Explanation:
The junction rule says that the sum of the currents going into a junction must equal the sum of the currents leaving a junction. This describes the conservation of current.
Answer:
It takes 1 second to drop 26.4 meters, for acceleration due to gravity, the acceleration would double from the meters and would be 52.8 m/s^2.
Is there more information above question 4?
Explanation:
They probably put "rolls without slipping" in there to indicate that there is no loss in friction; or that the friction is constant throughout the movement of the disk. So it's more of a contingency part of the explanation of the problem.
(Remember how earlier on in Physics lessons, we see "ignore friction" written into problems; it just removes the "What about [ ]?" question for anyone who might ask.)
In this case, you can't ignore friction because the disk wouldn't roll without it.
As far as friction producing a torque... I would say that friction is a result of the torque in this case. And because the point of contact is, presumably, the ground, the friction is tangential to the disk. Meaning the friction is linear and has no angular component.
(You could probably argue that by Newton's 3rd Law there should be some opposing torque, but I think that's outside of the scope of this problem.)
Hopefully this helps clear up the misunderstanding for you.
Answer:
Potential energy turn to kinetic energy
Explanation:
Answer:
Part A: 43 m/s
part B: 40 m i don't know why it is 40 not 42
Explanation:
Part A
you have
range = 188m
since you have an angle which means parabolic graph like this
you will use the range special rule, which is equal to (v₀²sin(2θ))/g
188=v₀²sin(88)/(9.8)
you will find the answer
Part B
You will the formula Δy=v₀t-(1/2)(g)(t²)
such that v₀ is in y direction which means it will be 43sin(44) in this equation and the time can be got using the special formula t=v₀ in y direction /g
then you will plug the time in the quadratic equation
Finally after you get the answer you will subtract 3 from it, but you will find it 42 not 40 , which is the right answer
