Physics, Chemistry, Mathematics Forums

which is more easy to take place - HYDRIDE SHIFT or METHYL SHIFT  and WHY ?

If Sigma(x) = x+y+z what is Sigma (x³ -yz) ?

f(x) be a non -negative continous function such that the area bounded by the curve y=f(x),x-axis and the ordinates x=pi/4 and x=k.pi/4 is

[k sink + pi/4 cosk +2^1/2k],then f(pi/4) is

Suppose if two motorcycles are moving in the same direction with different speeds. The speed of motorcycle A is 60 m/s and of B is 80 m /s. So the rider A would say that rider B is moving with a velocity 20 m/ s ( V_B - V_A) . But if someone is in a boat and it  is sailing in a river which is flowing downstream then he/she  says that the speed of the boat is  the original speed of the boat + the speed of the river downstream. Is it correct?

 If f(1) = 3 and f '(1)= -1/3 then the derivative of

( x¹¹+f(x))^-2 at x=1 is

answer is f '(1)

a wave travelling along the x-axis is described by the equation y(x,t)=0.005 cos(lx-mt).if the wavelength and the time period of the waves are 0.08m and 2.0s respectively,then l and m in appropriate units are.

plse explain

the parabola  y²=ax cuts x²-y²=2a² at P and Q. the tangent at P to the hyperbola cuts the parabola again in R.The area of curvilinear triangle PQR is.

plse explain

 

a block is projected up a frictionless inclined plane with a initial speed v = 3.50 m /sec. the angle of incline is theta = 32 degree. how far up the plane does it go ?

Prove that

tan² pie/16 +  tan²  2 pie/16 + tan²  3pie/ 16 ........ + tan²  6 pie/16  + tan²  7 pie/16 = 35

Please reply with solution. Thanks!

 

When the light of wavelength 470 nm falls on the surface of potassium metal, electrons are emitted with velocity of 6.4 * 10⁴ ms^-1. Calculate the minimum energy required per mole to remove an electron from potassium metal?

Is E= h/v and avagadro's constant sufficient for this question. ? and if yes then where do we use wavelength and potassium metal.

Reply with solution.

Thanks!