Upon kicking a ball (d = 22 cm), you noticed that it compressed to 90% of its original volume. If a regulation soccer ball has an average gauge pressure of 12.05 psi, what is the internal energy change (J) experienced by the air inside the ball?
1. Upon kicking a ball (d = 22 cm), you noticed that it compressed to 90% of its original volume. If a regulation soccer ball has an average gauge pressure of 12.05 psi, what is the internal energy change (J) experienced by the air inside the ball?
2. One serving of beef contains 51.5 g of carbohydrates, 37.1 g of proteins, and 127.2 g of fat. The average food energy contents of these components are 9.0 kcal/g for fat and 4 .0 kcal/g for proteins and carbohydrates. An average person (m=50 kg) uses energy at a rate of 510 kcal/h during heavy exercises. You got excited and you ate four servings of beef in one sitting. (1 kcal=4184 J)
A. How long (hrs) do you have to exercise to totally burn your lunch?
B. If you can completely convert the energy you gained into kinetic energy, what should be your average running speed (km/hr) to completely burn your meal?
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