If A+B+C=

FIND THE MINIMUM VALUE OF cot²A+cot²B+cot²C.

 

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Find the value of

cos 6 X cos42 X cos66 X cos78

Angles are in degrees, X stands for multiplication.

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Q. Please solve Question no. 50 of Hc Verma (1st book.)

         {work,energy,power}

 

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The sequence is

1+1=2

1x2+2=4

1x2x3+3=9

1x2x3x4+4=28

1x2x3x4x5+5=125

and so on........

 

plzzz rate me for my answer.

Important thing is that (1/3+1/9+1/27+1/81...............infinity) can be taken as 1/2.

 

                        log     (1/3+1/9+1/27+1/81...............infinity)

                             2.5

                  (0.16)

 

(0.4)^2log1/2

 

(2/5)^log1/4     {log has base2.5}

 

(5/2)^-log1/4

 

(5/2)^log4    {log has base 2.5}

 

=4

 

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Prove that if x is real, the minimum value of (a+x)(b+x)

                                                               ---------------

                                                                    (c+x)

for x>-c , a>c, b>c

is

In the figure , the bigger angle is =+30degrees

By vector laws,

tan 30= 150 sin/20+150cos

If u want to find alpha(angle with AB) it can be found. angle with the vertical  can also be found.

 

Hope this helps.

Nudge me for explanations.

In the given figure, m1=300g and m2=600g. The system is released from rest.The larger is stopped two second after the system set into motion. Find time elapsed when the string is tight again.

Someone plzz help me with problem 23 and 28 of class 11 hc verma,newtons laws, on page 80 and 81.

 

23) consider the atwood machine...................................

28)Let m₁₌ 1 kg , m₂= 2kg ,m₃= 3kg ..............................

 

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Q. A force F(vector)=v(vector) x A(vector) is exerted on a particle in addition to the force of gravity, where v(vector) is the velocity of the particle and A(vector) is a constant vector in the horizontal direction. With what minimum speed a particle of mass m be projected so that it continues ti=o move undeflected with a constant velocity??

 

Plzz help me with a detailed answer.

Salutes assured for all acceptable answers.

Sorry,friends  i gave the topic "kinematics" by mistake. It is Newton's Laws Of Motion.

Plzz help.

Plzz help me with pg. 80, q.20 and q.23 of H.C Verma, Class 11.

 

I have a test tomorrow, plzzz help.....

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