If You Measure the Velocity of a Cloud of Gas

question 57

Multiple Choice

If you measure the velocity of a cloud of gas that is rotating around the center of a galaxy in a circular orbit with radius R, you can determine the

• A) total mass of the galaxy.
• B) mass of the stars and gas in the galaxy.
• C) mass of the galaxy enclosed within the radius R.
• D) mass of the galaxy located outside the radius R.
• E) mass of luminous matter within the radius R.

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Definitions:

Marginal Revenue

The additional income earned from selling one more unit of a good or service.

Demand Elasticity

The measure of how much the quantity demanded of a good responds to a change in the price of that good, reflecting consumer sensitivity to price changes.

Marginal Revenue

The additional income earned from selling one more unit of a product or service.

Demand Inelastic

A situation where the demand for a product does not change significantly with a change in price.