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Recent questions tagged power and energy
+2
votes
1
answer
In a hydro-electric generating station, the mean head (i.e. the difference of height between the mean level of the water
asked
Apr 7, 2019
in
Class 9
by
kratos
work
class-9
power and energy
+2
votes
1
answer
A man weighing 700N runs up a flight of 15 steps, each 20cm high, in 5 seconds. Calculate the power of the man.
asked
Mar 27, 2019
in
JEE
by
kratos
work
jee
energy and power
class-9
class-10
icse
force
jee mains
power and energy
+3
votes
1
answer
The power of a motor pump is 2 kw.How much water per minute the pump can raise to a height of 10m?(GIVEN G=10m/*)
asked
Mar 10, 2019
in
Class 12
by
kratos
work
neet
cbse
work energy and power
work and energy
thermodynamics
power and energy
+1
vote
1
answer
An electric hoist makes 10 double journey per hour. In each journey, a load of 6 tonnes is raised to a height of 60 meters in 90 seconds.
asked
Mar 8, 2019
in
Class 9
by
kratos
work
class-9
power and energy
+2
votes
1
answer
A boy of mass 40 kg runs up a flight of 15 steps each 15 cm high in 10 *. Find: (i) the work done and
asked
Mar 5, 2019
in
Class 10
by
kratos
work
work energy and power
energy and power
class-9
class-10
icse
force
power and energy
+1
vote
1
answer
One kg of water, at 20C, heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of 20 Ω.
asked
Feb 23, 2019
in
JEE
by
kratos
work
electric current
jee
jee mains 2019
jee mains
power and energy
+1
vote
1
answer
The work done by gravity force mg on the block. (A) depends upon the height h
asked
Feb 22, 2019
in
Class 11
by
kratos
work
work energy and power
class-11
energy and power
thermodynamics
class-9
class-10
icse
power and energy
bitsat
+1
vote
1
answer
A coil takes 15 minutes to boil certain amount of water, another coil takes 20 minutes for the same process Time taken to boil the
asked
Feb 14, 2019
in
Class 12
by
kratos
work
neet
current electricity
aiims
power and energy
+3
votes
1
answer
Assertion : In a free fall, weight of a body becomes effectively zero.
asked
Feb 3, 2019
in
JEE
by
kratos
work
cbse
jee
aiims
biomolecules
class-9
class-12
icse
class-10
jee mains
gravitation
power and energy
+1
vote
1
answer
Define work . when is work said to be done by a force?
asked
Jan 31, 2019
in
JEE
by
kratos
power and energy
reported speech
indirect
surface tension
energy
work
jee mains
simple machines
class-8
icse
class-6
jee
class-9
+2
votes
1
answer
Work done during raising a box on to a platform (1) depends upon how fast it is raised
asked
Jan 31, 2019
in
Class 11
by
kratos
work
class-11
energy and power
class-9
power and energy
bitsat
+1
vote
1
answer
When 100 g of a liquid A at 100C is added to 50 g of a liquid B at temperature 75C,
asked
Jan 25, 2019
in
Class 12
by
kratos
work
neet
jee
aiims
jee mains 2019
aiims 2019
jee mains
gaseous state
power and energy
+2
votes
1
answer
The kinetic energy of the body in the above question after 3 seconds will be.
asked
Jan 22, 2019
in
Class 12
by
kratos
amu
work
neet
motion in a straight line
class-11
aiims
jee
class-9
jee mains
uniform motion
power and energy
+3
votes
1
answer
Two heater A and B are in parallel across supply voltage V. Heater A produces 500 kcal in 200 min.
asked
Jan 20, 2019
in
Class 11
by
kratos
work
class-9
class-11
power and energy
+1
vote
1
answer
The heater element of an electric kettle has a constant resistance of 100 Ω and the applied voltage is 250 V.
asked
Jan 18, 2019
in
Class 9
by
kratos
work
class-9
power and energy
+1
vote
1
answer
When a force retards the motion of a body, what is the nature of work done by the force? State reason. List two examples of such a situation
asked
Jan 17, 2019
in
Class 9
by
kratos
work
cbse
work and energy
class-9
power and energy
+1
vote
1
answer
An electrical lift make 12 double journey per hour. A load of 5 tonnes is raised by it through a height 50 m and it returns empty.
asked
Jan 14, 2019
in
Class 9
by
kratos
work
class-9
power and energy
+3
votes
1
answer
A ****** does no work against the force of gravity while carrying a luggage on a road.
asked
Dec 26, 2018
in
Class 11
by
kratos
work
class- 11
cbse
class-8
work energy and power
energy
class-11
class-9
icse
power
power and energy
+2
votes
1
answer
The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
asked
Dec 25, 2018
in
Class 9
by
kratos
work
cbse
work and energy
class-9
power and energy
+1
vote
1
answer
Explain the law of conservation of energy.
asked
Dec 23, 2018
in
Physics
by
kratos
work
power and energy
class-11
class-9
class-10
class-12
current electricity
nuclear physics
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