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Two stars of equal mass orbit one another. (This is called a binary star system.) If...

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Physics

Two stars of equal mass orbit one another. (This is called abinary star system.) If the stars’ orbits have a semimajor axis of2.5x10^8 km and complete one orbit every 2.4 years, what is themass of each star? pick from: (8.1x10^29 kg, 1.6x10^30 kg,8.1x10^20 kg, 1.6x10^21 kg)

A satellite orbits a planet at a distance r. If it has acircular orbit, the total energy (E=K+U) of the satellite is equalto:

Hint: F_centripetal=mv^2/r pick from: (E=0, E=-U/2, E=U,E=U/2)

A probe is brought to rest a distance of 1.5x10^11 m from theSun, and allowed to fall directly into the Sun. How fast will theprobe be moving when it collides with the Sun? The mass of the Sunis 2.0x10^30 kg, and its radius is 7.0x10^8 m. Hint: Considerenergy conservation. pick from: (620 km/s, 42 km/s, 1.8x10^6 km/s,3.8x10^5 km/s)

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