Suppose that a spacecraft goes into orbit about an unknown moon. suppose that the altitude (above the surface) at periapsis is 1000 km (kilometers) and at apoapsis the altitude (above the surface) is 5000 km. suppose that the radius of the moon is approximately 1000 km. the period of the vehicle’s orbit about the moon is 9.5 hours. estimate the mass of this moon. the universal gravitational constant is g

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you