How much force is needed to prevent a body of mass 10 kg from falling

When flexing to a reflective style, one should be specific, brief and to the point, and maintain a fast and decisive pace?

When and why was the metric system invented?

On his honeymoon, james joule attempted to explore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on mount blanc. what maximum temperature rise would one expect for a waterfall with a vertical drop of 20 m? the specific heat of water is 4186 j/kg ∙ k. a)0.064 c° b)0.053 c° c)0.071 c° d)0.047 c°