9394949438

[LATEST]$type=sticky$show=home$rm=0$va=0$count=4$va=0




WORK ENERGY AND POWER Quiz-10

Dear Readers,

Work power energy is the most important chapter when it comes to mechanics, for JEE (Advanced). The chapter is quite tricky and takes a lot of time and devotion on your part to understand and master. But this chapter is a complete gold medal for almost all the questions of the mechanics can be solved by the work power energy approach if you master this topic..

Q1.
  •  Block C will move for a very small duration
  •  Block A will move for a very small duration
  •  Block B will acquire maximum speed when C is at the lowest point on B and moving towards left
  •  Block B will acquire maximum speed when C is at the topmost point of B
Solution
When block C is released from rest, it sides down on A, pushing it against the wall (because of a component of normal force between A and C), as on left of A a wall is there, it does not move. The kinetic energy of block C incrases and it becomes mgh when it is just going to pass on B When block C comes in contact with B, sue to horizontal component of normal force between C and B,B starts moving towards right and kinetic energy of C gets converted into kinetic energy of B and potential energy of C, so block C is not able to reach the topmost point of B. Then block C starts sliding down B, but velocity of B will still be increasing and becomes maximum when C reaches its bottom-most point and is moving left


Q2.
  •  1/2 kx^2
  •  1/2 (kx)(s+x)
  •  1/2 kxs
  •  1/2 kx(s+x+s)
Solution
Total work done is equal to the energy stored in the spring


Q3.  
A mass M is lowered with the help of a string by a distance h at a constant acceleration g/2. The work done by the string will be
  •  Mgh/2
  •  -Mgh/2
  •  3Mgh/2
  •  -3Mgh/2
Solution

Q4. 
  •  R[2+1/(2√2)]
  •  [1+1/(2√2)]R
  •  3R
  •  None of these
Solution


Q5.
  •  mg/(4k)
  •  4mg/k
  •  mg/(2k)
  •  None
Solution
 


Q6. 
A weightlifter lifts a weight off the ground and holds it up, then
  •  Work is done in lifting as well as holding the weight
  •   No work is done in both lifting and holding the weight
  • Work is done in lifting the weight but no work is required to be done in holding it up
  •  No work is done in lifting the weight but work is required to be done in holding it up
Solution
When a weightlifter lifts a weight by height h (say), then work done by the lifting force F W1=RFs cos⁡ 0°=+Fh But work done in holding it up is zero because the displacement is zero


Q7.
Water is drawn from a well in a 5 kg drum of capacity 55 L by two ropes connected to the top of the drum. The linear mass density of each rope is 0.5 kgm^(-1). The work done in lifting water to the ground from the surfaces of water in the well 20 m below is [g=10 ms^(-2)]
  •  1.4×10^4 J
  •  1.5×10^4 J
  •  9.8×10^6 J
  •  18 J
Solution
Work done in lifting water and drum is 60×10×20 J=12000 J
Total mass of ropes =40×0.5 kg=20 kg
Work done in the case of ropes is 20×10×10=2000 J
Total work done=14000 J


Q8.
Which of the following statements is correct?
  •  Kinetic energy of a system can be changed without changing its momentum
  •  Kinetic energy of a system cannot be changed without changing its momentum
  •  Momentum of a system cannot be changed without changing its kinetic energy
  •  A system cannot have energy without having momentum
Solution
In the explosion of a bomb or inelastic collision between two bodies as force is internal, momentum is conserved while KE changes. Hence, the KE of a system can be changed without changing its momentum. Similarly, the reverse is also true, e.g., if a force acts perpendicular to motion, work done will be zero and so KE will remain constant. However, the force will change the direction of motion and so the momentum. Further, body may have energy (i.e., potential energy without having momentum)


Q9. 
  •  Increase with θ
  •  Decrease with θ
  •  Remain constant
  •  First increase with θ and then decrease
Solution


Q10. 
In a tug of war, both the teams A and B remain in equilibrium, then

  •  Work done by team A is positive
  •  Work done by team B is positive
  •  Work done by both the teams is negative
  • Work done by both the teams is zero
Solution
Because both the teams balance each other, displacement is zero. Therefore, work done is also zero

author image

Written by: AUTHORNAME

AUTHORDESCRIPTION

Want to know more

Please fill in the details below:

INNER POST ADS

Latest IITJEE Articles$type=three$c=3$author=hide$comment=hide$rm=hide$date=hide$snippet=hide

Latest NEET Articles$type=three$c=3$author=hide$comment=hide$rm=hide$date=hide$snippet=hide

