In this ecosystem, squirrels find and eat acorns from trees. What would happen to the balance of the ecosystem if populations of
squirrels decreased?
A.) The number of acorns would increase.
B.) The number of acorns would decrease.
C.) The number of acorns would stay the same.
D.) The number of acorns would decrease and then increase.
A.) The number of acorns would increase.
B.) The number of acorns would decrease.
C.) The number of acorns would stay the same.
D.) The number of acorns would decrease and then increase.
1 answer:
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The mass of a radioactive element at time t is given by
where
is the mass at time zero, while 
is the half-life of the element.
In our problem,
, t=121.0 s and 
, so we can find the initial mass :
where
In our problem,
Answer:
Yes, since the choice of the zero o potential energy is arbitrary.
Explanation:
The kinetic energy is due to the motion of the object. The expression for the kinetic energy is as follows;
Here, m is the mass of the object and v is the velocity of the object.
The kinetic energy can not be negative as the velocity is squared. It can be zero and positive.
Potential energy: It is the energy is due to the position of the object.
The expression for the potential energy is as follows;
PE= mgh
Here, g is the acceleration due to gravity and height.
Height can be taken from the reference point, zero which can be taken below zero and above zero. Zero is taken as origin. Below zero, the height is taken as negative and above zero, the height is taken as positive.
The potential energy can be zero, positive and negative.
The total energy is the sum of kinetic energy and potential energy.
E= KE + PE
Here, KE is the kinetic energy and PE is the potential energy.
Therefore, the option (B) is correct.