Physics-
General
Easy

Question

Two forces, each equal to F, act as shown in figure. Their resultant is

  1. fraction numerator F over denominator 2 end fraction    
  2. F    
  3. square root of 3 blank F    
  4. square root of 5 blank end root F    

The correct answer is: F


    Note that the angle between two forces is 120degree and not 60degree.
    R to the power of 2 end exponent equals F to the power of 2 end exponent plus F to the power of 2 end exponent plus 2 F to the power of 2 end exponent c o s 120 degree
    or R to the power of 2 end exponent equals 2 F to the power of 2 end exponent plus 2 F to the power of 2 end exponent open parentheses negative fraction numerator 1 over denominator 2 end fraction close parentheses equals F to the power of 2 end exponent
    or R equals F

    Book A Free Demo

    +91

    Grade*

    Related Questions to study

    General
    chemistry-

    The reaction given below is called: C subscript 2 H subscript 5 O H plus S O C l subscript 2 ⟶ C subscript 2 H subscript 5 C l plus S O subscript 2 plus H C l

    It is name reaction.

    The reaction given below is called: C subscript 2 H subscript 5 O H plus S O C l subscript 2 ⟶ C subscript 2 H subscript 5 C l plus S O subscript 2 plus H C l

    chemistry-General
    It is name reaction.
    General
    chemistry-

    I s o- butyl alcohol  A True statement about  is

    I s o - butyl alcohol is secondary alcohol 

    I s o- butyl alcohol  A True statement about  is

    chemistry-General
    I s o - butyl alcohol is secondary alcohol 
    General
    chemistry-

    General formula of primary alcohol is:

    General formula of primary alcohol is:

    chemistry-General
    General
    maths-

    If A equals d i g left parenthesis 2 comma negative 1 , 3 right parenthesis comma B equals d i g left parenthesis negative 1 , 3 comma 2 right parenthesis, then A to the power of 2 end exponent B equals

    A to the power of 2 end exponent B equals left parenthesis A. A right parenthesis B equals open square brackets table row 2 0 0 row 0 cell negative 1 end cell 0 row 0 0 3 end table close square brackets open square brackets table row 2 0 0 row 0 cell negative 1 end cell 0 row 0 0 3 end table close square brackets. open square brackets table row cell negative 1 end cell 0 0 row 0 3 0 row 0 0 2 end table close square brackets
    equals open square brackets table row 4 0 0 row 0 1 0 row 0 0 9 end table close square brackets open square brackets table row cell negative 1 end cell 0 0 row 0 3 0 row 0 0 2 end table close square brackets equals open square brackets table row cell negative 4 end cell 0 0 row 0 3 0 row 0 0 18 end table close square brackets.

    If A equals d i g left parenthesis 2 comma negative 1 , 3 right parenthesis comma B equals d i g left parenthesis negative 1 , 3 comma 2 right parenthesis, then A to the power of 2 end exponent B equals

    maths-General
    A to the power of 2 end exponent B equals left parenthesis A. A right parenthesis B equals open square brackets table row 2 0 0 row 0 cell negative 1 end cell 0 row 0 0 3 end table close square brackets open square brackets table row 2 0 0 row 0 cell negative 1 end cell 0 row 0 0 3 end table close square brackets. open square brackets table row cell negative 1 end cell 0 0 row 0 3 0 row 0 0 2 end table close square brackets
    equals open square brackets table row 4 0 0 row 0 1 0 row 0 0 9 end table close square brackets open square brackets table row cell negative 1 end cell 0 0 row 0 3 0 row 0 0 2 end table close square brackets equals open square brackets table row cell negative 4 end cell 0 0 row 0 3 0 row 0 0 18 end table close square brackets.
    General
    chemistry-

    Diethyl ether is soluble in:

    Soluble in strong acids ethers are Lewis base.

    Diethyl ether is soluble in:

    chemistry-General
    Soluble in strong acids ethers are Lewis base.
    General
    chemistry-

    Glycerol reacts with potassium bisulphate to produce

    Glycerol is dehydrated on heating with K H S O subscript 4

    Glycerol reacts with potassium bisulphate to produce

    chemistry-General
    Glycerol is dehydrated on heating with K H S O subscript 4
    General
    maths-

    If [m n]open square brackets table row m row n end table close square brackets equals left square bracket 25 right square bracket and m< n, then (m, n) =

    It is obvious that (m,n) =(3, 4).

    If [m n]open square brackets table row m row n end table close square brackets equals left square bracket 25 right square bracket and m< n, then (m, n) =

    maths-General
    It is obvious that (m,n) =(3, 4).
    General
    chemistry-

    Power alcohol is a mixture of petrol and alcohol in the ratio:

    Power alcohol is used to generate power.

