Physics help about POWER?

Question

a free response question i don't understand

How much power is developed by a motor that moves 45kg load a distance of 200m in 1.5min?

I got stuck on how to do that question, please help me

thanks in advance

the problem is that i don't know how to find the force of the object

Answer 1

take g = 9.8 m/s^2 and let us assume the load is being lifted vertically upwards. This should have been mentioned in the question or the force against which it is being moved should have been mentioned. In the absence of that we make these simplifying assumptions.

The motor does 45x9.8x200 joules of work in 90 seconds so the power with which the machine works is

(45x9.8x200)/90 = 980 J/s or 980 watt

Answer 2

In physics, power (symbol: P) is the rate at which work is performed. In the SI system of measurement, power is measured in watts (symbol: W). This can be modeled as an energy flow, equivalent to the rate of change of the energy in a system, or the time rate of doing work,

Power={dW}/{dt}
W=work
t=time
d=change in

We also know that
Work = F * {ds}

And finally:
F=ma
m=45kg
a = 9.81 m/s^2

Thus using these two formulas we can obtain the following:
Work = F * {ds}
Work = 45kg * 9.8m/s^2 * 200m
Work = 88200kgm^2/s^2

Finally Power
P = W/t
P = 88200kgm^2/s^2 / 1.5s
P = 58800 kg * m^2 /s

Answer 3

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Answer 4

Power=work / time
work=force * distance
hope this helps

Answer 5

newtons= kg M/s

thats the formula, do it yourself

just plug in the numbers