Class 11th

In two different experiments, an object of mass 5kg moving with a speed of 25 ms^-1 hits two different walls and comes to rest within (i) 3 second, (ii) 5 seconds, respectively.

Choose the correct option out of the following:

A NCC parade is going at a uniform speed of 9 km/h under a mango tree on which a monkey is sitting at a height of 19.6m. At any particular instant, the monkey drops a mango. A cadet will receive the mango whose distance from the tree at time of drop is:

(Given g = 9.8 m/s²)

Is the escape speed same for all objects?

What is the speed of escape from Earth?

What is escape velocity for physics Class 11?

The sum of two forces $\vec{P}$ and $\vec{Q}$ is $\vec{R}$ such that $\left|\vec{R}\right|=\left|\vec{P}\right|$ . The angle $\theta$ (in degrees) that the resultant of $2\vec{P}$ and $\vec{Q}$ will make with $\vec{Q}$  is,               

A particle $(m=1\mathrm{k}\mathrm{g})$  slides down a frictionless track (AOC) starting from rest of a point $A$  (height $2\mathrm{m}$  ). After reaching $C$ , the particle continues to move freely in air as a projectile. When it leading its highest point $\mathrm{P}$  (height 1 m  ) the kinetic energy of the particle (in J) is: (Figure drawn is schematic and not to scale (take $g=10{\mathrm{m}\mathrm{s}}^{-2}$  ) 

A non-isotropic solid metal cube has coefficients of linear expansion as: $5*{10}^{-5}/{}^{\circ }\mathrm{C}$  along the $x=$  axis and $5*{10}^{-6}/{}^{\circ }\mathrm{C}$  along the $y$  and the $z$ -axis. If coefficient of volume expansion of the solid $\mathrm{C}*{10}^{-6}/{}^{\circ }\mathrm{C}$  then the value of $\mathrm{C}$  is                   

$\mathrm{M}$ grams of steam at  ${100}^{\circ }\mathrm{C}$ is mixed with $200\mathrm{g}$ of ice at its melting point in a thermally insulated container. If it produces liquid water at ${40}^{?}\mathrm{C}$ [heat of vaporization of water is $540\mathrm{c}\mathrm{a}\mathrm{l}/\mathrm{g}$ and heat of fusion of ice is $80\mathrm{c}\mathrm{a}\mathrm{l}/\mathrm{g}$ ], the value of $M$  is     

A Carnot engine operates between two reservoirs of temperatures $900\mathrm{K}$  and $300\mathrm{K}$ . The engine performs $1200\mathrm{J}$  of work per cycle. The heat energy (in J) delivered by the engine to the low temperature reservoir, in a cycle is