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A boy is cycling such that the wheel of the cycle are making 420 revolutions per minute. If the diameter of the wheel is 50 cm, find the speed of the boy.
Read Solution (Total 7)
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- Diameter = 50 cm then radius(r) = 50/2 cm
AS answer is given in (km) we have to convert (cm) in (km).
Now r= 50/2= 25 cm then (25/100) in meter then (25/100*1000) in km
Circumference of cycle = 2*22/7*r
Number of revolutions per minute = 420
we have to multiply 60 with circumference becoz it will be converted into hour as answer is given in hour only.
speed = 2*(22/7)*[25/(100*1000)]*60*420 km/hr
= 396/10 km/hr
= 39.6 km/hr - 11 years agoHelpfull: Yes(43) No(3)
- since circumference =3.14*d(diameter)
in one revolution distance covered is=3.14*.50(meter)
so,in 420 revolution =(.50*3.14*420*60(for hour convertion))/1000(km)=39.564km/hr
- 11 years agoHelpfull: Yes(22) No(2)
- Diameter = 50 cm then radius (r) = 50/2 cm
Circumference of cycle = 2*22/7*r= 2*22/7*50/2
in one revolution distance covered is=cirucumference=22/7*.50(meter)
420 revolutions= 22/7*.50(meter) *420;
for 1 min 420 revolutions, for 1 hr = 3.14*.50(meter) *420 *60 m/hr
converting into km= (3.14*.50(meter) *420 *60)/1000 km/hr = 39.564km/hr - 11 years agoHelpfull: Yes(7) No(0)
- since circumference =3.14*d
in one revolution distance covered is=3.14*.50
so,in 420 revolution =(.50*3.14*420*60(for hour convertion))/1000(km)=39.564km/hr - 11 years agoHelpfull: Yes(4) No(1)
- 1 minute-420 revolution
60minute- 420*60 revolutoions
now, in one revolution the wheel goes 0.5 m..
420*60 revolution - 0.5*420*60 = 12600 m..
so speed is -12.6 kmph - 11 years agoHelpfull: Yes(1) No(17)
- 39.56 km/hr.. distance travelled is equal to the circumference of the wheel multiplied by the no of revolutions
- 11 years agoHelpfull: Yes(1) No(1)
- Diameter = 50 cm then radius(r) = 50/2 cm
As answer is given in (km) we have to convert (cm) in (km).
Now r = 50/2 = 25 cm then (25/100) in meter then (25 / 100*1000) in km
Circumference of cycle = 2*22/7*r
Number of revolutions per minute = 420
We have to multiply 60 with circumference because it will be converted into hour as answer is given
in hour only.
Speed = 2*(22/7)*[25/(100*1000)]*60*420 km/hr
= 396/10 km/hr
= 39.6 km/hr - 8 years agoHelpfull: Yes(1) No(0)
TCS Other Question
1.There is a circle with 2 triangles inscribed in it. in opposite direction making a star. The triangle is equilateral of side 12. u have to tell the area of the remaining portion of the circle. ans
In a State "X", the ratio of males, females and children above 10 years is 11 : 10 : 9. The percentage literacy in males is 50% which equals 5500. 20% of the children are illiterate and 30% females are literate. The number of children below 10 years of age is 10% of the number of females. 5% of the total population is below the poverty line and out of these, 80% are illiterates.
1. How many people are below poverty line and are illiterate?
(a) 7200
(b) 840
(c) 3000
(d) 1,000
(e) 900
2. What is the total population of the State "X"
(a) 21,000
(b) 20,000
(c) 10,000
(d) 1,000
(e) 840
3. How many children above 10 years are literates?
(a) 11,000
(b) 9,000
(c) 7,200
(d) 1,000
(e) 7,000
4. What is the percentage of women? (approximate)
(a) 50
(b) 45
(c) 55
(d) 52
(e) 48
5. How many men are illiterate?
(a) 2250
(b) 2500
(c) 3500
(d) Data inadequate
(e) None of these