What is the value of $x$ if $2x + 5 = 15$?

If a force $F$ is applied on a body and it moves with a velocity $v$,the power will be

$A$ particle $P$ is moving in a circle of radius $a$ with a uniform speed $v$. $C$ is the centre of the circle and $AB$ is a diameter. When passing through $B$,the angular velocity of $P$ about $A$ and $C$ are in the ratio:

The pair of compounds which cannot exist together in aqueous solution is
$I$. $NaH_2PO_4$ and $NaHCO_3$
$II$. $Na_2CO_3$ and $NaHCO_3$
$III$. $NaOH$ and $NaH_2PO_2$
$IV$. $NaHCO_3$ and $NaOH$

In a series $LCR$ circuit,what will be the nature of the circuit for frequencies higher than the resonance frequency?

Which of the following has the maximum melting point?