Two projectiles are thrown with same initial velocity making an angle of $45^{\circ}$ and $30^{\circ}$ with the horizontal respectively. The ratio of their respective ranges will be (1) $1 : \sqrt { 2 }$ (2) $\sqrt { 2 } : 1$ (3) $2 : \sqrt { 3 }$ (4) $\sqrt { 3 } : 2$
Two masses $M _ { 1 }$ and $M _ { 2 }$ are tied together at the two ends of a light inextensible string that passes over a frictionless pulley. When the mass $M _ { 2 }$ is twice that of $M _ { 1 }$, the acceleration of the system is $a _ { 1 }$. When the mass $M _ { 2 }$ is thrice that of $M _ { 1 }$, the acceleration of the system is $a _ { 2 }$. The ratio $\frac { a _ { 1 } } { a _ { 2 } }$ will be (1) $\frac { 1 } { 3 }$ (2) $\frac { 2 } { 3 }$ (3) $\frac { 3 } { 2 }$ (4) $\frac { 1 } { 2 }$
A ball of mass 0.15 kg hits the wall with its initial speed of $12 \mathrm{~m~s}^{-1}$ and bounces back without changing its initial speed. If the force applied by the wall on the ball during the contact is 100 N, calculate the time duration of the contact of ball with the wall. (1) 0.018 s (2) 0.036 s (3) 0.009 s (4) 0.072 s
A body of mass 8 kg and another of mass 2 kg are moving with equal kinetic energy. The ratio of their respective momenta will be (1) $1 : 1$ (2) $2 : 1$ (3) $1 : 4$ (4) $4 : 1$
If $\vec { A } = 2 \hat { \mathrm { i } } + 3 \hat { \mathrm { j } } - \hat { \mathrm { k } }$ m and $\vec { B } = \hat { \mathrm { i } } + 2 \hat { \mathrm { j } } + 2 \hat { \mathrm { k } }$ m. The magnitude of component of vector $\vec { A }$ along vector $\vec { B }$ will be $\_\_\_\_$ m.
As per given figures, two springs of spring constants $K$ and $2K$ are connected to mass $m$. If the period of oscillation in figure (a) is 3 s, then the period of oscillation in figure (b) will be $\sqrt { x }$ s. The value of $x$ is $\_\_\_\_$.
Let the abscissae of the two points $P$ and $Q$ on a circle be the roots of $x ^ { 2 } - 4 x - 6 = 0$ and the ordinates of $P$ and $Q$ be the roots of $y ^ { 2 } + 2 y - 7 = 0$. If $PQ$ is a diameter of the circle $x ^ { 2 } + y ^ { 2 } + 2 a x + 2 b y + c = 0$, then the value of $a + b - c$ is (1) 12 (2) 13 (3) 14 (4) 16
The equation of a common tangent to the parabolas $y = x ^ { 2 }$ and $y = -(x - 2) ^ { 2 }$ is (1) $y = 4 x - 2$ (2) $y = 4 x - 1$ (3) $y = 4 x + 1$ (4) $y = 4 x + 2$