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When You Hold a Pen and Write on Your Notebook, What Kind of Force is Exerted by You on the Pen? by the Pen on the Notebook? by You on the Notebook? - Physics

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प्रश्न

When you hold a pen and write on your notebook, what kind of force is exerted by you on the pen? By the pen on the notebook? By you on the notebook?

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उत्तर

When we hold a pen and write on our notebook, we are exerting electromagnetic force on the pen. The pen is also exerting the same force on the notebook. We are also exerting gravitational force on the notebook.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: The Forces - Short Answers [पृष्ठ ६१]

APPEARS IN

एचसी वर्मा Concepts of Physics Vol. 1 [English] Class 11 and 12
पाठ 4 The Forces
Short Answers | Q 4 | पृष्ठ ६१

संबंधित प्रश्‍न

A body constrained to move along the z-axis of a coordinate system is subject to a constant force F given by

`F = -hati+2hatj+3hatkN`

Where `hati,hatj,hatk` are unit vectors along the x-, y- and z-axis of the system respectively. What is the work done by this force in moving the body a distance of 4 m along the z-axis ?


A lawyer alleges in court that the police had forced his client to issue a statement of confession. What kind of force is this ?


Is it true that the reaction of a gravitational force is always gravitational, of an electromagnetic force is always electromagnetic and so on?


A neutron exerts a force on a proton which is

(a) gravitational
(b) electromagnetic
(c) nuclear
(d) weak


Which of the following systems may be adequately described by classical physics ?

(a) motion of a cricket ball
(b) motion of a dust particle
(c) a hydrogen atom
(d) a neutron changing to a proton.


Calculate the force with which you attract the earth.


The magnetic force on a charged particle is always perpendicular to its velocity. Can the magnetic force change the velocity of the particles? Speed of the particle?

 

A block of mass m slides down a smooth vertical circular track. During the motion, the block is in  


A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the plane. The motion of the particle takes place in a plane. It follows that

(a) its velocity is constant
(b) its acceleration is constant
(c) its kinetic energy is constant
(d) it moves in a circular path.


No work is done by a force on an object if

(a) the force is always perpendicular to its velocity
(b) the force is always perpendicular to its acceleration
(c) the object is stationary but the point of application of the force moves on the object
(d) the object moves in such a way that the point of application of the force remains fixed.


A box is pushed through 4.0 m across a floor offering 100 N resistance. How much work is done by the resisting force?

 

Find the average force needed to accelerate a car weighing 500 kg from rest to 72 km/h through a distance of 25 m.


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A uniform chain of mass m and length l overhangs a table with its two third part on the table. Find the work to be done by a person to put the hanging part back on the table.

 

A body of mass 0.5 kg travels in a straight line with velocity v = a x3/2 where a = 5 m–1/2s–1. The work done by the net force during its displacement from x = 0 to x = 2 m is ______.


A body is being raised to a height h from the surface of earth. What is the sign of work done by gravitational force?


A block of mass m is taken from A to B slowly under the action of a constant force R Work done by this force is ______.


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