How much protein does a $250 \ kg$ cow produce in a day (in $g$)?

With respect to chlorobenzene,which of the following statements is not correct?

$\int (1+x-x^{-1}) e^{x+x^{-1}} dx$ is equal to :

At a given instant of time,two particles have position vectors $4 \hat{i} + 4 \hat{j} + 57 \hat{k} \text{ m}$ and $2 \hat{i} + 2 \hat{j} + 5 \hat{k} \text{ m}$ respectively. If the velocity of the first particle is $0.4 \hat{i} \text{ ms}^{-1}$,what is the velocity of the second particle in $\text{ms}^{-1}$ if they collide after $10 \text{ s}$?

Ammonia with excess of $Cl_2$ forms:

If the distance between the centres of the Earth and the Moon is $D$ and the mass of the Earth is $81$ times the mass of the Moon,then at what distance from the centre of the Earth will the net gravitational field be zero?