In a mutational event,when adenine is replaced by guanine,it is the case of

$A$ metal ball of mass $2 \ kg$ moving with a velocity of $36 \ km/h$ has a head-on collision with a stationary ball of mass $3 \ kg$. After the collision,if both balls move together,the loss in kinetic energy due to the collision is: (in $J$)

Where is the pacemaker located?

Which of the following cylindrical rods will conduct the most heat when their ends are maintained at the same steady temperatures?

The equation of the tangent at $(-4, -4)$ on the curve $x^2 = -4y$ is

An unbanked curve has a radius of $60\,m$. The maximum speed at which a car can make a turn if the coefficient of static friction is $0.75$,is ...... $m/s$.