Need helppp number 5
2 answers:
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Answer:
50%
Explanation:
For the particular case we assume that the centripetal force is equal to the frictional force. Starting from this, we realize that while the car takes a curve, which allows it to not leave the track, it is the friction force that adheres it to the floor, in this way,
The values of these equations are given by,
Equating the terms
Both gravity and radius are values that during the trajectory with constants, so
The difference comes in winter and dry, so,
\mu_{dry} = \mu
as in winter it is a quarter, you have to,
\mu_{winter} = \frac{1}{4} \mu_{dry} = \frac{1}{4} \mu
Performing the proportion we have to
We can conclude that the new value for this speed is 50% of its value on a dry day.
Answer:
The coefficient of kinetic friction between the block and the surface is 0.127.
Explanation:
Given that,
The mass of a block, m = 4 kg
The acceleration of the block, a = -1.25 m/s²
We need to find the coefficient of kinetic friction between the block and the surface. The force of friction is given by :
So, the coefficient of kinetic friction between the block and the surface is 0.127.