Please help!! 20 points!!
2 answers:
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Answer:
The terminal speed is 74.833 m/s
Explanation:
The drag force is equal to square of speed:
Fdrag = k*v²
According Newton`s law:
Fnet = m*a
m*g - k*v² = m*a
If terminal speed, the net force is zero.
Answer:
Heat transfer during the process = 0
Work done during the process = - 371.87 KJ
Explanation:
Initial pressure = 0.02 bar
Initial temperature = 200 K
Final pressure = 0.14 bar
Gas constant for helium R = 2.077
This is an isentropic polytropic process so temperature - pressure relationship is given by the following formula,
=
Put all the values in above formula we get,
⇒ =
⇒ = 1.74
⇒ = 348.72 K
This is the final temperature of helium.
For isentropic polytropic process heat transfer to the system is zero.
⇒ ΔQ = 0
Work done W = m × ( -
) ×
⇒ W = 1 × ( 200 - 348.72 ) ×
⇒ W = 371.87 KJ
This is the work done in this process. here negative sign shows that work is done on the gas in the compression of gas.
In the reaction between 1 molecule of bromine and 2 molecules of potassium chloride, there are six atoms in the products.
Let's consider the balanced equation for the reaction between 1 molecule of bromine and 2 molecules of potassium chloride. This is a single replacement reaction.
Br₂ + 2 KCl ⇒ 2 KBr + Cl₂
We obtain as products, 2 molecules of potassium bromide and 1 molecule of chlorine.
- 1 molecule of KBr has 2 atoms, so 2 molecules contribute with 4 atoms.
- 1 molecule of Cl₂ has 2 atoms.
- The 4 atoms from KBr and the 2 atoms from Cl₂ make a total of 6 atoms.
In the reaction between 1 molecule of bromine and 2 molecules of potassium chloride, there are six atoms in the products.
Learn more: brainly.com/question/21850455
