Now, letâs get down to business â the cost! They do offer a 30 day free trial and then after that it is $7.95 a month or $79 a year. After just a few weeks of Nathan playing, I personally feel that the $7.95 a month is totally worth it!
A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.
    'Weight' is a force due to gravity and, therefore, is  measured in newtons in SI. Weight is measured using a spring  balance, calibrated in newtons.Because weight is affected by  gravity, an object of given mass will have a different weight,  according to where it is measured.     'Mass', on the other hand, is measured in kilograms in SI.Mass is  measured by comparing an object of unknown mass with a known mass,  using a scales balance. kilogram is 2.2 lbs, so it is more useful for everyday objects. Things such as â¦ people, furniture, cars, etc. could be measured in kilograms while objects like paper, small amounts of gold, or mail could be measured in grams. 1 kilogram is equal to 1000 grams.