### Particles of mass 10^-2kg is fixed to the tip of a fan blade which rotates...

Particles of mass 10^-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is

• A. 2 N
• B. 20 N
• C. 200 N
• D. 400 N
##### Explanation

F = $$\frac{mv ^2}{r}$$

= $$mω^2r$$

(Since V = ωr)

F = 10$$^{-2}$$ x 100$$^2$$ x 0.2

F =20 N

#### Contributions (123)

F=?,V=100,R=0.2, M=0.01

since F=MWV making W d sof since is not given

W=V/R substituting it in the equation abve

F=Mv²/R inserting the values

F=0.01×10000/0.2

F=100/0.2

F=1000/2

F=500

no answer check this pals
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• Favour: Hw do u get d 0.01
1 year ago
• Jamzy: 10^2 is 0.01
1 year ago
• Ayo: No its 0.1
1 year ago
• namzy: 0.1
1 year ago
• Olanrewaju Abiola: 10^2 = 0.01.
We found it by 1/10^2 = 1/100 and is 0.01.
7 months ago
• elufisoye: the answer is 20n
the reason is because f=mv^2/r
f= unkown
m= mass which is 10^-2
v^2= 100^2
r= 0.2
then calculate wisely you get your 20n
5 months ago
• Victor: F= mv^2/r.....1
then w= v/r
make v the s.o.f v= wr.....2
substitute 1 by 2
since v has the power of 2 it will be v^2 = w^2r^2
F = Mw^2r^2/ r
then r at the denominator will cancel one 1r at the numerator remaining 1r
therefore
F=Mw^2r
Now substitute your values
remember 10^-2 = 0.01
F = 0.01 * 100^2 * 0.2
F = 0.01 * 10000 * 0.2
F = 20N
4 months ago
• lawal ihima musa: M=0.01,
w=100,
f=?
R=0.2

remember V=RW
:.V=0.2*100=20
then
Ft=mv^2/r
F=0.01*20^2/0.2
F=4/0.2
F=20N
4 months ago
D ans is 'c' bcos m=10^-2 w=100rad^-1 r=0.1m using f=mv^2/r

Recall dat v=wr . V=100＊0.2 den v=20N put 'v' into f=mv^2/r f=0.1*400/0.2

F=200N

NB dat 10^-2 =0.1 nd nt 0.01
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• thomassunday24@gmail.com: ur working is wrong pls chek again
6 years ago
• sirosmosis: 1/100x10000x0.2=20N take note... i was confuse just like u.... 10^-2 = 1/100 note... w=0/t
5 years ago
• Destlaw: kutuku u are wrong
4 years ago
• awe fezighe daniel: Guy you tried but you forgot just one step. look f=m(vsquare )/r but we don't know the value of v so we recall that v=wr =100×0•2=20m/s. substituting v into f=M(Vsquare)/r we have since m=10^-2=0•01kg r=0•2m f=0.01×20×20/0•2 =4/0•2 =20N answer. please take note of your steps. Bless you!
4 years ago
• Petros1: ✔problem solved
3 years ago
• Motu Science: Fezighe your workings are simple and correct,thanks
2 years ago
• Franklin: kutuku.
u got it wrong by using fractional method to interpret 10^-2 instead of using the knowledge of binary operation. which will give you. 0.01.
9 months ago
given that m(v*v)/r
m:10 kg~0.01
v:100 rad
r:0.2m
0.01*100*100/0.2=500N
As my own answer
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@kutuku...10^-2 cant b 0.1,buh itz 0.01
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• Destlaw: @enkaay are u sure ...???
4 years ago
which formular is this guys???
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• Ehiaghe: centripetal force
4 months ago
20N is d answer
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Since v=wr
F=m(wr)^2/r
F=mw^2r
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Following the equation below>F=MV^2/R.where f is centripental force,m is mass of body,v is linear velocity.V=wr.now let substitute v for wr in the initial equation>F=mw^2r^2/r now this then gives f=mw^2r.wow!Now lets input our values.f=1/100*10000*0.2=20N. Pls i can't shout.
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• Innocent2020: ur workins ar great
6 years ago
• blessing.ikojo@gmail.com: Lawal, pls am confused.
6 years ago
• Milomichael: Lawal....u r funni...u tink ts waec?
6 years ago
• seribroo_56: mr lawal u are scremin it is 200 & not 20
6 years ago
• Frank Gilbert: Pls whc formular did u use d name
6 years ago
• Audreylivvy: It's supposed 2 b 200
5 years ago
• sansaliuhassanadebola: wuru wuru 2 d ans @ lawal
5 years ago
• ladygsp: i dnt understand,pls can u use another method in solving it
4 years ago
• Debbie Dibie: olanrewaju assumption is the greatest killer in science.I'll advise you take a iook at it again.
4 years ago
• Forwardtutor: F=Ma since a=w^2r (centripetal acceleration) a=100^2*0.2

A=10000*0.2 a=2000m/s^2

F=0.01*2000 F=20N
4 years ago
• sharlon: how do u get 0.01 am confuse
4 years ago
• viincee: 10^-2 is not 0.01 rather it is 0.1
3 years ago
• spunky great: 10^-2=0.01
3 years ago
• Josephoctober: Haba Lawal, you have just done a beautiful zero by displaying the mad man in you called PRIDE,and you don't even got it it right by your rough work, your answer is 200N always take your time when it comes to calcutions not only physics but other courses and you are here to share your opinion on the answer not show your muscles, please, take your time.
3 years ago
• knvq smith tee: d answer is 500 check well.
1 year ago
See, the whole confusion here is in converting 10^-2, nd I think it is 0.10, not 0.01. That's what varies the answer; if u use 0.01 u get 20N; if it's 0.10 u get 200N. It should be 200N.
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• Olanrewaju Abiola: 10^2 = 0.01 because taking the decimal forward to form 10 will be twice.
F=mv^2/r..... V=wr, w=100, then v=100x0.2=20. m=0.01, r=0.2
F=0.01x400/0.2 =20N.
7 months ago
I'll go for B dose saying C shud rethink and resolve. Tanx
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F=mv^2÷r
F=10^-2×100^2÷0.2
F=100÷0.2
F=500N
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• Daniel Bayero: V is not given so u need to derive ur formular to use W
4 months ago
v is not given so we get to find it by using:v=rw,then we can now bring our centripetal force formular,f=mv^2/r,0.01*20^2/0.2,it gives 20N.
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GUYS ...REMEMBER DAT 10#-2(D # MEANS EXPONENTIAL). IS D SAME AS 1*10#-2 MEANING 0.01
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d kret and is 20n bcos mw^2r=10^-2*100^2*0.2=20.
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guys please explain better am confused
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• awe fezighe daniel: f=M(Vsquare )/r but we don't know the value of v so we recall that v =wr from angular velocity formula. then our v = 100×0•2=20m/s. we then substitute the value of v into f=M(Vsquare )/r =0•01×20×20/0•2 =4/0•2= 20N remember that our m=0•01, r=0•2 and Vsquare =20×20=400
4 years ago

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