CO2 Emissions as an Inflow to the Atmospheric CO2 Stock

A city's reservoir currently holds 50 million gallons of water. During a rainstorm, a river adds water to the reservoir at a rate of 1 million gallons per hour. In this scenario, what does the '1 million gallons per hour' figure represent?

Bookstore Inventory Management

Identifying an Inflow in a Personal Finance Context

A technology company starts the year with 500 employees. Over the year, they hire 75 new employees and 30 employees leave the company. The statement 'The inflow to the company's employee stock is 45 employees for the year' is true.

Each scenario below describes a 'stock' (an accumulated quantity) and various related figures. Match each scenario with the correct 'inflow' (the rate at which the stock is being filled).

Modeling a Real-World System

Library Collection Dynamics

A popular video-sharing app had 10 million active users at the beginning of the year. Throughout the year, it attracted new users at an average rate of 200,000 per month. In this system, the rate of 200,000 new users per month is best described as the ______ to the stock of active users.

A factory's warehouse is being stocked with new products. Arrange the following statements to correctly describe the logical sequence of how the inventory level changes.

At the beginning of the year, a company's grain silo contains 10,000 tons of wheat. Throughout the year, the company's farms harvest and add 500 tons of wheat to the silo each month. During the same period, the company sells and ships out 300 tons of wheat from the silo each month. Which of the following correctly identifies the inflow for this system?