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finlchey3860
08.03.2020 •
Physics
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Ответ:
Explanation:
The total surface area is:
A = 2πr² + 2πrL
A = 2π (3.3 cm)² + 2π (3.3 cm) (12 cm)
A = 317.24 cm²
If ρ is the mass per area density in g/cm², then:
m = ρA
50 g = ρ (317.24 cm²)
ρ = 0.158 g/cm²
(a) The mass of the lid is:
m = ρA = ρ πr²
m = (0.158 g/cm²) (π (3.3 cm)²)
m = 5.39 g
(b) The mass of the shell is:
M = ρA = ρ 2πrL
M = (0.158 g/cm²) (2π (3.3 cm) (12 cm))
M = 39.22 g
(c) The moment of inertia of the lid/bottom is I = 1/2 mr².
The moment of inertia of the shell is I = Mr².
The total moment of inertia is:
I = 1/2 mr² + Mr² + 1/2 mr²
I = (m + M) r²
I = (5.39 g + 39.22 g) (3.3 cm)²
I = 485.78 g cm²
Ответ:
20000 pounds
Explanation:
Generally 1 gallon of fuel burnt gives of 20 pounds of CO₂
Difference in the gallons of fuel burnt
The 20 mpg car burns 1000 gallons of fuel more than the 30 mpg car
The amount of CO₂ would be
The fewer pounds that the 30 mpg car would release is 20000 pounds