Hello! I am not that good at these things but I think that the answer is A
Control group in a scientific experiment is a group separated from the rest of the experiment, it is where the independent variable being tested cannot influence the results. It isolates the independent variable's effects on the experiment and can helps rule out alternative explanations of the experimental results.
Answer:
the acceleration of the girl is 8 m/s² in opposite direction.
Explanation:
Given;
mass of the girl, m₁ = 30kg
mass of the boy, m₂ = 40 kg
acceleration of the boy, a₂ = 6 m/s²
let acceleration of the girl = a₁
Apply Newton's third law of motion;
the force exerted by the girl is equal in magnitude to the force exerted by the boy but in opposite direction.
F₁ = -F₂
m₁a₁ = -m₂a₂
30a₁ = -(40 x 6)
30a₁ = -240
a₁ = -240 / 30
a₁ = -8 m/s² (the negative sign shows that the acceleration is in opposite direction)
Thus, the acceleration of the girl is 8 m/s² in opposite direction.
Answer:
Explanation:
According to the <u>law of universal gravitation</u>, which is a classical physical law that describes the gravitational interaction between different bodies with mass:
Where:
is the module of the force exerted between both bodies
is the universal gravitation constant.
and are the masses of the pencil and the teenager, respectively.
is the distance between both bodies
Solving for :
This is the force of gravitational attraction between the pencil and the teenager, which is very small in this case
Answer:
mass
Explanation:
the matter is measured in kg or lb and we can use a scale in order to obtain it. This parameter is called "the mass of an object"