Answer:
The force is calculated as 338.66 N
Explanation:
We know that force is given by

We know that range of a projectile is given by

it is given that R=130 m applying values in the above equation we get

Thus the force is obtained as

Thus force equals 
Answer:
this may be wrong but I am not sure
Answer:
67.1 atm
Explanation:
From Dalton's law of Partial Pressures, the total partial pressure equals the sum of the individual partial pressures.
P = P₁ + P₂ + P₃
P₁ = 38.39 atm of O₂
P₂ = 3.38 atm of He
P₃ = 25.33 atm of N₂
So, P = P₁ + P₂ + P₃ = 38.39 atm + 3.38 atm + 25.33 atm = 67.1 atm