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Aleonysh [2.5K]
3 years ago
13

N instrument uses a battery that provides 500 J of energy for 1200 seconds. What is the power of the instrument?

Physics
1 answer:
Oxana [17]3 years ago
7 0

Answer: 0.42 watts

Explanation:

Given that:

power = ?

energy =500 joules

time = 1200 seconds

Recall that power is the rate of energy expended per unit time

i.e Power = energy / time

Power = 500J / 1200seconds

Power = 0.416 watts (rounded to the nearest hundredth as 0.42 watts)

Thus, the power of the instrument is 0.42 watts

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Components of Normal force

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Fny= 22700N

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Explanation:

Tension in the cable is calculated by:

Etorque= -FBcostheta(1/2L)+FT(3/4L)-FWcostheta(L)= I&=0 static equilibrium

FTorque(3/4L)= FBcostheta(1/2L)+ FWcostheta(L)

Ftorque=(Fcostheta(1/2L)+FWcosL)/(3/4L)

Ftorque= 2/3FBcostheta+ 4/3FWcostheta

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b) components of Normal force

Efx=FNx-FTcos(90-theta)=0 static equilibrium

Fnx=21900cos(90-55)=17900N

Fy=FNy+ FTsin(90-theta)-FB-FW=0

FNy= -FTsin(90-55)+FB+FW

FNy= -21900sin(35)+(1350+2250)×9.81=22700N

The Normal force

FN=sqrt(17900^2+22700^2)

FN= 28.900N

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