Any help is greatly appreciated, even if its only one question. Thank you!

1. Many people mistakenly believe that the astronauts that orbit Earth are "above gravity." Calculate g for space shuttle territory 160 km above Earth's surface. Assume Earth's mass is 6.0 1024 kg, and its radius is 6.38 106 m (6380 km). Your answer is what percentage of 9.8 m/s 2?

2. If you stood atop a ladder that was so tall that you were one and a half times as far from Earth's center, how would your weight compare with its present value?

Wnew / Wcurrent =

3. By what factor would your weight change if Earth's diameter were halved and its mass were quadrupled?