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प्रश्न
Find the odd man out:
पर्याय
Force responsible for a string to become taut on stretching
Weight of an object
The force due to which we can hold an object in hand.
उत्तर
Force responsible for a string to become taut on stretching, Weight of an object, The force due to which we can hold an object in hand - Weight of an object.
Reason: Weight of an object (force due to gravity) is a non-contact force while force responsible for a string to become taut (tension force) and force due to which we can hold an object in hand (normal force) are contact forces
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संबंधित प्रश्न
Answer the following question.
In the following table, every entry on the left column can match with any number of entries on the right side. Pick up all those and write respectively against A, B, C and D.
| Name of the force | Type of the force | ||
| A | Force due to tension in a string | P | EM force |
| B | Normal force | Q | Reaction force |
| C | Frictional force | R | Conservative force |
| D | Resistive force offered by air or water for objects moving through it. | S | Non-conservative force |
Among the four fundamental forces, only one force governs your daily life almost entirely. Justify the statement by stating that force.
Answer the following question.
You are sitting next to your friend on ground. Is there any gravitational force of attraction between you two? If so, why are you not coming together naturally? Is any force other than the gravitational force of the earth coming in the picture?
Answer the following question.
Distinguish between conservative and nonconservative forces.
Answer the following question.
State the formula for calculating work done by a force. Are there any conditions or limitations in using it directly? If so, state those clearly. Is there any mathematical way out for it? Explain.
Solve the following problem.
As I was standing on a weighing machine inside a lift it recorded 50 kg wt. Suddenly for a few seconds, it recorded 45 kg wt. What must have happened during that time? Explain with complete numerical analysis.
Solve the following problem.
Derive the expression for power in terms of F, m, and t.
Solve the following problem.
While decreasing linearly from 5 N to 3 N, a force displaces an object from 3 m to 5 m. Calculate the work done by this force during this displacement.
Solve the following problem.
In the following table, every item on the left side can match with any number of items on the right-hand side. Select all those.
| Types of collision | Illustrations | ||
| a. | Elastic collision | i. | A ball hit by a bat. |
| b. | Inelastic collision | ii. | Molecular collisions responsible for pressure exerted by a gas. |
| c. | Perfectly inelastic collision | iii. | A stationary marble A is hit by marble B and the marble B comes to rest. |
| d. | Head-on collision | iv. | A blob of clay dropped on the ground sticks to the ground. |
| v. | Out of anger, giving a kick to a wall. | ||
| vi. | A striker hits the boundary of a carrom board in a direction perpendicular to the boundary and rebounds. | ||
Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be ______
If W1, W2 and W3 represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 (as shown in fig) in the gravitational field of the point mass 'm'. Find the correct relation between W1, W2 and W3.
In air, a charged soap bubble of radius 'R' breaks into 27 small soap bubbles of equal radius 'r '. Then the ratio of mechanical force acting per unit area of big soap bubble to that of a small soap bubble is ______.
A body of mass 'm' begins to move under the action of time-dependent force `vec"F" = ("t"hat"i" + 2"t"^2hat"j")`N where `hat"i" and hat"j"` are unit vectors along x and y axis respectively. The power developed by the force in watt at time 't' is ______.
A force F = (10 + 0.5 x) N acts on a particle in the x-direction. The work done by the force in displacing the particle from x = 0 to x = 2 metre is ______.
Work done in sliding a 1 kg block up a rough inclined plane of height 5 m is 100 J. Work done against the friction is ______.
(g = 10 m/s2)
A Diwali cracker releases 25 gram gas per second, with a speed of 400 ms-1 after explosion. The force exerted by gas on the cracker is ______.
'n' number of balls each having mass 'm' and velocity 'u' hit a wall elastically and normally in 2 seconds. The force exerted by them on the wall is ______.
Out of the fundamental forces in nature, maximum and minimum range is respectively for ______.
A force F acting on an object varies with distance x as shown here. The force is in N and x in m. The work done by the force in moving the object from x = 0 to x = 6 m is ______.
Two rods of same length and transfer a given amount of heat 12 second, when they are joined as shown in figure (i), But when they are joined as shown in figure (ii), then they will transfer same heat in same conditions in ______.
A gardener pushes a lawn roller through a distance of 20 m. If he applies a force of 30 kg-wt in a direction inclined at 60° to the ground, the work done by the gardener in pushing the roller is ______.
`["g" = 9.8 "m""/""s"^2, sin30^circ = cos60^circ = 1/2, cos30^circ = sin60^circ = sqrt3/2]`
Which of the following statements is correct?
A uniform beam is balanced at its mid-point an object placed on the beam as shown.
Which force will rebalance the beam?
