General
Easy
Physics-

The path of a projectile in the absence of air drag is shown in the figure by dotted line. If the air resistance is not ignored then which one of the path is shown in the figure is appropriate for the projectile

Physics-General

  1. D    
  2. C    
  3. B    
  4. A    

    Answer:The correct answer is: BIf air resistance is taken into consideration then range and maximum height, both will decrease

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    physics-General
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    therefore blank t equals fraction numerator 600 cross times fraction numerator 1 over denominator 2 end fraction minus 250 over denominator 10 end fraction equals 5 blank s
    H equals open parentheses u sin invisible function application theta close parentheses t minus fraction numerator 1 over denominator 2 end fraction cross times g t to the power of 2 end exponent
    equals 600 cross times fraction numerator square root of 3 over denominator 2 end fraction cross times 5 minus fraction numerator 1 over denominator 2 end fraction cross times 10 cross times 25
    H equals 2473 blank m

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    physics-General
    If it is being hit then
    d equals v subscript 0 end subscript t plus fraction numerator 1 over denominator 2 end fraction a t to the power of 2 end exponent equals left parenthesis u cos invisible function application theta right parenthesis t
    or t equals fraction numerator u cos invisible function application theta minus v subscript 0 end subscript over denominator a divided by 2 end fraction

    therefore blank t equals fraction numerator 600 cross times fraction numerator 1 over denominator 2 end fraction minus 250 over denominator 10 end fraction equals 5 blank s
    H equals open parentheses u sin invisible function application theta close parentheses t minus fraction numerator 1 over denominator 2 end fraction cross times g t to the power of 2 end exponent
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    H equals 2473 blank m
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    A particle is moving on a circular path of radius r with uniform velocity v. The change in velocity when the particle moves from P blanktoblank Q blankisblank left parenthesis angle P O Q equals 40 degree right parenthesis

    physics-General
    Change in velocity equals 2 v sin invisible function application open parentheses theta divided by 2 close parentheses equals 2 v sin invisible function application 20 degree
    General
    physics-

    A particle is projected from a point A with velocity u square root of 2 at an angle of 45 degree with horizontal as shown in figure. It strikes the plane B C at right angles. The velocity of the particle at the time of collision is

    Let v be the velocity at the time of collision

    Then, u square root of 2 cos invisible function application 45 degree equals v sin invisible function application 60 degree
    open parentheses u square root of 2 close parentheses open parentheses fraction numerator 1 over denominator square root of 2 end fraction close parentheses equals fraction numerator square root of 3 v over denominator 2 end fraction blank therefore v equals fraction numerator 2 over denominator square root of 3 end fraction u

    A particle is projected from a point A with velocity u square root of 2 at an angle of 45 degree with horizontal as shown in figure. It strikes the plane B C at right angles. The velocity of the particle at the time of collision is

    physics-General
    Let v be the velocity at the time of collision

    Then, u square root of 2 cos invisible function application 45 degree equals v sin invisible function application 60 degree
    open parentheses u square root of 2 close parentheses open parentheses fraction numerator 1 over denominator square root of 2 end fraction close parentheses equals fraction numerator square root of 3 v over denominator 2 end fraction blank therefore v equals fraction numerator 2 over denominator square root of 3 end fraction u
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    Assertion: At constanpressurfothe change H2O(s)→H2O(gwordoninegative.
    Reason: Durinphastransitiowordone ialwaynegative.

    Assertion: At constanpressurfothe change H2O(s)→H2O(gwordoninegative.
    Reason: Durinphastransitiowordone ialwaynegative.

    chemistry-General