Physics, 29.07.2019 00:30 daniecott

Which of the following will not be a good fuse design ? a; low-melt wire encased in glass . b; low-melt wire encased in ceramic. c; low-melt wire encased in iron . d- low-melt wire encased in a tube of air

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Low-melt wire encased in iron doesn't sound like a good idea.
I can think of two things wrong with it:

1). A fuse is designed to melt if the wire gets too hot.
If the wire is mounted in iron, the heat from the wire will
just soak away into the iron, and the fuse-wire will never
get hot. So this fuse would not do its job and protect you
or your circuit.

2). Iron is a pretty good conductor of electricity too.
So if the fuse wire is mounted in iron, then touching the
iron is almost the same thing as touching the fuse-wire.
This design would be very dangerous, and you'd have to
encase the iron in something ELSE ... like maybe glass
or ceramic ... to prevent people from touching the iron.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

the ima (higher than 1m) will be greater than the ima with the height of 1m.

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Which of the following will not be a good fuse design ? a; low-melt wire encased in glass . b; lo...

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