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Need help with only Part C

Need help with only Part C

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Need help with only Part C

4. a. A weightlifter curls a 100 kg bar, raising it each time a distance of 0.61 m. How many times must he repeat this exercise to burn off all the energy in one energy bar that contains 22 g of carbohydrates? You can assume 25% efficiency and use g = 9.8 m/s². [Watch out: need to burn off ALL energy!] [Answer in whole integer] TABLE 11.1 Energy in fuels Fuel Hydrogen Gasoline Fat (in food) Coal Carbohydrates (in food) Wood chips Energy in 1 g of fuel (in kJ) 121 44 38 27 17 15
Transcribed Image Text:4. a. A weightlifter curls a 100 kg bar, raising it each time a distance of 0.61 m. How many times must he repeat this exercise to burn off all the energy in one energy bar that contains 22 g of carbohydrates? You can assume 25% efficiency and use g = 9.8 m/s². [Watch out: need to burn off ALL energy!] [Answer in whole integer] TABLE 11.1 Energy in fuels Fuel Hydrogen Gasoline Fat (in food) Coal Carbohydrates (in food) Wood chips Energy in 1 g of fuel (in kJ) 121 44 38 27 17 15
C. Determine the minimum angle at which a road should be banked so that a car travelling at 20 m/s can safely round the curve without the aid of friction. The radius of the curve is 200.0 m. [Answer in 3 significant figures]
Transcribed Image Text:C. Determine the minimum angle at which a road should be banked so that a car travelling at 20 m/s can safely round the curve without the aid of friction. The radius of the curve is 200.0 m. [Answer in 3 significant figures]
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