A Roller-Coaster Car Has a Mass of 500 Kg When

question 55

Multiple Choice

A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?

• A) 7.0 kN up
• B) 7.0 kN down
• C) 2.8 kN down
• D) 2.8 kN up
• E) 5.6 kN down

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Definitions:

Symbiosis

An interaction between two different organisms living in close physical association, typically to the advantage of both.

Mutualism

A type of symbiotic relationship between two species where both species benefit from the interaction.

Secondary Succession

The process of ecological recovery in an area where a biological community was partially removed but where soil remains.

Primary Succession

Ecological succession that occurs in an environment in which new substrate devoid of vegetation and usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited.