plz help,,, solving this questions

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ورد فى الكتاب المدرسى
الاسئله العامه على الترم الاول لماده العلوم
الصفحه 86
first question:
no.8- the wight of aperson in a ballon at certain hieght from earth surface equal=70 newton what is the wight of this person on earth surface?
newton-69
newton-70
newton-68
71 newton




no-11.... all the following from the properties of mercury as thermometrical substance except:
a- good conductor of heat
b- its expansion is regular
c- give limited extent to measure the temperature
d- not adhere to walls of the capillary tube

برجاء المساعده ف الحل مع التعليل وشكرا لاحلى منتدى جزاكم الله خيرا