Question 1 :
A player stops a football weighting {tex}0.5{/tex} kg which comes flying towards him with a velocity of {tex} 10 \mathrm { m } / \mathrm { s } {/tex}. If the impact lasts for {tex} 1 / 50 \mathrm { th } {/tex} sec. and the ball bounces back with a velocity of {tex} 15 \mathrm { m } / \mathrm { s } {/tex}, then the average force involved is

Question 2 :
A body of mass {tex} 2 \mathrm { kg } {/tex} is placed on a horizontal surface having kinetic friction 0.4 and static friction 0.5 . If the force applied on the body is {tex} 2.5 \mathrm { N } , {/tex} then the frictional force acting on the body will be {tex} \left[ \mathrm { g } = 10 \mathrm { ms } ^ { - 2 } \right] {/tex}

Question 4 :
A bridge is in the from of a semi-circle of radius {tex} 40 \mathrm { m } {/tex}. The greatest speed with which a motor cycle can cross the bridge without leaving the ground at the highest point is {tex} \left( \mathrm { g } = 10 \mathrm { m } \mathrm { s } ^ { - 2 } \right) {/tex} (frictional force is negligibly small)

Question 5 :
If {tex} \mu _ { \mathrm { s } } , \mu _ { \mathrm { k } } {/tex} and {tex} \mu _ { \mathrm { r } } {/tex} are coefficients of static friction, kinetic friction and rolling friction, then

Question 6 :
A particle of mass {tex} m {/tex} is made to move with uniform speed {tex} v {/tex} along the perimeter of a regular polygon of {tex} n {/tex} sides, inscribed in a circle of radius {tex} a {/tex}. The magnitude of impulse applied at each corner of the polygon is :

Question 7 :
Two monkeys of masses {tex} 10 \mathrm { kg } {/tex} and {tex} 8 \mathrm { kg } {/tex} are moving along vertical rope which is light and inextensible, the former climbing up with acceleration of {tex} 2 \mathrm { m } / \mathrm { s } ^ { 2 } {/tex} while the latter coming down with a uniform velocity of {tex} 2 \mathrm { m } / \mathrm { s } {/tex}. Find the tension (in newtons).<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e101dc94faa335027dc7ae8"><br>

Question 8 :
While waiting in a car at a stoplight, and 80 kg man and his car are suddenly accelerated to a speed of 5 ms{tex}^{-1}{/tex} as a result of rear-end collision. If the time of impact is 0.4 s, find the average force on the man

Question 9 :
A block of mass {tex} \mathrm m {/tex} is placed on a smooth wedge of inclination {tex} \theta {/tex}. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block (g is acceleration due to gravity) will be

Question 10 :
A block {tex} \mathrm { B } {/tex} is pushed momentarily along a horizontal surface with an initial velocity V. If {tex} \mu {/tex} is the coefficient of sliding friction between B and the surface, block B will come to rest after a time<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e101e694faa335027dc7b6b"><br>

Question 11 :
The temperature of liquid hydrogen is $20\ K$.What is this temperature on the Fahrenheit scale?

Question 12 :
The specific heat of a substance at temperature $t^oC$ is $s=at^2+bt+c$. The amount of heat required to raise the temperature of $m\ g$ of the substance from $0^oC$ to $t_0 ^oC$, is :

Question 13 :
On a new scale of temperature (which is linear) and called the&#160;W scale, the freezing and boiling points of water are 39&#176;W and 239&#176;W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39&#176;C on the Celsius scale ?

Question 14 :
The internal energy $U$ is a unique function of any state because change in $U$.

Question 15 :
One calorie is defined as the heat required to raise the temperature of $1 \ gm$ of water by $1^{o}\mathrm{C}$ in a certain pressure. The pressure is<br/>

Question 16 :
(a) Define Heat energy<br>(b) How does heat energy flow from one body to another body?

Question 18 :
<span class="wysiwyg-font-size-small"><span class="wysiwyg-font-size-small"></span></span><p class="wysiwyg-text-align-left">The heat change associated with reactions at constant volume is due to the difference in which property of the reactants and the products ?</p>

Question 19 :
The internal energy of a piece of lead when beaten by a hammer will

Question 20 :
On which of the following scales of temperature, the temperature is never negative

Question 21 :
In a thermodynamic system working subtance is ideal gas, its internal energy is in the from of

Question 22 :
Hailstone at $0^{o}C$ falls from a height of $1\ km$ on an insulating surface converting whole of its kinetic energy into heat. What part of it will melt ? $(g=10\ m/s^{2}$)

Question 23 :
If the difference of temperature of two bodies is $5^oC$, then the difference of temperature on Kelvin scale is

Question 24 :
On a hypothetical scale A the ice point is $42^o$ and the steam point is $182^o$ For another scale B, the ice point is $-10^o$ and steam point in $90^o$) If B reads $60^o$, the reading of A is,

Question 25 :
On a $X$ temperature scale, water freezes at $-125.0^o$ X and boils at $375.0^o X$ . On a $Y$ temperature scale water freezes at $-70.0^o Y$ and boils at $-30.0^o Y $ . The value of temperature on $X$ scale equals to the temperature of $50.0^o Y $ on $Y-$ scale is :