Advertisements
Advertisements
Question
Among the four fundamental forces, only one force governs your daily life almost entirely. Justify the statement by stating that force.
Solution
- The electromagnetic force is the attractive and repulsive force between electrically charged particles.
- Since electromagnetic force is much stronger than the gravitational force, it dominates all the phenomena on atomic and molecular scales.
- The majority of the forces experienced in our daily life like friction, normal reaction, the tension in strings, elastic forces, viscosity, etc. are electromagnetic in nature.
- The structure of atoms and molecules, the dynamics of chemical reactions etc. are governed by electromagnetic forces.
Thus, out of the four fundamental forces, the electromagnetic force governs our daily life almost entirely.
APPEARS IN
RELATED QUESTIONS
Answer the following question.
Distinguish between real and pseudo force.
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.
Derive the expression for power in terms of F, m, and t.
Solve the following problem.
Two galaxies of masses 9 billion solar mass and 4 billion solar mass are 5 million light-years apart. If, the Sun has to cross the line joining them, without being attracted by either of them, through what point it should pass?
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 bodies A and B of equal mass are suspended from two separate massles springs of force constant k1 and k2, respectively. The bodies oscillate vertically such that their maximum velocities are equal. The ratio of the amplitudes of body A to that of body B is ______.
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.
Which of the following is the correct order of forces?
Two particles of mass m1 and m2, approach each other due to their mutual gravitational attraction only. Then ______.
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 of F = `("x"/2 + 15) "N"` acts on a particle. If x 2 is in metre, calculate the work done by the force during the displacement of the particle from x = 0 to x = 4 m
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 ______.
'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?
