Two Masses Are Connected by a String Which Passes Over

question 121

Multiple Choice

Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The magnitude of the acceleration of the 4.00 kg mass is (the initial velocity of the 6.00 kg mass is down the incline)

• A) 7.16 m/s².
• B) 5.84 m/s².
• C) 2.98 m/s².
• D) 1.53 m/s².
• E) 3.90 m/s².

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Definitions:

Marginal Revenue

The financial gain from disposing of one extra unit of a product or service.

Average Revenue

The amount of income generated per unit of sale or the total income divided by the number of units sold.

Purely Competitive Seller

A seller in a market that has many buyers and sellers, with all firms selling identical products and no barriers to entry.

Marginal Revenue

The boost in revenue experienced by a company when it sells an extra unit of its goods or services.