Lead Has a Latent Heat of Fusion of 2

question 70

Multiple Choice

Lead has a latent heat of fusion of 2.32 × 10⁴ J/kg, and a specific heat of 128 J/(kg K) , and a melting point of 228°C. The ambient temperature is 16°C. A 30-g lead bullet hits a solid surface and comes to a complete stop. What would the velocity of the bullet have to be in order for it to melt completely when it hits the wall, assuming that all its kinetic energy is transformed into heat?

• A) 207 m/s
• B) 215 m/s
• C) 232 m/s
• D) 273 m/s
• E) 318 m/s

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Definitions:

Marginal Resource Cost

Marginal resource cost is the additional cost incurred by producing one more unit of a good or service.

Marginal Revenue Product

The extra income produced by the use of an additional unit of a resource, like labor or capital.

Total Output

The total quantity of goods or services produced by an economic entity in a given period.

Marginal Productivity Theory

An economic theory that suggests the wage or value of a worker's output is equal to the additional production the worker generates.