A net force of 66 newtons accelerates a child at 2.0 m/s? down a smooth playground slide. What is the mass of the child?

A 130 kg
B68 kg
© 64 kg
D 33 kg

Which other elements contain the same number of outer electrons as sodium

Acontrol during an experiment. might change remains constant does not exist does change

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.