An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Approximately 2.81 billion billion electrons flow through the electric device delivering a current of 15.0 A for 30 seconds. This is calculated using the current, time, and the charge of a single electron. The total charge is first calculated as 450.0 C, which leads to the final number of electrons flowing through the device.
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Calculate the total number of squirrels entering the population: T o t a l in = 4 + 10 = 14 .
Calculate the total number of squirrels leaving the population: T o t a l o u t = 2 + 8 + 3 + 3 = 16 .
Calculate the net change in the population: N e t c han g e = 14 − 16 = − 2 .
Since the net change is negative, the population growth is decreasing. The final answer is Population growth is decreasing.
Explanation
Understanding the Problem We are given data about a squirrel population, including the number of squirrels born, immigrated, died from predation, died from disease, left to find food, and left to find a mate. Our goal is to determine whether the population is increasing, decreasing, staying the same, or reaching carrying capacity.
Calculating Total Squirrels Entering First, we need to calculate the total number of squirrels entering the population. This includes squirrels that were born and squirrels that immigrated. From the table, we have:
Number of squirrels born = 4 Number of squirrels immigrated = 10
So, the total number of squirrels entering the population is: T o t a l in = 4 + 10 = 14
Calculating Total Squirrels Leaving Next, we need to calculate the total number of squirrels leaving the population. This includes squirrels that died from predation, died from disease, left to find food, and left to find a mate. From the table, we have:
Number of squirrels died from predation = 2 Number of squirrels died from disease = 8 Number of squirrels left to find food = 3 Number of squirrels left to find a mate = 3
So, the total number of squirrels leaving the population is: T o t a l o u t = 2 + 8 + 3 + 3 = 16
Calculating Net Change in Population Now, we calculate the net change in the squirrel population by subtracting the total number of squirrels leaving from the total number of squirrels entering: N e t c han g e = T o t a l in − T o t a l o u t = 14 − 16 = − 2
Determining Population Trend Since the net change is -2, this means that the population decreased by 2 squirrels over the year. Therefore, the population growth is decreasing.
We cannot determine if the population is reaching carrying capacity with the given data. Carrying capacity depends on environmental factors such as resource availability, which are not provided in the table.
Conclusion Based on our calculations, the squirrel population is decreasing.
Examples
Understanding population dynamics is crucial in wildlife management. For example, if a squirrel population is decreasing, conservationists might investigate the causes, such as habitat loss or increased predation. They could then implement strategies like habitat restoration or predator control to help the population recover. This type of analysis is also used in fisheries management to ensure sustainable harvesting and in agriculture to manage pest populations.
