Saturns moon Titan has a mass of 1.45*10^23 kg and a radius of 2580 km. What is the free fall acceleration on Titan?

The existence of the dwarf planet Pluto was proposed based on irregularities in Neptune's orbit. Pluto was subsequently discovered near its predicted position. But it now appears that the discovery was fortuitous, since Pluto is small and the irregularities in Neptune's orbit were not well known. Answer the following to illustrate that Pluto has a minor effect on the orbit of Neptune compared with other planets. (a) Calculate the acceleration of gravity at Neptune due to Pluto when they are 3.8 x 1012 m apart. The mass of Pluto is 1.3 x 1022 kg. = 915 m/s² (b) Calculate the acceleration of gravity at Neptune due to Uranus, when they are 3.8 x 1012 m apart. The mass of Uranus is 8.68 x 1025 kg. 92 = m/s² Give the ratio of this acceleration to that due to Pluto. 92 91

A potential difference of 81 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell?_______________________J

A synchronous satellite, which always remains above the same point on a planet's equator, is put in circular orbit around Jupiter so that scientists can study a surface feature. Jupiter rotates once every 9.84 h. Use the data of this table to find the altitude of the satellite.