An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Multiply the number of acres by the price per acre.
Calculate: 640 × 6500 .
The result is 4 , 160 , 000 .
The purchase price is $4 , 160 , 000 .
Explanation
Problem Analysis We are given that a 640-acre farm is being sold for $6,500 per acre. We need to find the total purchase price of the farm.
Setting up the Calculation To find the total purchase price, we need to multiply the number of acres by the price per acre. That is: Purchase Price = Number of Acres × Price per Acre In this case, the number of acres is 640 and the price per acre is $6,500.
Calculating the Purchase Price Now, we perform the multiplication: Purchase Price = 640 × 6500 = 4 , 160 , 000 So, the purchase price is $4,160,000.
Final Answer The purchase price of the farm is $4,160,000.
Examples
Understanding the cost of land is crucial in many real-world scenarios. For instance, if you're planning to invest in real estate, knowing how to calculate the total cost based on the price per unit area (like acres) helps you determine the financial feasibility of your investment. Similarly, farmers use this calculation to assess the value of their land for sale or collateral. This basic multiplication skill is also applicable when calculating the cost of materials priced per unit, such as flooring or tiling for a home renovation project. Knowing how to perform these calculations accurately ensures sound financial decisions in various practical situations.
A current of 15.0 A flowing for 30 seconds results in a total charge of 450 coulombs. This charge corresponds to approximately 2.81 × 10²¹ electrons flowing through the electric device. The calculation shows the direct relationship between current, charge, and the number of electrons involved.
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