urgent help with Physics problem?

Posted on 2016-03-26 14:50:00 in Physics by JENNY BOL

The International Space Station (ISS) orbits Earth in a nearly circular orbit that is 345 km above Earth's surface. 

1) How many hours does it take for the ISS to make each orbit? (Express your answer to three significant figures.) 

2) Some of the experiments performed by astronauts in the ISS involve the effects of "weightlessness" on objects. What gravitational force does Earth exert on a 18.0-kg object in the ISS? Express your answer in newtons. (Express your answer to three significant figures.) 

3) What gravitational force does Earth exert on a 18.0-kg object in the ISS? Express your answer as a fraction of the force that Earth would exert on the object at Earth's surface. (Express your answer to three significant figures.)

The former Soviet Union launched the first artificial Earth satellite, Sputnik, in 1957. Its mass was 84 kg, and it made one orbit every 96 min. 

11) Determine the altitude of Sputnik’s orbit above Earth's surface, assuming circular orbits. (Express your answer to two significant figures.) 

22) What was Sputnik's weight in orbit? (Express your answer to two significant figures.) 

33) What was Sputnik's weight at Earth’s surface? (Express your answer to two significant figures.)

---

Answer Comment

No Answers Posted Yet.