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
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- Samantha wishes to maintain her weight and goes to the gym to work off the calories she consumed at breakfast that morning. She lifts a 23.0-kg barbell from shoulder level to above her head, through a vertical height of 0.550 m. How many times must she lift the barbell to make up for the 3.15 102 Calories of energy she consumed at breakfast? Note that Calories refers to food calories. (Include lowering the barbell as well.)If the energy conversion efficiencies in a 3 step process are 30% for the first step, 40% for the second, and 20% for the third, the overall efficiency (step one to end) is about: 50% 10% 2% 90% 20% 00000Question 51 of 55 How many tons of coal are needed per day to run a 1000 Mega Watt power plant? One Watt is 1 Joule / second. Joules are units of energy. When coal is burned it releases 21.5 Giga Joules per ton. Only about 45% of this energy is converted to electrical energy. 1 4 7 +/- 2 8 . 3 6 9 O Submit X x 100 +
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