Answer:
An attraction between two objects that have mass :)
Objects sink if they are denser than water
Answer:
a) λ = 2 m
, c) f = 50 Hz
Explanation:
When a string is fixed at the ends the wave is reflected at each end, giving rise to a standing wave.
Since we extract them are fixed we have nodes at these points, the wavelength in the string is
fundamental λ = 2L
2nd harmonic λ= 2L / 2
3 harmonica λ= 2L / 3
a and b) from aui we can find the wavelength
λ = 2 3/3
λ = 2 m
c) the speed of the wave is related to the frequency and wavelength
v = λ f
f = v / λ
f = 100/2
f = 50 Hz
d) the acceleration can be found with the equations
a = d²y / dt²
the standing wave equation is
y = 2A sin kx cos wt
a = -2A w² sin kx cos wt
the acceleration is maximum when the cosine is ±1
A = 2A w² sin kx
the oscillatory part indicates that the wave moves, if we make this maximum vine, they relate it to
a = 2A w²
w = 2πf
A = 0.2 cm = 0.002 m
a = 2 0.002 (2π 50)²
a = 98.7 m / s
The car travels a distance of
(8.0 m/s) (5 s) + 1/2 (10.0 m/s²) (5 s)² = 165 m
Well I'll tell ya. I've had a piece of paper that says I'm an electrical engineer
for 43 years now, and I've done a lot of stuff with volts and amps during that
time. But you just threw something at me that I don't recognize. I don't know
what it means when somebody says that a circuit is 'valid' or not valid.
I'm taking your points, so I'll give you an off-the-cuff, back-of-the-cocktail-
napkin answer, straight from the seat-of-my-pants department:
The circuit you described has voltage sources and they're connected
in series. So far, so good. You have current in the circuit, so you know
that the circuit is 'closed' (continuous). The current is reasonable (5A,
so you know that the circuit is most likely not 'shorted'.
We can't say anything about the net effective resistance in the circuit,
because we don't know the net effective voltage. IF all the sources are
connected up with their pluses and minuses all facing the same direction,
then the total voltage is 100 volts. But it's possible that one of them is
connected in the opposite direction ... like if you put one battery in your
flashlight upside-down. If that happens, then the voltage of that source
adds to the voltage of the other two sources as if it's a negative voltage,
and the sum of the three sources will be less than 100V.
As long as each source is capable of delivering 5 A ... possibly negative ...
then your circuit sounds perfectly "valid". The description is pretty sketchy,
but there's nothing in it that won't work.
If there's a new definition of circuits out there that I haven't heard yet,
then this is a pretty useless answer, and I apologize.
