94 centimeters would be 940,000 micrometers
(3 x 10⁸ meter/sec) x (100 cm/meter) x (3.2 x 10⁷ sec/year)
= (3 x 10⁸ x 100 x 3.2 x 10⁷) (meter-cm-sec) / (sec-meter-yr)
= <span>( 9.6 x 10¹⁷ ) ( cm/yr )</span>
If you write down the formula for friction, you will get an answer.
Ff = u * N Where N is a push down force that an object experiences.
u (mu) is a constant and has no units
It may not be accelerating and still experience friction. A is not correct.
Color and Density will not affect the frictional force. B is not so.
Buoyant forces are a different thing altogether. Generally friction has nothing to do with them. C is incorrect.
The last one is your answer. Technically mg should be the answer and not mass, but the second part is correct.
The first choice is the true statement.