By Benjamin Crowell
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Extra info for 7-Simple Nature
Our present approach, however, only requires that we give a way to test for equality of masses. To predict the recoil velocity from scratch, we’d need to use conservation of momentum, which is discussed in a later chapter. 1 Mass 55 Astronauts spending long periods of time in space need to monitor their loss of bone and muscle mass, and here as well, it’s impossible to measure gravitational mass. Since they don’t want to have standard kilograms thrown at them, they use a slightly different technique (figures d and e).
6 Convert 134 mg to units of kg, writing your answer in scientific notation. Solution, p. 858 7 In the last century, the average age of the onset of puberty for girls has decreased by several years. Urban folklore has it that this is because of hormones fed to beef cattle, but it is more likely to be because modern girls have more body fat on the average and possibly because of estrogen-mimicking chemicals in the environment from the breakdown of pesticides. 2 ng of estrogen (about double the amount of natural beef).
That means the cost of transporting one tomato is comparable to the cost of the tomato itself. Transportation really adds a lot to the cost of produce, I guess. The problem is that the human brain is not very good at estimating area or volume, so it turns out the estimate of 5000 tomatoes fitting in the truck is way off. That’s why people have a hard time at those contests where you are supposed to estimate the number of jellybeans in a big jar. Another example is that most people think their families use about 10 gallons of water per day, but in reality the average is about 300 gallons per day.