A rocket fires two engines simultaneously. One produces a thrust of 725Ndirectly forward while the other gives a 513N thrust at
1 answer:
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Answer:
Explanation:
We have to many data in different system, so we need transform everything to SI, that is
When we have all this values in SI apply a Energy Balance Equation,
Solving for V_2
From the table of gas properties we calculate for and
For T_2;
Substituting in equation for V_2
Answer:
<em>Answer: - , + </em>
Explanation:
<u>Velocity and Acceleration </u>
In general terms, velocity and acceleration in the plane are both vectors with two components. They don't have 'sign' but magnitude and direction. If we know motion is restricted to a simple line, then we can define the positive and negative references.
In vertical motion, the positive reference is commonly pointed upwards, but if we chose the opposite way, the results shouldn't change in magnitude, just their signs. Let's choose like proposed, the positive direction upwards.
Since the elevator was moving downwards, its velocity is negative. When the button is pushed, it continues to move downwards, but slower. Its velocity is still negative.
The acceleration has the same sign as the velocity if it tends to increase the magnitude of the object, and is negative in the opposite case. Let's look at the formula
In this case, because the elevator will eventually stop, and
is negative. It means the acceleration is
It results in a positive value
Note: If we chose the opposite references, then the answer would be: +,-