हिंदी

Among the four fundamental forces, only one force governs your daily life almost entirely. Justify the statement by stating that force. - Physics

Advertisements
Advertisements

प्रश्न

Among the four fundamental forces, only one force governs your daily life almost entirely. Justify the statement by stating that force.

औचित्य

उत्तर

  1. The electromagnetic force is the attractive and repulsive force between electrically charged particles.
  2. Since electromagnetic force is much stronger than the gravitational force, it dominates all the phenomena on atomic and molecular scales.
  3. 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.
  4. 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.
shaalaa.com
Types of Forces
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 4: Laws of Motion - Exercises [पृष्ठ ७५]

APPEARS IN

बालभारती Physics [English] 11 Standard Maharashtra State Board
अध्याय 4 Laws of Motion
Exercises | Q 2. (vi) | पृष्ठ ७५

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

Find the odd man out:


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 contact and non-contact forces


40000 litre of oil of density 0.9 g/cc is pumped from an oil tanker ship into a storage tank at 10 m higher level than the ship in half an hour. What should be the power of the pump?


Solve the following problem.

Power is the rate of doing work or the rate at which energy is supplied to the system. A constant force F is applied to a body of mass m. Power delivered by the force at time t from the start is proportional to ______.

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?


Variation of a force in a certain region is given by F = 6x2 – 4x – 8. It displaces an object from x = 1 m to x = 2 m in this region. Calculate the amount of work done.


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 ______


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.


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 ______.


What is the amount of work done by a person when

  1. he holds a mass of 2 kg for 5 second and
  2. he lifts the same mass through 1 meter to keep it on the top of a table? g = 9.8 m/s2

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 ______.


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 ______.


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 ______.


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?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×