    Power alcohol is a mixture of petrol and alcohol in the ratio:

    chemistry-General
    Power alcohol is used to generate power.
    General
    chemistry-

    The compound that will react most readily with N a O H to form methanol is:

    open parentheses C H subscript 3 close parentheses subscript 4 N to the power of plus I to the power of minus not stretchy ⟶ with N a O H on top open parentheses C H subscript 3 close parentheses subscript 4 N to the power of plus O H to the power of minus not stretchy rightwards arrow with straight capital delta on top open parentheses C H subscript 3 close parentheses subscript 3 N plus C H subscript 3 O H The reaction is more spontaneous for a better leaving group, I to the power of minus Also, methyl group with plus N will disperse plus v e spacecharge on N-atom to release I to the power of minus easily.

    The compound that will react most readily with N a O H to form methanol is:

    chemistry-General
    open parentheses C H subscript 3 close parentheses subscript 4 N to the power of plus I to the power of minus not stretchy ⟶ with N a O H on top open parentheses C H subscript 3 close parentheses subscript 4 N to the power of plus O H to the power of minus not stretchy rightwards arrow with straight capital delta on top open parentheses C H subscript 3 close parentheses subscript 3 N plus C H subscript 3 O H The reaction is more spontaneous for a better leaving group, I to the power of minus Also, methyl group with plus N will disperse plus v e spacecharge on N-atom to release I to the power of minus easily.
    General
    maths-

    The system of equations alpha x plus y plus z equals alpha minus 1 x plus alpha y plus z equals alpha minus 1 x plus y plus alpha z equals alpha minus 1has no solution, if alpha is

    For no solution or infinitely many solutions open vertical bar table row alpha 1 1 row 1 alpha 1 row 1 1 alpha end table close vertical bar equals 0 rightwards double arrow alpha equals 1 comma alpha equals negative 2.
    But for alpha equals 1, clearly there are infinitely many solutions and when we put alpha equals negative 2 in given system of equations and adding them together L.H.S not equal to R.H.S. i.e., No solution.

    The system of equations alpha x plus y plus z equals alpha minus 1 x plus alpha y plus z equals alpha minus 1 x plus y plus alpha z equals alpha minus 1has no solution, if alpha is

    maths-General
    For no solution or infinitely many solutions open vertical bar table row alpha 1 1 row 1 alpha 1 row 1 1 alpha end table close vertical bar equals 0 rightwards double arrow alpha equals 1 comma alpha equals negative 2.
    But for alpha equals 1, clearly there are infinitely many solutions and when we put alpha equals negative 2 in given system of equations and adding them together L.H.S not equal to R.H.S. i.e., No solution.
    General
    chemistry-

    Dialkylsulphides are known as:

    R long dash S long dash R space o r space R long dash S R apostrophe space are thioethers.

    Dialkylsulphides are known as:

    chemistry-General
    R long dash S long dash R space o r space R long dash S R apostrophe space are thioethers.
    General
    chemistry-

    How many isomers of C subscript 5 H subscript 1 1 O H will be primary alcohols?

    How many isomers of C subscript 5 H subscript 1 1 O H will be primary alcohols?

    chemistry-General
    General
    chemistry-

    The formula for allyl alcohol is:

    long dash O H g p. i s space o n space a l l y l space g p. space left parenthesis C H subscript 2 equals C H long dash C H subscript 2 long dash right parenthesis

    The formula for allyl alcohol is:

    chemistry-General
    long dash O H g p. i s space o n space a l l y l space g p. space left parenthesis C H subscript 2 equals C H long dash C H subscript 2 long dash right parenthesis
    General
    chemistry-

    Alcohols may behave as:

    Alcohols are neutral as they do not influence the pH. Due to — bond, they possess Bronsted acid nature showing cleavage of — bond. Also due to the presence of lone pair of electron on oxygen atom, they act as Lewis base. The reactivity order is based on  of alkyl groups.
    Lewis base order : 3 space ͦ greater than 2 space ͦ greater than 1 space ͦ Bronsted acid order : 1 space ͦ greater than 2 space ͦ greater than 3 space ͦ

    Alcohols may behave as:

    chemistry-General
    Alcohols are neutral as they do not influence the pH. Due to — bond, they possess Bronsted acid nature showing cleavage of — bond. Also due to the presence of lone pair of electron on oxygen atom, they act as Lewis base. The reactivity order is based on  of alkyl groups.
    Lewis base order : 3 space ͦ greater than 2 space ͦ greater than 1 space ͦ Bronsted acid order : 1 space ͦ greater than 2 space ͦ greater than 3 space ͦ
    General
    maths-

    Lt subscript x not stretchy rightwards arrow 0 end subscript space fraction numerator x left parenthesis 1 plus a cos space x right parenthesis minus b sin space x over denominator x cubed end fraction equals 1 then a=, b=

    Lt subscript x not stretchy rightwards arrow 0 end subscript space fraction numerator x left parenthesis 1 plus a cos space x right parenthesis minus b sin space x over denominator x cubed end fraction equals 1 then a=, b=

    maths-General