Question 1 :
To reduce the momentum of a given body to half its original value then the velocity must be __________.<br/>
Question 3 :
One of the rectangular components of a force of 50 N is 30 N. The other rectangular component will be :
Question 4 :
Rolling friction is _____ sliding friction, if all other factors are the same.
Question 5 :
If an external force and the frictional force are acting on a body, which is in rest on the floor, and are equal and opposite, then the frictional force is:
Question 6 :
A marble is dropped vertically, Another identical marble $B$ is projected horizontally from the same point at the same instant :
Question 7 :
A particle is thrown vertically up with speed $6m/s$ find maximum height achieved
Question 8 :
A body projected at an angle with the horizontal has a range 300 m. If the time of flight is 6 s, then the horizontal component of velocity is :
Question 9 :
Assertion (A): In the motion of projectile the horizontal component of velocity remains constant Reason (R) : The force on the projectile is the gravitational force which acts only in the vertically downward direction
Question 10 :
Which one of the following is most probably not a case of uniform circular motion?
Question 11 :
At the top of the trajectory of a projectile, thrown at an angle of projection $\theta < {90}^{o}$, its
Question 12 :
A ball is projected upwards. Its acceleration at the highest point is :
Question 13 :
Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of $10\ ms^{-1}$. It implies that the boy is :<br/>
Question 15 :
A 60-kg person on a merry-go round is travelling in a circle with a radius of $3 \ m$ at a speed of $ 6 \ m/s$. What is the magnitude of the net force experienced by this person?
Question 16 :
In a uniform circular motion, the magnitude and direction of velocity at different points remain the same.
Question 18 :
A wheel is rotating at $900\space r.p.m,$ about its axis. When power is cut off it comes to rest in $1\space minute$. The angular retardation in $rad/s^2$ is:
Question 19 :
Is it possible to have an accelerated motion with a constant speed? Name such type of motion.<br>
Question 20 :
A golfer swings a golf club so that the end of the club is moving 30 m/s when it strikes the ball. The radius of the circular path for the end of the club (which includes the club and the golfer's arms ) is 1.8 m.<br>What is the centripetal acceleration of the end of the club as it strikes the ball?
Question 21 :
A cricketer hits a sixer.The cricket ball moves up with a velocityof $2 m s^{-1}$ and falls down. Its initial velocity while falling down willbe<br/>
Question 22 :
If the initial velocity of the body has both horizontal and vertical components and it is projected up by certain angle, then what is the path followed by it ?
Question 24 :
<b></b>Identify which of the following is NOT true about the projectile launched from the ground at an angle (neglecting air resistance)?<br/>
Question 25 :
In uniform circular motion, the velocity vector and acceleration vector are:
Question 26 :
In circular motion if $\bar{v}$ is velocity vector, $\bar{a}$ is acceleration vector, $\bar{r}$ is instantaneous position vector, $ \bar{p}$ is momentum vector and $\bar{\omega}$ is angular velocity of particle, then:
Question 27 :
The velocity and acceleration vectors of a particle undergoing circular motion are $\vec{v}\, =\, 2\hat{i}$ $m/s$ and $\vec{a}\, =\, 2\hat{i}\, +\, 4\hat{j}\, m/s^2$ respectively at an instant of time. The radius of the circle is
Question 28 :
A wheel rotates with the constant acceleration of $2.0\ rad/s^2 $, if the wheel starts from rest the number of revolution it makes in first ten seconds will be approximately
Question 29 :
An object is projected with a velocity of $20 m/s$ making an angle of $45$ with horizontal. The equation for the trajectory is $h = Ax - Bx^{2}$, where $h$ is height, $x$ is horizontal distance, $A$ and $B$ are constants. The ratio $A : B$ is- $($ <br> $g = 10 m/s^{2}$ <br> $)$
Question 30 :
The vectors sum of two vectors of magnitudes $10$ units and $20$ units can never be?