Answer:
true I, II and III
Explanation:
The force is a vector quantity, by local it must be added as vectors, we can suppose several cases
.i) the vectors are colonial, so their sum is maximum
F_max = 9 + 15 + 18
F_max = 42 N
This is the maximum value
ii) the anti-parallel vectors giving a minimum value
F_min = 15 + 9-18
F_min = 6 N
iii) the vectors have angles between them, so we must use the Pythagorean theorem to find the resultant, which is an intermediate value between the two extreme values found.
Let's take a look at each statement
I) True This is the maximum value of the force if all the vectors are colonial
II) True The minimum value is 6 N, so zero can never be reached
III) True these bores are between the maximum values and the direction of the vectors, lower values occur when the forces have angular between them
IV) False. Force can never reach zero
V) False. Several of the above are conclusions of the exercise
Answer:
160.75 N
Explanation:
The downward velocity has no effect on the force situation, it is only changes in velocity (plus, of course, gravity, which is always there) that require a force. At constant velocity, the bottom spring s_3 is supporting its mass m_3 to balance gravity.
As the elevator slows, though, it also ends up slowing down the spring arrangement, too. However, because the stretching takes time, it means that some damped harmonic motion will be set up in the spring chain.
When the motion has finally damped out, the net force the bottom spring s3 exerts on m3 has two components--that of gravity and of the deceleration of the elevator:
F_3net = m3 * (g + a) = 10.5×(9.81+5.5)= 10.5×15.31= 160.75 N
Answer:
sorry I am not getting dear friend
<span>The correct
answer between all the choices given is the first choice or letter A, which is 0.45J. I am
hoping that this answer has satisfied your query and it will be able to help
you in your endeavor, and if you would like, feel free to ask another question.</span>
