Home
Class 12
PHYSICS
A toy car can deliver a constant power o...

A toy car can deliver a constant power of `20W`. The resistive force on the car is `alphav`, where `v` is velocity of car in `m//s`. If maximum velocity of car is `2m//s`, the value of `alpha` is .

A

`10 kg//s`

B

`5kg//s`

C

`15kg//s`

D

`5 kg//s^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
At maximum velocity, Net force is zero
So `P=Fv=(alphav)vrArr20=alpha(2)^(2)rArralpha=5kg//s`
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A car travels half the distance with a constant velocity of 40 m//s and the remaining half with a constant velocity of 60 m//s . The average velocity of the car in m//s is

A constant power P is applied to a car starting from rest. If v is the velocity of the car at time t, then:

A car of mass mhasan engine which can deliver constant power P.the maximum speed that the car can attain in t seconds in

A car moves a distance of 100 m. It coveres first half with speed of 10 m/s and another half with speed of v m/s. If the average speed of car is 18 m/s, then value of v is

A person observes a change of 2.5 % in frequency of sound of horn of a car. If the car is approaching forward the person & sound velocity is 320 m/s, then velocity of car in m/s will be approximaterly :-

A car of mass M is accelerating on a level smooth road under the action of a single force F acting along the direction of motion. The power delivered to the car is constant and equal to p. If the velocity of the car at an instant is v, then after travelling a distance of (7 Mv^3)/(3p) the velocity become kv where k is__________.

What is the velocity of the highest point of a rotating wheel of a car moving with a velocity of 20 m/s ?

ALLEN-TEST PAPER-Exercise (Physics)
  1. At t=0 two trucks A and B were at same point on the road . At t=t(1), ...

    Text Solution

    |

  2. A ball is thrown from the top of 36m high tower with velocity 5m//ss a...

    Text Solution

    |

  3. A toy car can deliver a constant power of 20W. The resistive force on ...

    Text Solution

    |

  4. If momentum (P), area (A) and time (7) are taken to be fundamental qun...

    Text Solution

    |

  5. In ancient time, deffernt system of units was following in which unit ...

    Text Solution

    |

  6. A rectangular farm house has a 1km difference between its sides. Two f...

    Text Solution

    |

  7. The graph shown the variation with times t of the velocity v of an obj...

    Text Solution

    |

  8. A ball is released from point A. During its motiom ball takes two seco...

    Text Solution

    |

  9. Velocity v//s Position graph of a particle performing curvilinear moti...

    Text Solution

    |

  10. Two identical blocks A and B each of weight 20N are placed on a fricti...

    Text Solution

    |

  11. Figure shows an At wood machine in which m(1)+m(2)=M is constant. Now ...

    Text Solution

    |

  12. As shown in the figure, Tarzan travels from one place to another by sw...

    Text Solution

    |

  13. Two equal rods joined at one end are kept on a smooth surface as shown...

    Text Solution

    |

  14. A three part rocket begins intact as a single object in distant outer ...

    Text Solution

    |

  15. A three part rocket begins intact as a single object in distant outer ...

    Text Solution

    |

  16. Five uniform circular plates, each of diameter b and mass m are laid o...

    Text Solution

    |

  17. In the figure, the L-shaped shaded piece is cut from a metal plate of ...

    Text Solution

    |

  18. The centre of mass of a non uniform rod of length L whoose mass per un...

    Text Solution

    |

  19. Find the center of mass(x,y,z) of the following structure of four iden...

    Text Solution

    |

  20. A thick uniform wire is bent into the shape of the letter "U" as shown...

    Text Solution

    |