Physics, 14.07.2019 16:00 dylalove4963

Amoving company is called into a building and asked to relocate 520 bricks to a location 15 meters above the ground if each brick is 4 kilograms what amount of work will be needed to accomplish the task

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Answer from: khan2491

Wow ! I'm sweating just thinking about it.

The amount of work required is the additional potential energy

that the bricks will have when they're all up at the higher location.

Increase of potential energy = (mass) x (gravity) x (increase in height)

The total mass is (520 bricks) x (4 kg/brick) = 2,080 kilograms

Potential energy = (2,080 kg) x (9.8 m/s²) x (15 m)

Potential energy = 305,760 Joules.

Grab your hat, put on your sunscreen, and get busy.

Answer from: Quest

One splits the atoms and molecules the other combines them

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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