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In-s [12.5K]
3 years ago
15

1. The gravitational force acting on a falling body and its weight is constant. But the law of universal gravitation tells us th

at the gravitational force on a body increases as it gets closer to Earth’s center. Is there a contradiction here?
Physics
1 answer:
vagabundo [1.1K]3 years ago
3 0
It's not so much a "contradiction" as an approximation. Newton's law of gravitation is an inverse square law whose range is large. It keeps people on the ground, and it keeps satellites in orbit and that's some thousands of km. The force on someone on the ground - their weight - is probably a lot larger than the centripetal force keeping a satellite in orbit (though I've not actually done a calculation to totally verify this). The distance a falling body - a coin, say - travels is very small, and over such a small distance gravity is assumed/approximated to be constant.
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Question - Which of the following statements is true?

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The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 2.0 rev/s in 10.0 s. At th
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Answer:

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\theta_a = \frac{\omega^2}{2\alpha_a} = \frac{12.57^2}{2*1.257} = 62.8 rad

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0 - \omega^2 = 2\alpha_o\theta_o

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