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:

Trend and Seasonality

Components of time series data analysis, where trend refers to the long-term movement, and seasonality refers to patterns within a fixed period.

Deseasonalized Time Series

A time series from which seasonal effects have been removed, allowing for the clearer identification of trends and patterns.

Cyclical Effects

Economic or market changes that occur in predictable cycles, often related to changes in business activity, interest rates, and economic policies.

Weekly Seasonal Indexes

Indicators that measure the variability in data or phenomena on a weekly basis to account for and predict seasonal variations.