A ball is thrown directly up in the air from a height of 5 feet with an initial velocity of 60 ft/s. Ignoring air resistance, ho
2 answers:
Answer:
Time, t = 3.8 seconds
Explanation:
It is given that,
A ball thrown up in air from a height of 5 feet.
Initial velocity, v₀ = 60 ft/s
When an object is thrown with initial velocity of v then the equation of motion is given by :
s₀ = height at t = 0, s₀ = 5 ft
Solving above quadratic equation, we get :
t = 3.8 seconds.
Hence, the correct option is (B) " 3.8 seconds ".
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<u>Answer:</u> The mass of sodium acetate that must be added is 30.23 grams
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:
Molarity of acetic acid solution = 0.200 M
Volume of solution = 1 L
Putting values in above equation, we get:
To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:
We are given:
= negative logarithm of acid dissociation constant of acetic acid = 4.74
pH = 5.00
Putting values in above equation, we get:
To calculate the mass of sodium acetate for given number of moles, we use the equation:
Molar mass of sodium acetate = 83.06 g/mol
Moles of sodium acetate = 0.364 moles
Putting values in above equation, we get:
Hence, the mass of sodium acetate that must be added is 30.23 grams