Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N. What is the mass M? 
Definitions:
Present Value
The current worth of a future sum of money or stream of cash flows given a specified rate of return.
Extraction Costs
The expenses associated with the process of removing raw materials from the earth for use in production or consumption.
Fishery Collapse
A rapid decline in a fishery’s population because its fish are being harvested faster than they can reproduce.
Harvesting Rates
The speed at which natural resources are extracted or harvested, impacting sustainability and future availability.
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