In the presence of air resistance, a watermelon is launched into the air with 100 j of kinetic energy.
Its kinetic energy is less than 100 J when it reaches its starting point. Its kinetic energy decreases as it encounters air resistance and returns to its starting point. In actuality, some of the energy has been lost because of air resistance. Since we use the ball's original height as a point of reference, there is no potential energy when the ball is in its initial state of motion, and K is its kinetic energy. This total energy is conserved if there is no air resistance, therefore when the ball returns to its starting position, its kinetic energy will remain at 100.
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Answer:
heart rate increases during activity
Explanation:
You can work at 70 to 85 percent of your maximum heart rate during vigorous activity.
Answer: 9.9999872 C
Explanation: In to answer this question we have to use the charge of the electron, that is eqaul to -1.6*10^-19 C.
After that, we have to calculate the charge given by 8.0*10^13 electrons, then we an additional charge of: 8.0*10^13 * -1,6*10^-19 C=1.28*10^-5C
Finally the net charge of the metal sphere, initially charged by +10C is:
10C-1.28*10^-5C=9.9999872 C
Gold is a pure substance that can be found on the periodic table of elements.
