Given the velocity-time graph of an object.
The slope of a velocity-time graph gives the acceleration acting on the object.
From the graph, we can see that the slope of the graph is zero. That is, the velocity of the object is constant and hence the net acceleration acting on the object is zero.
From Newton's second law, the net force acting on an object is given by the product of the mass of the object and its velocity. Therefore when the acceleration of the object is zero, the net force on the object is also zero.
Therefore the net force acting on the given object is zero. Hence, the correct answer is option A.
90.9 is the velocity of an airplane
Electrostatic (it’s a combined word) that’s all what i know honestly, hope it helps:)
Answer:
Explanation:
1) Make sure the service portion of the structure stays above the highest probable water level.
2) Make sure the support structure in contact with the water can withstand the tidal flows
3) Consider whether the added restriction of the proposed structure will altar the height of, or water velocity contained in, the tidal exchanges.
4) Consider whether a dock needs to have mechanisms to compensate for large sea level changes.
Answer : The value of 
is 4.76 J
Explanation :
Formula used :
According to the ideal gas equation,
So,
where,
= internal energy of the reaction = -358 J
= enthalpy of the reaction = ?
= initial pressure = 0.36 atm
= final pressure = 0.34 atm
= initial volume = 8 L
= final volume = 19 L
Now put all the given values in the above formula, we get:
conversion used : 
Therefore, the value of is 4.76 J
