Home
Class 12
PHYSICS
A man of height h is walking at constant...

A man of height `h` is walking at constant speed `v_(0)` along edge of a straight horizontal road. There is a lamp post of height `H=2h` on the other edge as shown. If speed of tip of shadow of his head is `nv_(0)` then find `n`.

Text Solution

Verified by Experts

The correct Answer is:
2

`x=H/(H-h)I`
`y=(H/(H-h))y^'`
`(dx)/(dt)=0` & `(dy)/(dt)=(H/(H-h))V_(0)`
Promotional Banner

Topper's Solved these Questions

  • TEST PAPERS

    RESONANCE ENGLISH|Exercise PART - II PHYSICS|106 Videos
  • SIMPLE HARMONIC MOTION

    RESONANCE ENGLISH|Exercise Advanced Level Problems|13 Videos
  • TEST SERIES

    RESONANCE ENGLISH|Exercise PHYSICS|130 Videos

Similar Questions

Explore conceptually related problems

A man of height 'h' is walking away from a street lamp with a constant speed 'v'. The height of the street lamp is 3h. The rate at which the length of the man's shadow is increasing when he is at a distance 10 h from the base of the street lamp is

A 2-m wide truck is moving with a uniform speed v_(0)=8 ms^(-1) along a straight horizontal road. A pedestrian starts to cross the road with a uniform speed v when the truck is 4 m away from him, The minimum value of v so that he can cross the road safely is .

A man 2 metres tall walks away from a lamp post 5 metres height at the rate of 4.8 km/hr. The rate of increase of the length of his shadow, is

An inclined plane is located at angle alpha = 53^(@) to the horizontal. There is a hole at point B in the inclined plane as shown in the figure. A particle is projected along the plane with speed v_(0) at an angle beta = 37^(@) to the horizontal in such a way so that it gets into the hole. Neglect any type of friction. Find the speed v_(0) (in ms^(-1) ) if h = 1 m and l = 8m.

A dics is rotating in a room. A boy standing near the rim of the disc of radius R finds the water droplet falling from the ceiling is always falling on his head. As one drop hits his head, other one starts from the ceiling. If height of the roof above his head is H , then angular velocity of the disc is

A man of height 1.7 m walks at a uniform speed of 6.6 m/min from a lamp post which is 5m high.Find the rate at which the length of his shadow increases.

A girl of height 90 cm is walking away from the base of a lamp-post at a speed of 1.2 m/s. If the lamp is 3.6 m above the ground, find the length of her shadow after 4 seconds.

A girl of height 90 cm is walking away from the base of a lamp-post at a speed of 1.2 m/s. If the lamp is 3.6 m above the ground, find the length of her shadow after 4 seconds.

A man of height 6 ft walks at a uniform speed of 9 ft/sec from a lamp fixed at 15 ft height. The length of his shadow is increasing at the rate of (a) 15 ft/sec (b) 9 ft/sec (c) 6 ft/sec (d) none of these

A car is moving along a straight horizontal road with a speed v_(0) . If the coefficient of friction between the tyres and the road is mu , the shortest distance in which the car can be stopped is

RESONANCE ENGLISH-TEST PAPERS-PHYSICS
  1. Four metallic plates are sued to form two identical parallel plate cap...

    Text Solution

    |

  2. There exist uniform magnetic field vec(B)=5T(-hat(j)) from x=0 to x=2m...

    Text Solution

    |

  3. A man of height h is walking at constant speed v(0) along edge of a st...

    Text Solution

    |

  4. Current P through a certain non-metallic rod is given as i(0)=0.2V^((3...

    Text Solution

    |

  5. A drum and its braking system are shown in figure. The drum of radius ...

    Text Solution

    |

  6. A massless stick of length L is hinged at one end and a mass m attache...

    Text Solution

    |

  7. Seven identical disc are arranged in a hexagonal, planar pattern so as...

    Text Solution

    |

  8. The total energy radiated from a black body source is callocted for on...

    Text Solution

    |

  9. Two perpendicular circular loops of radius 'a' and 'b' carry currents ...

    Text Solution

    |

  10. Equal volumes of two immiscible liquids of densities rho and 3rho are ...

    Text Solution

    |

  11. A conducting wire, bent in the from of a parabour y^(2)= 2x carrie...

    Text Solution

    |

  12. Two water drops of radii R(1) and R(2) are falling with their terminal...

    Text Solution

    |

  13. A uniform magnetic field exista in reign given by . A rod of length 5m...

    Text Solution

    |

  14. A circular loop is bent so that half of (OAB) lies in xy- plane ane th...

    Text Solution

    |

  15. In each of three figure shown, two blocks are connected by a light spr...

    Text Solution

    |

  16. In the given circuit, in steady state we may say: (capacitor are initi...

    Text Solution

    |

  17. Two wires have identical lengths and areas of cross-section are suspen...

    Text Solution

    |

  18. The magnetic flux (phi) linked with the coil depends on time t as phi=...

    Text Solution

    |

  19. The wire as shown in figure is bent in the shape of a tent, with theta...

    Text Solution

    |

  20. Two smooth spheres A and B of masses 4kg and 8kg move with velocities ...

    Text Solution

    |