Physics, 13.10.2019 22:10 jocelyn7575

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Answer from: abhibhambhani

1) B a compound

2) C a heterogeneous mixture

3) A an element

Explanation:

1) I know this because a compound is mixture of different elements which cannot be identified by the naked eye. And from the statement above the substance is distinguished to have to different elements by its chemical formula.

2) I know this because a heterogeneous mixture is a mixture composed of two or more elements which can easily be seen by the physical eye or can be distinguished easily.

3) I know this because noble gases are not a mixture of any kind. They are elements. Elements are substances that cannot be broken down into simpler substances.

Answer from: Quest

no simpler subs form complex ones. synthesise = make

Answer from: Quest

m₁v₁ + m₂v₂ = (m₁ + m₂)vmomentum is conserved.the left-hand side of the equation represents the momentum in the system before the collision.the right-hand side represents the momentum in the system after the collisionm₁ and v₁ represents the mass and the velocity of the physics blockm₂ and v₂ represents the mass and velocity of the ball of puttyv represents the final velocity of the combined mass.the question states the two masses stick together. they combined mass has its own velocity with the body mass the sum of the two objects' massestheir combined momentum is (m₁ + m₂)vto find the magitude of (m₁ + m₂)v, we need to add the vectors on the left-hand side of the equation: m₁v₁ + m₂v₂.note the diagram. i have positioned the vectors in accordance with their directions.the magnitude of the resultant can be calculated using the pythagorean theorem since this is a right triangle situation (north and west are perpendicular)|(m₁ + m₂)v| = √[ (m₁v₁)² + (m₂v₂)² ]|(m₁ + m₂)v| = √[ (1.5kg·8.0m/s)² + (0.40kg·20m/s)² ]|(m₁ + m₂)v| = 14.4 kg m/sfor two significant figures (assuming that 20m/s is two), this rounds to 14 kg m/s

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