A train moves in north direction with a speed of 54 km/hr. and a monkey running on the roof of the train, against its motion with a velocity of 18km/h

Monjur Alahi

A train moves in north direction with a speed of 54 km/hr. and a monkey running on the roof of the train, against its motion with a velocity of 18km/hr. with respect to the train, then the velocity of monkey as observed by a man standing on the ground:-
A. `5 ms^(-1)` due south
B. `25 ms^(-1)` due south
C. `10 ms^(-1)` due south
D. `10 ms^(-1)` due north


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Correct Answer - D
`vecV_(TG)=54xx(5)/(18)=15m//s=15hatj`
`vecV_(MT)=-18xx(5)/(18)=-5m//s=-5hatj`
`vecV_(MT)=vecV_(MG-vecV_(TG)`
`vecV_(MG)=vecV_(MT)+vecV_(TG)=-5hatj+15hatj`
`=10hatj=10m//s` along north

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
A toy train crosses 210m and 122m long tunnels in 25 and 17 seconds respectively with the same speed. The length of the train is ……

Correct option is (B) 65 m Let the length of the toy train be x m. Given that length of tunnel I is 210 m and length of tunnel II is 122 m Since,...

2 Answers 2 views
A toy train crosses 210m and 122m long tunnels in 25 and 17 seconds respectively with the same speed. The length of the train is …… 2 Answers 1 views
A 10 m wire kept in east-west direction is falling with velocity 5 m/s perpendicular to the field `0.3xx10^(4)Wb//m^(2)` due north and horizontal. The

Correct Answer - B Induced emf = Blv =`0.3xx10^(-4)xx10xx5` `=1.5xx10^(-3)V=1.5mV`

2 Answers 1 views
A monkey of mass 40 kg climbs on a rope which can withstand a maximum tesion of 600 N In which of the following cases will the rope break ? The monkey

(a) `T-40g=240 rArr T=632N` (b) `392-T=160 rArr=232N` (c) T=392N The rope will break in case (a) as `Tg600N`.

2 Answers 1 views
A body has to travel 120km distance. It travels first 30km with uniform speed 30km/hr. Its average speed is 60 km/hr. What should be its speed in next

Average speed `=("total distance")/("total time")rArr60=(120)/(t)rArrt=2hr` time taken to cover first 30km `=(30)/(30)=1hr` time taken to cover next 90km =1hr So that speed in this duration `=(90)/(1)`=90 km/hr

2 Answers 1 views
A 210 meter long train is moving due north at a of 25 m/s. a small bird is flying due south a little above the train with speed 5 m/s. The time taken

Correct Answer - B Relative velocity of the bird `=25-(-5)` `=30 m//s` Distance =210m `therefore=("Distance")/("velocity")=(210)/(30)=7` sec

2 Answers 1 views
A particle is moing with a velocity of `10m//s` towards east. After 10s its velocity changes to `10m//s` towards north. Its average acceleration is:-

Correct Answer - B Acceleration `veca=(Deltavecv)/(Deltat)=(10hatj-10hati)/(10)` `=-hati+hatj` (west north) `|veca|=sqrt(1+1)=sqrt(2)` (north-west)

2 Answers 1 views
Particle running with constant speed v in circle of radius R then answer the following question. During running on circumference if particle made angl

Correct Answer - B `|vec(v)_(2)|-|vec(v)_(1)|=0`

2 Answers 1 views
Particle running with constant speed v in circle of radius R then answer the following question. During running on circumferences if particle made ang

Correct Answer - A `|vec(v)_(2)-vec(v)_(1)|=2vsin.(theta)/(2)`

2 Answers 1 views
Replication of DNA occurs (A) 3’ → 5’ direction (B) 5’ → 3’ direction (C) Both 3’ → 5’ and 5’ → 3’ direction (D) None of these

Correct option is: (B) 5’ → 3’ direction

2 Answers 1 views
X