Physics, 27.11.2019 21:31 cringygaming12

Calculate (4.2 ∙ 105) cm ∙ (4.0 ∙ 10-9) cm2.
!
1.7 -3
2 14
1.68

Answers: 3

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Answers

I believe the givens should be written in this manner,
(4.2 x 10⁵)(4.0 x 10⁻⁹)
To answer, we first multiply the bases 4.2 and 4 which will give us,
16.8
Then, we multiply the multipliers by adding up the exponents of 10. This will give us the answer of,
16.8 x 10⁻⁴
Then, the final answer would be 1.68 x 10⁻³.

Answer from: Quest

f=ma newton

f=100x2.5=250n

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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Calculate (4.2 ∙ 105) cm ∙ (4.0 ∙ 10-9) cm2.
!
1.7 -3
2 14
1.68...

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