A car with a vertical windshield moves in a rain storm at a speed of $40 \,km / hr$. The rain drops fall vertically with constant speed of $20 \,m / s$. The angle at which rain drops strike the windshield is .........
A car with a vertical windshield moves in a rain storm at a speed of $40 \,km / hr$. The rain drops fall vertically with constant speed of $20 \,m / s$. The angle at which rain drops strike the windshield is .........
- A
$\tan ^{-1} \frac{5}{9}$
- B
$\tan ^{-1} \frac{9}{5}$
- C
$\tan ^{-1} \frac{3}{2}$
- D
$\tan ^{-1} \frac{2}{3}$
Similar Questions
A swimmer crosses a river of width $d$ flowing at velocity $v$. While swimming, he heads himself always at an angle of $120^{\circ}$ with the river flow and on reaching the other end he finds a drift of $d / 2$ in the direction of flow of river. The speed of the swimmer with respect to the river is
A swimmer crosses a river of width $d$ flowing at velocity $v$. While swimming, he heads himself always at an angle of $120^{\circ}$ with the river flow and on reaching the other end he finds a drift of $d / 2$ in the direction of flow of river. The speed of the swimmer with respect to the river is
Aboat having a speed of $5\,\, km/hr$. in still water, crosses a river of width $1\,\, km$ along the shortest possible path in $15 \,\,minutes$. The speed of the river in $Km/hr.$
Aboat having a speed of $5\,\, km/hr$. in still water, crosses a river of width $1\,\, km$ along the shortest possible path in $15 \,\,minutes$. The speed of the river in $Km/hr.$
A man standing on a road hold his umbrella at $30^° $ with the vertical to keep the rain away. He throws the umbrella and starts running at $10\, km/hr$. He finds that raindrops are hitting his head vertically, the speed of raindrops with respect to the road will be......... $km/hr$
A man standing on a road hold his umbrella at $30^° $ with the vertical to keep the rain away. He throws the umbrella and starts running at $10\, km/hr$. He finds that raindrops are hitting his head vertically, the speed of raindrops with respect to the road will be......... $km/hr$
A steam boat goes across a lake and comes back $(a)$ On a quite day when the water is still and $(b)$ On a rough day when there is uniform air current so as to help the journey onward and to impede the journey back. If the speed of the launch on both days was same, in which case it will complete the journey in lesser time
A steam boat goes across a lake and comes back $(a)$ On a quite day when the water is still and $(b)$ On a rough day when there is uniform air current so as to help the journey onward and to impede the journey back. If the speed of the launch on both days was same, in which case it will complete the journey in lesser time
The system shown in figure is released then $a_1$ and $a_2$ is
The system shown in figure is released then $a_1$ and $a_2$ is