हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान कक्षा ११

The Work Done by the External Forces on a System Equals the Change in

Advertisements
Advertisements

प्रश्न

The work done by the external forces on a system equals the change in

विकल्प

  •  total energy

  • kinetic energy

  •  potential energy

  • none of these

MCQ
Advertisements

उत्तर

total energy
When work is done by an external forces on a system, the total energy of the system will change.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 8: Work and Energy - MCQ [पृष्ठ १३१]

APPEARS IN

एचसी वर्मा Concepts of Physics Volume 1 and 2 [English]
अध्याय 8 Work and Energy
MCQ | Q 5 | पृष्ठ १३१

संबंधित प्रश्न

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


Suppose the magnitude of Nuclear force between two protons varies with the distance between them as shown in figure. Estimate the ratio "Nuclear force/Coulomb force" for
(a) x = 8 fm
(b) x = 4 fm
(c) x = 2 fm
(d) x = 1 fm (1 fm = 10 −15m).


List all the forces acting on the block B in figure.


Figure shows a boy pulling a wagon on a road. List as many forces as you can which are relevant with this figure. Find the pairs of forces connected by Newton's third law of motion.


Figure shows a cart. Complete the table shown below.

Force on Force by Nature of the Force Direction
Cart

1
2
3
:

   
Horse

1
2
3
:

   
Driver

1
2
3
:

   

When Neils Bohr shook hand with Werner Heisenberg, what kind of force they exerted ?


A 60 kg man pushes a 40 kg man by a force of 60 N. The 40 kg man has pushed the other man with a force of


A neutron exerts a force on a proton which is

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


The gravitational force acting on a particle of 1 g due to a similar particle is equal to 6.67 × 10−17 N. Calculate the separation between the particles.


The average separation between the proton and the electron in a hydrogen atom in ground state is 5.3 × 10−11 m. (a) Calculate the Coulomb force between them at this separation. (b) When the atom goes into its first excited state the average separation between the proton and the electron increases to four times its value in the ground state. What is the Coulomb force in this state?


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

 

A block of weight 100 N is slowly moved up a smooth incline of inclination 37° by a person. Calculate the work done by the person in moving the block through a distance of 2 m, if the driving force is (a) parallel to the incline and (b) in the horizontal direction.

 

A block of mass 2 kg kept at rest on an inclined plane of inclination 37° is pulled up the plane by applying a constant force of 20 N parallel to the incline. The force acts for one second.  Show that the work done by the applied force does not exceed 40 J.


A block of mass 2 kg kept at rest on an inclined plane of inclination 37° is pulled up the plane by applying a constant force of 20 N parallel to the incline. The force acts for one second.  Find the kinetic energy of the block at the instant the force ceases to act. Take g = 10 m/s2.


In a children's park, there is a slide which has a total length of 10 m and a height of 8⋅0 m . A vertical ladder is provided to reach the top. A boy weighing 200 N climbs up the ladder to the top of the slide and slides down to the ground. The average friction offered by the slide is three tenth of his weight. Find (a) the work done by the ladder on the boy as he goes up; (b) the work done by the slide on the boy as he comes down. Neglect any work done by forces inside the body of the boy


A uniform chain of length L and mass M overhangs a horizontal table with its two third part on the table. The friction coefficient between the table and the chain is μ . Find the work done by friction during the period the chain slips off the table.

 

The work done by an applied variable force, F = x + x3 from x = 0 m to x = 2m, where x is displacement, is:


Work done by gas in cyclic process is ______ J.


A cylinder of area 300 cm2 and length 10 cm made of material of specific gravity 0.8 is floated in water with its axis vertical. It is then pushed downward, so as to be just immersed. The work done by the agent who pushes the cylinder into the water is ______ J.


Force acting on a particle is (2`hat"i"` + 3 `hat"j"`) N. Work done by this force is zero, when a particle is moved on the line 3y + kx = 5. Here value of k is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×