Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
studyplans
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
mobile
exams
ask
sample papers
teach
pricing
sign-in
Download our FREE mobile app with 1000+ tests for CBSE, JEE MAIN, AIPMT
X
Search
Topics
Want to ask us a question?
Click here
Browse Questions
Student Questions
Ad
Home
>>
JEEMAIN and AIPMT
>>
Physics
>>
Class11
>>
Work, Power and Energy
0
votes
If the unit of force and length each increased by 4 times , then the unit of energy is increased by
\[(a)\;16 \;times \quad (b)\;8\;times\quad (c)\;2\;times \quad (d)\;4\; times\]
jeemain
physics
class11
ch6
work
work-energy-theorem
work-power-energy
q18
easy
dimensional-formulae-and-analysis
units-and-measurements
Share
asked
Jul 18, 2013
by
meena.p
retagged
Aug 25, 2014
by
balaji.thirumalai
Please
log in
or
register
to add a comment.
Can you answer this question?
Do not ask me again to answer questions
Please
log in
or
register
to answer this question.
1 Answer
0
votes
Answer: 16 times.
Dimensionally, Force is represented as $ [MLT^{-2}]$ and Length as $[L]$.
$\Rightarrow$ Energy $ = F\;d$ is represented as $ [MLT^{-2}] \times [L] = [ML^2T^{-2}]$.
Therefore, if Force and length are quadrupled in value, Energy $ = 4[MLT^{-2}] \times 4[L] = 16[ML^2T^{-2}]$.
$\Rightarrow$ the unit of energy increased 16 times.
answered
Jul 18, 2013
by
meena.p
edited
Aug 25, 2014
by
balaji.thirumalai
Please
log in
or
register
to add a comment.
Related questions
0
votes
1
answer
Displacement of a body of mass 2 kg varies with time as $s=t^2+2t$.Where s in meters t in seconds. The work done by the force acting an body during the time t=2s to t=4s is
asked
Jul 17, 2013
by
meena.p
jeemain
physics
class11
ch6
work-power-energy
q5
work
kinetic-energy
easy
work-energy-theorem
variable-force
0
votes
1
answer
An object of mass 1 kg travelling at 5.0 m/s enters a region of ice where the coefficient of kinetic friction is .10. Find the distance the object travels before coming to rest.
asked
Jul 17, 2013
by
meena.p
jeemain
physics
class11
ch6
work
work-energy-theorem
work-power-energy
q13
easy
0
votes
1
answer
It is well known that a raindrop falls under the influence of the downward gravitational force and the opposing resistive force. The latter is known to be proportional to the speed of the drop but is otherwise undetermined. Consider a drop of mass 1.00 g falling from a height 1.00 km. It hits the ground with a speed of $50.0 m s^{-1}$.What is the work done by the unknown resistive force?
asked
Aug 28, 2014
by
sreemathi.v
jeemain
physics
class11
work-power-energy
ch6
work-energy-theorem
easy
0
votes
1
answer
It is well known that a raindrop falls under the influence of the downward gravitational force and the opposing resistive force. The latter is known to be proportional to the speed of the drop but is otherwise undetermined. Consider a drop of mass 1.00 g falling from a height 1.00 km. It hits the ground with a speed of $50.0 m s^{-1}$.What is the work done by the gravitational force
asked
Aug 28, 2014
by
sreemathi.v
jeemain
physics
class11
work-power-energy
ch6
work-energy-theorem
easy
0
votes
1
answer
Which of the following is true, if no work is done by a force on an object?
asked
Aug 25, 2014
by
balaji.thirumalai
jeemain
physics
class11
work-power-energy
ch6
work
work-done-by-a-constant-force
easy
0
votes
1
answer
A force of 0.5 N acts on body of mass 5 kg initially at rest for one minute. Find the work done by the force.
asked
Jul 17, 2013
by
meena.p
jeemain
physics
class11
ch6
work
work-power-energy
q6
easy
0
votes
1
answer
Work done by force $F=(-6x^3\hat i)\;N$ in displaying particle from $x=4m$ to $x=-2m$ is
asked
Jul 16, 2013
by
meena.p
jeemain
physics
class11
work-power-energy
ch6
work
work-done-by-a-variable-force
easy
Ask Question
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
AIPMT Crash Practice
5 Test Series
JEEMAIN
350+ TESTS
AIPMT
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
x
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...