram find the resulting te

vodka [1.7K]

Answer:

the resulting temperature is 23.37 ⁰C

Explanation:

Given;

mass of the iron, m₁ = 80 g = 0.08 kg

mass of the water, m₂ = 200 g = 0.2 kg

mass of the iron vessel, m₃ = 50 g = 0.05 kg

initial temperature of the iron, t₁ = 100 ⁰C

initial temperature of the water, t₂ = 20 ⁰C

specific heat capacity of iron, c₁ = 462 J/kg⁰C

specific heat capacity of water, c₂ = 4,200 J/kg⁰C

let the temperature of the resulting mixture = T

Apply the principle of conservation of energy;

heat lost by the hot iron = heat gained by the water

$m_1c_1 \Delta t_1 = m_2c_2\Delta t_2\\\\m_1c_1 (100 - T) = m_2c_2 (T- 20)\\\\0.08 \times 462 (100-T) = 0.2 \times 4,200 (T-20)\\\\36.96 (100-T) = 840 (T-20) \\\\100 - T = 22.72 (T-20)\\\\100-T = 22.72 T - 454.4 \\\\554.4 = 23.72T\\\\T = \frac{554.4}{23.72} \\\\T = 23.37 \ ^0C$