Physics, 26.09.2019 20:30 bvolleyball9

Find the force, in n that does 0.0284 kilojoules of work in moving a book a distance of 4.00 meters

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Answer from: tmark45

Work equals force times distance. When you move an object, you are exerting a force onto it. By exerting a force on the object, you are actually displacing it from its initial position. You cannot apply force to the object without altering its position. Keep in mind that when you exert work, you are exerting energy too. Note that 1 kilojoule = 1000 joules and joules is equal to Newton meter. So,

W = F*d
F = W/d
F = (0.0284 kJ)(1000J/1kJ)(1N-m/1J)/4m
F = 7.1 N

Answer from: Quest

3.2x10^7

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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Find the force, in n that does 0.0284 kilojoules of work in moving a book a distance of 4.00 meters...

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