3 years ago

Which pf these measurements has 3 significant digits?

Physics

1 answer:

borishaifa [10]3 years ago

6 0

What measures we can't answer without the measures

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Heat gained or lost is mass times specific heat times change in temperature.

BlackZzzverrR [31]

the answer would be B

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3 years ago

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Anna applies a force of 19.5 newtons to push a book placed on a table. If the normal force of the book is 51.7 newtons, what is

andrey2020 [161]

Considering that the book is moving with constant speed, the force applied by Anna must be the same that the friction force:

$F = F_R = F\cdot \mu_k\cdot N$

If we clear the previous equation:

$\mu_k = \frac{F}{F_R} = \frac{19.5\ N}{51.7\ N} = \bf 0.38$