Hydrostatic equilibrium is the balance between ________ of a star and ________.

A. the size; energy production
B. the internal pressure; gravity
C. hydrogen fusion; temperature
D. the internal pressure; energy production


Answer: B

Physics & Space Science

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Free Fall: A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s2. After 4.0 s, the motor turns off but the rocket continues to coast upward with insignificant air resistance. What maximum elevation does the rocket reach?

A. 160 m B. 330 m C. 320 m D. 410 m E. 490 m

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A car travels at 17m/s without skidding around a 35m radius unbanked curve. What is the minimum value of the static friction coefficient between the tires and the road?

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A 4.7-kg solid sphere, made of metal whose density is 4000 kg/ , hangs by a light cord. When the sphere is immersed in water, what is the tension force the cord exerts on the sphere? The density of water is 1000 kg/m3

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How long will it take a charged 80-?F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-? resistor?

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Physics & Space Science