Researchers at a university want to know if higher levels of nitrogen in fertilizer will increase the
production of tomatoes per plant. twenty plants are given normal levels of nitrogen and twenty
other plants are given ten percent higher levels throughout the growing season. the plants
receive the same levels of sunlight, water and are planted in the same soil on one farm. at the
end of the experiment the average number of tomatoes produced is the same for each group.
the scientists repeat the experiment on two additional farms further south that season. the
researchers conclude that increasing nitrogen levels by 10% in tomatoes is not beneficial.

would this be a well-designed, reliable experiment? support your decision with at least three
reasons.

On the galapagos islands charles studied finches

    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

Answeroutward from: source;