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Q1. A railroad flatcar is loaded with crates. The coefficient of static friction between the crates and the floor is 0.23. If the train is moving at 45.50 km/hr, in how short the distance can the train be stopped with a constant acceleration without causing crates to slide?

Q2. A steel aircraft carrier is 385 m long when moving through the icy North Atlantic at a temperature of 1.65°C. By how much does the carrier lengthen whereas it is travelling in the warm Mediterranean Sea at the temperature of 23.30°C?

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