Answer:
a) the acceleration of the block is 8.8 m/s^2
b) the time is 0.33 s
Explanation:
The first that we shall do is to draw the free body diagram, like the one that appears in the attached image. Let's see that the axis x and y were rotated for a better understanding of the equations developed.
We know that the movement with acceleration is the x-axis therefore the total amount of forces will be equal to the product of the mass and the acceleration.
The following step is to calculate the normal force, using the total forces in the y-axis that it is equal to 0. (because there is no movement in the y-axis).
By the definition of the friction force = normal force * friction coefficient. We can calculate the friction force and use it in the equation 1.
For the calculation of the time, we use the kinematics formulas.
Have in count that the body starts moving from the rest therefore v0 = 0
The second condition necessary to achieve equilibrium involves avoiding accelerated rotation (maintaining a constant angular velocity. A rotating body or system can be in equilibrium if its rate of rotation is constant and remains unchanged by the forces acting on it.
Answer:
SANTUR OR ARNUTS
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Answer:
Una secadora de cabello tiene una resistencia de 10Ω al circular una corriente de 6 Amperes, si está conectado a una diferencia de potencial de 120 V, durante 18 minutos ¿Qué cantidad de calor produce?, expresado en calorías
Answer:
2805 °C
Explanation:
If the gas in the tank behaves as ideal gas at the start and end of the process. We can use the following equation:
The key issue is identify the quantities (P,T, V, n) in the initial and final state, particularly the quantities that change.
In the initial situation the gas have an initial volume
, temperature
, and pressure
,.
And in the final situation the gas have different volume
and temeperature
, the same pressure
,, and the same number of moles
,.
We can write the gas ideal equation for each state:
and
, as the pressure are equals in both states we can write
solving for
(*)
We know
= 935 °C, and that the
(the complete volume of the tank) is the initial volume
plus the part initially without gas which has a volume twice the size of the initial volume (read in the statement: the other side has a volume twice the size of the part containing the gas). So the final volume ![V_{f}= V_{i} + 2V_{i}=3V_{i}](https://tex.z-dn.net/?f=V_%7Bf%7D%3D%20V_%7Bi%7D%20%2B%202V_%7Bi%7D%3D3V_%7Bi%7D)
Replacing in (*)