Physics-
General
Easy

Question

An elevator car, whose floor to ceiling distance is equal to 2.7m comma starts ascending with constant acceleration of 1.2 m s to the power of negative 2 end exponent. 2 s e c after the start, a bolt begins falling from the ceiling of the car. The free fall time of the bolt is

  1. square root of 0.54 end root s  
  2. square root of 6 blank end root s  
  3. 0.7 blank s  
  4. 1 blank s  

The correct answer is: 0.7 blank s


    t equals square root of fraction numerator 2 h over denominator left parenthesis g plus a right parenthesis end fraction end root equals square root of fraction numerator 2 cross times 2.7 over denominator left parenthesis 9.8 plus 1.2 right parenthesis end fraction end root equals square root of fraction numerator 5.4 over denominator 11 end fraction end root equals square root of 0.49 end root equals 0.7 blank s e c
    As u equals 0 and lift is moving upward with acceleration

    Related Questions to study

    General
    Physics-

    A point starts moving in a straight line with a certain acceleration. At a time t after beginning of motion the acceleration suddenly becomes retardation of the same value. The time in which the point returns to the initial point is

    A point starts moving in a straight line with a certain acceleration. At a time t after beginning of motion the acceleration suddenly becomes retardation of the same value. The time in which the point returns to the initial point is

    Physics-General
    General
    Physics-

    A ball which is at rest is dropped from a height h metre. As it bounces off the floor its speed is 80% of what it was just before touching the ground. The ball then rise to nearly a height

    A ball which is at rest is dropped from a height h metre. As it bounces off the floor its speed is 80% of what it was just before touching the ground. The ball then rise to nearly a height

    Physics-General
    General
    Physics-

    Which of the following options is correct for the object having a straight line motion represented by the following graph

    Which of the following options is correct for the object having a straight line motion represented by the following graph
    Physics-General

    parallel
    General
    Physics-

    A body begins to walk eastward along a street in front of his house and the graph of his position from home is shown in the following figure. His average speed for the whole time interval is equal to

    A body begins to walk eastward along a street in front of his house and the graph of his position from home is shown in the following figure. His average speed for the whole time interval is equal to
    Physics-General

    General
    Physics-

    The displacement of a body is given by 2 s equals g t to the power of 2 end exponent comma where g is a constant. The velocity of the body at any time t is

    The displacement of a body is given by 2 s equals g t to the power of 2 end exponent comma where g is a constant. The velocity of the body at any time t is

    Physics-General
    General
    Physics-

    A particle is moving with uniform acceleration along a straight line. The average velocity of the particle from P to Q is 8 m s to the power of negative 1 end exponent and that from Q to Sis 12 m s to the power of negative 1 end exponent. If Q S minus P Q, then the average velocity from P to S is

    A particle is moving with uniform acceleration along a straight line. The average velocity of the particle from P to Q is 8 m s to the power of negative 1 end exponent and that from Q to Sis 12 m s to the power of negative 1 end exponent. If Q S minus P Q, then the average velocity from P to S is
    Physics-General

    parallel
    General
    Physics-

    A bullet is fired with a speed of 1000 blank m divided by s e c in order to hit a target 100 blank m away. If g equals 10 blank m divided by s to the power of 2 end exponent, the gun should be aimed

    A bullet is fired with a speed of 1000 blank m divided by s e c in order to hit a target 100 blank m away. If g equals 10 blank m divided by s to the power of 2 end exponent, the gun should be aimed

    Physics-General
    General
    Physics-

    A body having uniform acceleration of 10m s to the power of negative 2 end exponent has a velocity of 100m s to the power of negative 1 end exponent. In what time, the velocity will be doubled?

    A body having uniform acceleration of 10m s to the power of negative 2 end exponent has a velocity of 100m s to the power of negative 1 end exponent. In what time, the velocity will be doubled?

    Physics-General
    General
    Physics-

    A police jeep is chasing with velocity of 45 blank k m divided by ha thief in another jeep moving with velocity 153 blank k m divided by h. Police fires a bullet with muzzle velocity of 180 blank m divided by s. The velocity with which it will strike the car of the thief is

    A police jeep is chasing with velocity of 45 blank k m divided by ha thief in another jeep moving with velocity 153 blank k m divided by h. Police fires a bullet with muzzle velocity of 180 blank m divided by s. The velocity with which it will strike the car of the thief is

    Physics-General
    parallel
    General
    Physics-

    A stone dropped from of the tower touches the ground in 4 blank s e c. The height of the tower is aboout

    A stone dropped from of the tower touches the ground in 4 blank s e c. The height of the tower is aboout

    Physics-General
    General
    Physics-

    The engine of motorcycle can produce a maximum acceleration 5 blank m divided by s to the power of 2 end exponent. Its brakes can produce a maximum retardation 10 blank m divided by s to the power of 2 end exponent. What is the minimum time in which it can over a distance of 1.5 blank k m

    The engine of motorcycle can produce a maximum acceleration 5 blank m divided by s to the power of 2 end exponent. Its brakes can produce a maximum retardation 10 blank m divided by s to the power of 2 end exponent. What is the minimum time in which it can over a distance of 1.5 blank k m

    Physics-General
    General
    Physics-

    A train of 150 blank m length is going towards north direction at a speed of 10 m divided by s e c. A parrot flies at the speed of 5 blank m divided by s e c towards south direction parallel to the railway track. The time taken by the parrot to cross the train is

    A train of 150 blank m length is going towards north direction at a speed of 10 m divided by s e c. A parrot flies at the speed of 5 blank m divided by s e c towards south direction parallel to the railway track. The time taken by the parrot to cross the train is

    Physics-General
    parallel
    General
    Physics-

    If the velocity of a particle is open parentheses 10 plus 2 t to the power of 2 end exponent close parentheses m divided by s, then the average acceleration of the particle between 2 s and 5 s is

    If the velocity of a particle is open parentheses 10 plus 2 t to the power of 2 end exponent close parentheses m divided by s, then the average acceleration of the particle between 2 s and 5 s is

    Physics-General
    General
    Physics-

    Two stones of equal masses are dropped from a rooftop of height h one after another. Their separation distance against time will

    Two stones of equal masses are dropped from a rooftop of height h one after another. Their separation distance against time will

    Physics-General
    General
    Physics-

    A wheel of radius 1 blank m rolls forward half a revolution on a horizontal ground. The magnitude of the displacement of the point of wheel initially in contact with the ground is

    A wheel of radius 1 blank m rolls forward half a revolution on a horizontal ground. The magnitude of the displacement of the point of wheel initially in contact with the ground is

    Physics-General
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.