Home
Class 11
PHYSICS
A person walks up a stalled 15 m long es...

A person walks up a stalled 15 m long escalator in 90 s. When standing on the same escalator, now moving, the person is carried up in 60 s. How much time would it take that person to walk up the moving escalator? Does the answer depend on the length of the escalator?

Text Solution

Verified by Experts

The correct Answer is:
C
`v_1`=speed of persion
`v_2`=speed pf escalator
`v_1=l/(t_1)` and `v_2=l/(t_2)`
`:. t=l/(v_1+v_2)=l/((l/t_1)+(l/t_2))`
`=(t_1t_2)/(t_1+t_2)=(90xx60)/(90+60)=36s`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • KINEMATICS

    DC PANDEY|Exercise Subjective|51 Videos

  • KINEMATICS

    DC PANDEY|Exercise More Than One Correct|6 Videos

  • KINEMATICS

    DC PANDEY|Exercise Assertion And Reason|12 Videos

  • GRAVITATION

    DC PANDEY|Exercise (C) Chapter Exercises|45 Videos

  • KINEMATICS 1

    DC PANDEY|Exercise INTEGER_TYPE|15 Videos

Similar Questions

Explore conceptually related problems

A person walks up a stationary escalator in time t_(1) . If he remains stationary on the escalator, then it can take him up in time t_(2) . How much time would it take for him to walk up the moving escalator?

A person walks up a stationary escalator in t_(1) second. If he remains stationary on the escalator. Then it can take him up in t_(2) swcond. If the length of the escalator is L , then a. Determine the speed of man with with respect to the escalator. b. Derermine the speed of the escalator. How much time would take him to walk up the moving escaltor?.

Knowledge Check

  • A person walks up a stalled escalator in 90 s. When standingon the same escalator, now moving, he is carried in 60 s.The time it would take him to walk up the moving escalator will be:

    A
    27 s
    B
    72 s
    C
    18 s
    D
    36 s

  • A person climbs up a stalled escalator in 60s. If standing on the same but escalator running with constant velocity, he takes 40 s. How much time is taken by the person to walk up the moving escalator?

    A
    37 s
    B
    27 s
    C
    24 s
    D
    45 s

  • At a metro station, a girl walks up a stationary escalator in time t_1 If she remains stationary on the escalator, then the escalator take her up in time t_2 . The time taken by her to walk up the moving escalator will be.

    A
    `(t_1 + t_2)//(2)`
    B
    `t_1 t_2//(t_2 - t_1)`
    C
    `t_1 t_2//(t_2 + t_1)`
    D
    `t_1 - t_2`

    • Similar Questions

    Explore conceptually related problems

    A man can walk up a l'moving-upl' escalator in 30 seconds.The same man can walk down this ''moving-upl' escalator in 90 seconds.Assume that his walking speed is same upwards.Assume downwards.How much time will he take to walk up the escalator,when it is not moving? 30backslash sec b.45backslash sec c.60backslash sec d.90backslash sec

    A person is standing on a escalator which is moving up uniformly. Find out work done by the normal force acting on the man due to the cscalator while his mass is m and he gains height h due to movement of the escalator.

    At a metro station, a girl walks up a stationary escalator in time t_(1-) . If she remains stationary on the escalator, then the escalator takes her up in time t_(2) . The time taken by her to walk up on the moving escalator will be :

    Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t_(1) . On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time t_(2) . The time taken by her to walk up on the moving escalator will be:

    Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t_1 . On other days, if the remains stationary on the moving escalator, then the escalator takes her up in time t_2 . The time taken by her to walk up on the moving escalator will be :

    Home
    Profile