Name

Admissions,1,Alternating Current,60,AP EAMCET 2020,1,Basic Maths,2,BCECE 2020,1,best books for iit jee,2,best coaching institute for iit,1,best coaching institute for iit jee preparation,1,best iit jee coaching delhi,1,best iit jee coaching in delhi,2,best study material for iit jee,4,BITSAT Registration 2020,1,Blog,62,books for jee preparation,1,books recommended by iit toppers,3,Capacitance,3,CBSE,1,CBSE accounts exam,1,CBSE boards,1,CBSE NEET,9,cbse neet 2019,3,CBSE NEET 2020,1,cbse neet nic,1,Centre of Mass,2,Chemistry,58,Class 12 Physics,15,coaching for jee advanced,1,coaching institute for iit jee,2,Collision,2,COMEDK UGET 2020 Application Form,1,COMEDK UGET 2020 Exam Form,1,COMEDK UGET news,1,CUCET 2020,2,Current Electricity,4,CVR college,1,Electromagnetic Induction,3,Electronics,1,Electrostatics,3,Energy,1,Engineering & Medical,1,Fluid Mechanics,4,Gravitation,2,GUJCET 2020 Application Form,1,Heat,4,iit admission,1,iit advanced,1,iit coaching centre,3,iit coaching centre in delhi,2,iit coaching classes,2,iit coaching in delhi,1,iit coaching institute in delhi,1,iit entrance exam,1,iit entrance exam syllabus,2,iit exam pattern,2,iit jee,5,iit jee 2019,3,iit jee advanced,2,iit jee books,3,iit jee coaching,2,iit jee exam,3,iit jee exam 2019,1,iit jee exam pattern,3,iit jee institute,1,iit jee main 2019,2,iit jee mains,3,iit jee mains syllabus,2,iit jee material,1,iit jee online test,3,iit jee practice test,3,iit jee preparation,6,iit jee preparation in delhi,2,iit jee preparation time,1,iit jee preparation tips by toppers,2,iit jee question paper,1,iit jee study material,3,iit jee study materials,2,iit jee syllabus,2,iit jee syllabus 2019,2,iit jee test,3,iit preparation,2,iit preparation books,5,iit preparation time table,2,iit preparation tips,2,iit syllabus,2,iit test series,3,IITJEE,100,IPU CET,1,JEE Advanced,83,jee advanced exam,2,jee advanced exam pattern,1,jee advanced paper,1,JEE Books,1,JEE Coaching Delhi,3,jee exam,3,jee exam 2019,6,JEE Exam Pattern,2,jee exam pattern 2019,1,jee exam preparation,1,JEE Main,85,jee main 2019,4,JEE Main 2020,1,JEE Main 2020 Application Form,2,JEE Main 2020 news,2,JEE Main 2020 Official Answer Key,1,JEE Main 2020 Registration,1,JEE Main 2020 Score,1,JEE Main application form,1,jee main coaching,1,JEE Main eligibility criteria,3,jee main exam,1,jee main exam 2019,3,jee main online question paper,1,jee main online test,3,JEE Main Paper-2 Result,1,jee main registration,2,jee main syllabus,2,JEE mains 2020,1,jee mains question bank,1,jee mains test papers,3,JEE Mock Test,2,jee notes,1,jee past papers,1,JEE Preparation,2,jee preparation in delhi,1,jee preparation material,4,JEE Study Material,1,jee syllabus,6,JEE Syllabus Chemistry,1,JEE Syllabus Maths,1,JEE Syllabus Physics,1,jee test series,3,KCET - 2020,1,Kinematics,1,Latest article,5,Latest Articles,61,Latest News,34,latest news about neet exam,1,Laws of Motion,2,Magnetic Effect of Current,3,Magnetism,3,MHT CET 2020,2,MHT CET 2020 exam schedule,1,Modern Physics,1,NCERT Solutions,15,neet,3,neet 2019,1,neet 2019 eligibility criteria,1,neet 2019 exam date,2,neet 2019 test series,2,NEET 2020,2,NEET 2020 Application Form,1,NEET 2020 Eligibility Criteria,1,NEET 2020 Registration,1,neet application form,1,neet application form 2019 last date,1,Neet Biology Syllabus,1,Neet Books,3,neet eligibility criteria,3,neet exam 2019,7,neet exam application,1,neet exam date,1,neet exam details,1,neet exam pattern,6,neet exam pattern 2019,2,neet examination,1,neet mock test 2019,1,Neet Notes,3,Neet Online Application Form,3,neet online test,2,neet past papers,1,neet physics syllabus,1,neet practice test,2,NEET preparation books,1,neet qualification marks,1,NEET question paper 2019,1,neet question papers,1,neet registration,1,Neet Study Material,3,neet syllabus,6,neet syllabus 2019,5,NEET Syllabus 2020,1,neet syllabus chemistry,1,neet syllabus for biology,1,neet syllabus for physics,1,neet test series,1,neet ug 2019,2,news,5,online study material for iit jee,1,Optical Instruments,1,Physics,110,physics books for iit jee,1,Power,1,Practical Physics,1,Quiz,5,Ray Optics,1,Rotational Motion,3,SHM,3,Simple Harmonic Motion,3,study materials for iit jee,1,Study Notes,110,study notes for iit jee,1,Thermodynamics,4,TS EAMCET Notification,2,Units and Dimensions,1,UPSEE 2020,1,UPSEE 2020 Application Form,2,UPSEE EXAM,1,Vectors,2,VITEE Application form,1,Wave Motion,3,Wave Optics,1,WBJEE 2020 Admit Card,1,WBJEE 2020 Answer Key,1,Work,1,
ltr
item
BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE: Work Energy and Power-Quiz-10
Work Energy and Power-Quiz-10
https://1.bp.blogspot.com/-K3cKQNhsVBc/YOccYNxa5uI/AAAAAAAAUtk/6pDukDaJqzAK6NtRi-QhahFz3wJwcZL6ACLcBGAsYHQ/s320/Quiz%2BImage%2B20%2B%252810%2529.jpg
https://1.bp.blogspot.com/-K3cKQNhsVBc/YOccYNxa5uI/AAAAAAAAUtk/6pDukDaJqzAK6NtRi-QhahFz3wJwcZL6ACLcBGAsYHQ/s72-c/Quiz%2BImage%2B20%2B%252810%2529.jpg
BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE
https://www.cleariitmedical.com/2021/07/work-energy-and-power-quiz-10.html
https://www.cleariitmedical.com/
https://www.cleariitmedical.com/
https://www.cleariitmedical.com/2021/07/work-energy-and-power-quiz-10.html
true
7783647550433378923
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy