Work energy power full lesson Flashcards
when is work done ?
work is said to be done when the force applied on a body makes the body move
is displacement is 0 , then work is?
zero
while standing with a heavy load does a coolie do work ?
no , since displacement is 0
amount of work on a body depends on ? [ two factors ]
magnitude and displacement
work formula
F*S = WORK
Work formula on basis of cos
w = f*Scos
when the displacement is normal to the direction of work ? what will happen to work?
work will be zero
w = _____, on basis of mass , gravity and height
w=mgh
for calculating height for the stairs ? the formula is?
h = number of stairs * height of each stairs
unit of work =_____
joule
1 joule = _____ * __________
1 joule = 1newton * 1 metre
1 kj =____
1 kj =10^3
1 mj =
10^6 j
1 gj =
10^9 j
c.g.s unit of work
erg
1 erg = ______ * ________
1 dyne * 1 cm
1 joule = ______ erg
10^7 erg
work is ______ quantity scalar or vector
scalar
power = _________ [formula]
w/t
power is _______ quantity
scalar
power depend on 2 factors
amount of work done and time taken for it
power formula on basis of average speed
p = f*v
unit of power =
watt
1 watt = _____ / ______
1joule / 1 sec
1kw = ___
10^3 watt
1 mw =
10^6 watt
1 gw=
10^9 watt
1milliwatt =
10 ^ -3
1 micro watt =
10^-6
c.g.s unit of power =
erg/sec
1 watt = _____erg/s^1
10^7
1 H.P =___
746 w
Energy is a ______ quantity
scalar
there is no transfer of energy when _____
force is acted upon the direction of displacement
1 watt hr =________ kj
3.6 kj = 3600 j
1kwh = ______ MJ
3.6 MJ
1 KWH = _____J
3.6 * 10^6 J
POWER * TIME =
ENERGY
HEAT ENERGY IS MEASURED IN _____
CALORIE
1 CALORIE IS REQUIRED TO RAISE TEMP OF _______G water FROM _____ TO ______ *C
1G OF WATER FROM 14.5 TO 15.5
1 J =_____ CALORIE
0.24
1 CALOIRE =______J
4.18
1eV = ________J
1.6 * 10^-19 J
