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If force $F$ is increasing with time and at $t=0, F=0$,where will slipping first start?

The potential difference $V$ and the current $i$ flowing through an instrument in an $ac$ circuit of frequency $f$ are given by $V = 5 \cos \omega t \text{ volts}$ and $i = 2 \sin \omega t \text{ amperes}$ (where $\omega = 2\pi f$). The power dissipated in the instrument is....$W$

$A$ bullet of mass $2\, g$ has a charge of $2\, \mu C$. Through what potential difference must it be accelerated,starting from rest,to acquire a speed of $10\, m/s$?

Blood enters the heart because of......

If the circle $x^2 + y^2 + 6x - 2y + k = 0$ bisects the circumference of the circle $x^2 + y^2 + 2x - 6y - 15 = 0$,then $k =$