Answer:
v = 9 m/s
Explanation:
It is given that,
Initial speed of the sailboat, u = 3 m/s
Acceleration of the sailboat,
Initial speed of the motorboat, u = 0
Acceleration of the motorboat,
Time elapsed, t = 3 s
To find,
The velocity of the sailboat
Solve,
Let v is the velocity of the sailboat after 3 seconds. By using the equation of kinematics, it can be calculated.
v = 9 m/s
Therefore, the velocity of the sailboat is 9 m/s.
To solve this exercise it is necessary to take into account the concepts related to thermal expansion.
The thermal expansion is given by the function,
Where,
Change in Length
Change in Temperature
Coeficiente de dilatación lineal
Initial Length
By quickly deducing the formula, we can realize that the greater the change in temperature, the greater the change in the length of the radius.
The change in length is proportional to the change in temperature. Considering that the other two terms are constant we have that the correct one would be: <em>The hole in the center of the washer will expand.</em>