Physics, 14.10.2019 20:00 stopithelpmeplease

Brenda and taylor push their car into the driveway because it will not start .the car ha a mass of 850 kg. they apply a force of 800 n for 30 seconds to move the car 15 m. (use correct units in all answers.)

a. how much work do they perform?

b. what is their power?

Answers: 2

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Answers

Answer from: quennnshyan7276

Explanation:

Given that,

Mass of the car, m = 850 kg

Force applied, F = 800 N

Time, t = 30 s

Distance covered, d = 15 m

To find,

(a) work done

(b) Power

Solution,

(a) Let W is the work done. The product of force and displacement is called work done. Its expression is given by :

$W=F\times d$

$W=800\ N\times 15\ m$

W = 12000 J

(b) The work done divided by time taken is called power of an object. It is given by :

$P=\dfrac{W}{t}$

$P=\dfrac{12000\ J}{30\ s}$

P = 400 W

Answer from: Quest

the answer to this question is 60 n

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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