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FrozenT [24]
3 years ago
7

3. A block with a force of the Earth of -300. N is moved at constant velocity over a horizontal surface by a force of +50.0 N ap

plied parallel to the surface. What is the coefficient of kinetic friction?​
Physics
1 answer:
KIM [24]3 years ago
3 0

Answer:

-6

Explanation:

FRICTIONAL force=-300N,NORMAL REACTION,R=+50.0

Ú=F/R

=-300/+50.0

=-6

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Find the magnitude of a fourth force on the stone that will make the vector sum of the four forces zero.
Tanya [424]
100cos30° + 80cos120° + 40cos233° + Dx = 0 
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<span>y components: </span>
<span>100sin30° + 80sin120° + 40sin233° + Dy = 0 </span>
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<span>direction of D: </span>
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7 0
3 years ago
A lightbulb has a power of 100 W and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes. How much
ladessa [460]

Answer:

a. E=1440KJ

b. E=360KJ

c. E=1.8 J

Explanation:

I have the power (Watts) is expressed as Energy (Joules) / Time (seconds), also I have to1hour * \frac{60min}{1hour}*\frac{60s}{1min}\\1h=3600s

so, for the lightbulb

100W= \frac{Energy}{3600s*4}\\Energy=100W*14400s\\ E=1440000J =1440KJ

Analogously, for the microwave

1200W= \frac{Energy}{60s*5}\\Energy=1200W*300s\\ E=360000J =360KJ

Now, I have to express the efficiency as Heat energy / power * 100 so1.8= \frac{Heat Energy}{100W}*100\\Heat Energy=1.8J

Done

4 0
4 years ago
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