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

Monjur Alahi

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 by the bird to cross the train is
A. 6s
B. 7s
C. 9s
D. 10s


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

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

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
flying bird is an example of

Correct Answer - b flying bird gives up energy and takes in air `(O_(2)`.

2 Answers 1 views
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

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

2 Answers 1 views
An aeroplane moving horizontally with a speed of 180km/hr. drops a food packet while flying at a height of 490m. The horizontal range of the packet is

Correct Answer - C `x=txxu=sqrt((2h)/(g))xxu=sqrt((2xx490)/(9.8))xx50=500m`

2 Answers 1 views
A particle is moving on path whose trajectory equation is `y=A sin (Bx)` where A=4 meter and `B=(pi)/(6)` rad/meter. Find displacement while the parti

`d=sqrt(u^(2)+3^(2))=5m`

2 Answers 1 views
(Modern Small Scale Industries, Challenges before Small Scale Industries, Traditional Small Scale Industries, Importance of Small Scale Industries)

Group A Group B (1) Hand loom, Handicraft, Coir, Sericulture Traditional Small Scale Industries (2) Modern Small Scale Industries Bicycles parts, sewing machines, Blades, Razor, Electric Appliances, Spare parts (3) Job opportunities, Regional balance, Reduce migration, Maximum...

2 Answers 1 views
If a pole 6 meter high casts a shadow 2√3 meter long on ground, then the angle of elevation of sun is –

Correct answer is (D) 60°

2 Answers 2 views
An iron rod 0.2 m long, 10 mm in diameter and of permeability 1000 is placed inside a long soleniod wound with 300 turns per meter. If a current of 0.

Correct Answer - `0.2325 Am^(-1)`

2 Answers 13 views
The energy of alpha particles emitted by `.^(210)Po` is 5.3 MeV. The half life of this alpha emitter is 138 days. (a) What mass of `.^(210)Po` is need

Correct Answer - [88.4 mg, 0.16 watt]

2 Answers 2 views
X