An experiment is called a controlled study because the
person conducting the experiment will be able to control the controllable
variables or factors. The person conducting the experiment can manipulate the variables
other than the independent variables and the number of times the experiment
will be done.
A)
The minimum speed of the electron occurs when the electron loses the maximum energy: this occurs when the electron excites the atom from 0.0 eV to 4.0 eV, because in this case the energy given to the atom is maximum.
The energy given by the electron to the atom is equal to the difference between the two energy levels:
This is equal to the kinetic energy lost by the electron:
where
m is the electron's mass
v is the final speed of the electron after the collision
is the speed of the electron before the collision
Solving for v, we find
B)
The maximum speed of the electron occurs when the electron loses the minimum amount of energy: this occurs when the electron excites the atom from 3.0 eV to 4.0 eV, because in this case the energy given to the atom is minimum.
The energy given by the electron to the atom is equal to the difference between the two energy levels, so in this case we have:
And so, this time the final speed of the electron after the collision will be given by:
Answer:
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Explanation:
If the ground is level, then the snowball can never have
any more kinetic energy than it hand when it left your hand.
If more mass sticks to it as it makes its way across the lawn,
then it must slow down, so that its
KE = (1/2) (present mass) (present speed)²
never exceeds the KE you gave it when you tossed it.
And we're not even talking yet about all the energy it loses
by scraping through the snow and mashing down the blades
of grass in its path.
Momentum P is given by:
Given: m₁ = 62 kg, m₂ = 78.1 kg, v₁ = ?, v₂ = 0 m/s, v₁₊₂ = 1.29 m/s
before:
after:
Since momentum is conserved, the momentum before the collision must be equal to the momentum after the collision.
Solve for v₁.