Turning effects of forces - class-XI
Description: turning effects of forces | |
Number of Questions: 57 | |
Created by: Avani Handa | |
Tags: systems of particles and rotational motion motion of system of particles and rigid bodies gravitation turning effects of forces physics force forces - vectors and moments |
State whether given statement is True or False.
Where is the centre of gravity of a uniform ring situated ?
Stability and center of gravity of an object whose stability can be increased by
An object can have
The centre of mass of a system of particles is at the origin. From this we conclude that :
A book is lying on a table, what is the angle between the book on the table and the weight of the book?
The center of gravity of an object
The centre of gravity of an object is ______ whether it is placed near the surface of the Earth or near the surface of the Moon.
Center of gravity of an object depends on its which of the following?
Point where whole weight of body acts vertically is called
The center of gravity of an object is
The advantages of being short and stocky is that you're less likely to get knocked over. This is because
Center of gravity is usually located where
Centre of gravity is the point
One can lean further to one side or the other without creating enough turning force to tip him over. This is because
Statement related to center of gravity that is incorrect is
What is the center of gravity of an object?
For a bowling ball, how far apart are the center of gravity and center of mass?
What is the center of mass of an object?
Which one of following statements related to center of gravity is incorrect?
The stability of a flexible body depends on:
Which of the following are the advantages of having low centre of gravity?
If linear density of a rod of length 3 m varies as $\lambda=2+x$, then the position of the centre of gravity of the rod is
If R is radius of the planet and g is the acceleration due to gravity at its surface then the body will reach the centre of the planet in time
A bullet of mass 0.01$\mathrm { kg }$ and traveling at a speed of 500$\mathrm { m } / \mathrm { sec }$ strikes a block of which suspended by a string of length 5$\mathrm { m }$ . The centre of gravity of the block is found to vertical distance of 0.1$\mathrm { m }$ . What is the speed of the bullet after it emerges from the block?
A metallic rod falls under gravity with its ends pointing east and west. Then
The apparent weight of a person of mass m in an elevator is 2mg. The elevator is moving
A body of mass 5 kg initially moving with speed 10 m/s along x-axis in gravity free space explodes and breaks into three pieces of masses 1 kg, 1 kg and 3 kg. the two pieces of equal masses fly off with the same speed 20 m/s along y-axis and z-axis respectively. what is the velocity of heavier fragment?
AU the particles of a system are situated at a distance r from the origin. The distance of the centre of mass of the system from the origin is :
The position vector of three particles of masses $m _1\, =\,1kg,\, m _2\, =\, 2\, kg$ and $m _3\, =\, 3\, kg$ are $\vec{r} _1\, =\, (\hat{i}\, +\, 4\hat{j}\, +\, \hat{k})\, m,\, \vec{r} _2\, =\, (\hat{i}\, +\, \hat{j}\, +\, \hat{k}) m$ and $\vec{r} _3\, =\, (2\hat{i}\, -\, \hat{j}\, -\, 2\hat{k})$ m respectively. Find the position vector of their center of mass.
At which point is the centre of gravity situated in: A circular lamina.
What is the position of centre of gravity of a rectangular lamina?
At which point is the centre of gravity situated in: A triangular lamina
A body of mass 2 $ \mathrm{kg} $ is thrown up vertically with $ \mathrm{K.E.} $ of 490 Joules. If the acceleration due to gravity is 9.8 $ \mathrm{m} / \mathrm{s}^{2} $ , then the height at which the K.E. of the body becomes half its originalvalue is given by
People can spin a ball on their finger. This is due to
If we suspend lamina at different positions, its center of gravity will still lie along the :
Which of following statements related to center of gravity is/are false?
An object will not undergo rotational motion when:
Two particles having mass ratio $n : 1$ are interconnected by a light in extensible string that passes over a smooth pulley. If the system is released, then the acceleration of the centre of mass of the system is :
The centre of gravity of the floating ship.
A body weighs 250 N on the surface of the earth. How much will it weigh half way down to the centre of the earth.?
Two planets have radii $r _1$ and $r _2$ and their densities are $\rho _1$ and $\rho _2$, respectively. The ratio of acceleration due to gravity on them will be.
An object after deforming
Racing car can corner rapidly without turning due to
Distance covered by a freely falling body in 5 seconds is
A man can jump 1.5m high on the earth. Calculate the approximate height he might be able to jump on a planet whose density is one-quarter that of the earth and whose radius is one-third of the earth's radius.
Which among the following is the major cause of nutation in Earth's axis:
The mean radius of the earth is $R$, its angular speed about its own axis $\omega$ and the acceleration due to gravity at the earth surface is $g$. The cube of radius of orbit of 'geostationary satellite' will be
Instrument used for determining specific gravity is
For a ball falling in a iiquid with constant velocity, ratio of resistance force due to the liquid to that due to gravity is
If a charge particle projected in a gravity-free room it does not deflect,
If the earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take:
Weight $W _ { m }$ of the body can be given as
Why are the passengers in the upper deck of a double-decker bus not allowed to stand?