I think the correct answer would be the third option. The criteria that could help Linda in classifying whether the gases are greenhouse gases would be gas molecules having at least one oxygen atom. Most of the greenhouse gases has an oxygen atom in their structures especially those that naturally occurs. These gases are CO2, H2O vapor and nitrous oxide.
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Answer:
The answer to your question is Ke = 72 J
Explanation:
Kinetic energy depends on the speed of and object and its mass.
Data
mass = m = 4 kg
speed = v = 6 m/s
distance = d = 8 m
Kinetic energy = ke = ?
Formula
Ke = (1/2) mv²
Substitution
Ke = (1/2) (4)(6)²
Simplification
Ke = (1/2)(4)(36)
Ke = (1/2)(144)
Ke = 72 Joules
Result
Ke = 72 J
Efficiency is defined as the measure of the amount of work or energy is conserved in a certain process. At all times, in every process, work or energy is always lost or wasted due to certain interference. Not all work given is converted to useful work or energy. Thus , efficiency is calculated by dividing the energy or work output to the energy or work input then the value is multiplied by 100 to express efficiency as percentage.
Efficiency = work output / work input
Efficiency = (1020 J / 1200 J) = 85%
Answer:
v₁ = u₁/2√3 ≈ 0.866u₁
v₂ = u₁/2 = 0.5u₁
θ = 60°
Explanation:
let u₁ be the initial velocity of the first ball
let v₁ be the final velocity of the first ball
let v₂ be the final velocity of the second ball
For elastic collisions, the angle between the departing masses is 90°
assume the first ball initially moves along the x axis in the positive direction
conservation of momentum
In the y direction, initial momentum is zero
After the collision
mv₁sin30 = mv₂sin60
½v₁ = ½√(3)v₂
v₁ = √(3)v₂
in the x direction,
mu₁ = mv₁cos30 + mv₂cos-60
u₁ = v₁cos30 + v₂cos60
u₁ = (√(3)v₂)½√(3) + ½v₂
u₁ = 2v₂
v₂ = u₁/2
v₁ = √(3)v₂ = √(3)(u₁/2)