Answer:
Explanation:
Given
mass of chair m=21 kg
Force required to set chair in motion is 175 N
Once the chair is in motion 137 N is require to move it with constant velocity
i.e. 175 N is the amount of force needed to just overcome static friction and 137 is the kinetic friction force
thus

where
is the coefficient of static friction and N is Normal reaction





just analyze it in this way:
20cos30*=10( radical 3 )
20sin30*=10
Relative dating<span> and absolute </span>dating<span> are used to determine age of fossils and geologic features, but with </span>different<span> methods. </span>Relative dating<span> uses observation of location within rock layers, while absolute </span>dating<span> uses data from the decay of radioactive substances within an object.</span>
The answer is false. the amount of protons is the same amount as the mass.