Linear Speed Physics Question and free fall acceleration...Please Look?

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1) A 0.40-kg mass, attached to the end of a 0.90 -m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 425 N, then what maximum linear speed can the mass have if the string is not to break?

thank-you very much

2) An object of mass 0.50 kg is transpoted to the surface of Planet X where the object's weight is measured to be 30 N. The radius of the planet is 4.0 x 10^6 m. What free fall acceleration will the 0.50 kg object experience when transported to a distance of 1.0 x10^6 m from the surface of this planet?
 
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