Physics, 26.09.2019 20:30 juanitarodrigue

Ablock of aluminum with a mass of 1 kg is placed in a beaker of water filled to the brim. water overflows. the same is done in another beaker with a 1-kg block of lead. does the lead displace more, less, or the same amount of water?

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Answer from: jimennacastillo15

Aluminium displaces more water

Explanation:

Given

mass of aluminium block=1 kg

mass of lead block= 1 kg

Also we know density of lead =11.34 gm/cm^3

Density of Aluminium =2.70 gm/cm^3

As the density of lead is more than that of Aluminium therefore its volume is lesser than Aluminium for same mass.

Thus aluminium displaces more amount of water as compared to lead.

Answer from: Quest

a and b sometimes have a positive value

For which optical devices does d sometimes have a positive value

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.

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Ablock of aluminum with a mass of 1 kg is placed in a beaker of water filled to the brim. water over...

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