Answer:
i would like to help you but I can't help you i don't understand the question and i don't speak Spanish
No work was done. Work is calculated by force/distance. If there isn't a distance change, no work has technically been done. I'm pretty sure that's right, at least! Hope it helps.
The correct answer is C) towards the center of the circle.
Although the object is moving at a constant speed it is constantly accelerating due to the constant change in direction as it describes the circular path. This causes a constant change in velocity as velocity is a vector quantity.
For the object to maintain the circular path there has to be centripetal force acting on the object and this centripetal force is directed towards the center of the circle.
The change in momentum of a 3kg object is 12
The current through a resistor is
<u> (voltage across the resistor) / (resistance of the resistor)</u> .
If the numerator and the denominator of that fraction are both
multiplied or divided by the same number, then the value of the
fraction <em>doesn't change</em>.