A man drives his car uniformly at 30 km/h for three hour After it he covered next 90 km distance with uniform speed of 45 km/hr. Find the average speed of car.
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Find the ratio of magnetic dipole moment and magnetic field at the centre of a disc. Radius of disc is `R` and it is rotating at constant angular spee
Correct Answer - `[(piR^(3))/(2mu_(0))]`
2 Answers 1 views
A car moving at a speed 10 m/s on a straight road is ahead of car B moving in the same direction at 6 m/s. Find the velocity of A relative
Given: vA = 10 m/s, vB = 6 m/s, To find: (i) Velocity of A relative to B (vA – vB) (ii) Velocity of B relative to A (vB – vA) Formulae: (i) vAB = vA – vB (ii) vBA =...
2 Answers 1 views
A racing car completes 5 rounds of a circular track in 2 minutes. Find the radius of the track if the car has uniform centripetal
Given: 5 rounds = 2πr(5), t = 2minutes = 120s To find: Radius (r) Formula: acp = ω2r Calculation: From formula, acp = ω2r ∴ π2 = \(\frac{V^2}{r}\) But v = \(\frac{2\pi r(5)}{t}=\frac{10\pi r}{t}\) ∴ π2 = \(\frac{100 \pi^2 r^2}{rt^2}\) ∴ r = \(\frac{120\times120}{100}\) =144m The radius of...
2 Answers 1 views
A man travels two-third part of his total distance with speed `v_(1)` and rest one-third part with speed `v_(2)`. Find out the average speed of the ma
Correct Answer - `(3v_(1)v_(2))/(v_(2)+2v_(1))
2 Answers 1 views
A body moving with uniform acceleration covers a distance of 14 m in first 2 second and 88 m in next 4 second. How much distance is travelled by it in
Correct Answer - 5m
2 Answers 8 views
A car starts from rest and moves with uniform acceleration for time t then it moves with uniform speed of 60 km/h for time 3t and comes to rest. Find
Correct Answer - 50 km/h
2 Answers 2 views
A car is moving towards east with a speed of `25 km h^-1`. To the driver of the car, a bus appears to move towards north with a speed of `25 sqrt(3) k
Correct Answer - 50 km/h`(60^(@)N" of "E)`
2 Answers 1 views
A man observes a car from the top of a tower, which is moving towards the tower with a uniform speed. If the angle of depression of the car change fro
Correct Answer - `473.2 m`
2 Answers 1 views
A body falling for 2 sec. covers a distance ‘s’ equals to that covered in next second. If g = 10 m/s^2 , s =
Correct option is A) 30 m
2 Answers 2 views
A car covers half the distance at a speed of 60 kmh^(-1) and the other half at a speed of 40 km h^(-1) The average speed of the car is
Correct option is B) 50 km h-1
2 Answers 1 views