An astronaut with a mass of 110 kg visits the moon (which has a different gravitational force than Earth). The astronaut climbs 5 m up the ladder into his spacecraft and gains 880 J in GPE. What is the strength of gravity on the moon?

The figure below shows a picture of American astronaut Clay Anderson experiencing weightlessness onboard the International Space Station.

(a) Most people have the misconception that a person in a spacecraft is weightless because he or she is no longer affected by gravity. Show that this premise cannot be true by computing the gravitational field of the Earth at an altitude of 200 km, the typical altitude of a spacecraft in orbit. Compare this result with the gravitational field on the surface of the Earth.

(b) Why would astronauts in orbit experience weightlessness even if they are experiencing a gravitational field (and therefore a gravitational force)?

AN ASTRONAUT WITH A MASS OF 70 KG IS SENT TO LAND ON PLANET X,WHICH IS 56 MILLION KILOMETERS AWAY. THE SPACECRAFT CAN TRAVEL AT AMAX VELOCITY OF 7.0 TIMES 10 TO THE 5th POWER KM/H. PLANET X ISSLIGHLTY SMALLER THAN EARTH, WITH A RADIUS OF 3400 KM AND A MASS OF6.4 TIMES 10 TO THE 23RD POWER KG.

A.) HOW LONG WILL IT TAKE TO GET TO PLANET X?

B.) WHAT IS THE VALUE OF g ON PLANET X?

C.) WHAT IS THE ASTRONAUT'S WEIGHT ON PLANET X?