Work energy power full lesson

Question 1

when is work done ?

Answer 1

work is said to be done when the force applied on a body makes the body move

Question 2

is displacement is 0 , then work is?

Answer 2

zero

Question 3

while standing with a heavy load does a coolie do work ?

Answer 3

no , since displacement is 0

Question 4

amount of work on a body depends on ? [ two factors ]

Answer 4

magnitude and displacement

Question 5

work formula

Answer 5

F*S = WORK

Question 6

Work formula on basis of cos

Answer 6

w = f*Scos

Question 7

when the displacement is normal to the direction of work ? what will happen to work?

Answer 7

work will be zero

Question 8

w = _____, on basis of mass , gravity and height

Answer 8

w=mgh

Question 9

for calculating height for the stairs ? the formula is?

Answer 9

h = number of stairs * height of each stairs

Question 10

unit of work =_____

Answer 10

joule

Question 11

1 joule = _____ * __________

Answer 11

1 joule = 1newton * 1 metre

Question 12

1 kj =____

Answer 12

1 kj =10^3

Question 13

1 mj =

Answer 13

10^6 j

Question 14

1 gj =

Answer 14

10^9 j

Question 15

c.g.s unit of work

Answer 15

erg

Question 16

1 erg = ______ * ________

Answer 16

1 dyne * 1 cm

Question 17

1 joule = ______ erg

Answer 17

10^7 erg

Question 18

work is ______ quantity scalar or vector

Answer 18

scalar

Question 19

power = _________ [formula]

Answer 19

w/t

Question 20

power is _______ quantity

Answer 20

scalar

Question 21

power depend on 2 factors

Answer 21

amount of work done and time taken for it

Question 22

power formula on basis of average speed

Answer 22

p = f*v

Question 23

unit of power =

Answer 23

watt

Question 24

1 watt = _____ / ______

Answer 24

1joule / 1 sec

Question 25

1kw = ___

Answer 25

10^3 watt

Question 26

1 mw =

Answer 26

10^6 watt

Question 27

1 gw=

Answer 27

10^9 watt

Question 28

1milliwatt =

Answer 28

10 ^ -3

Question 29

1 micro watt =

Answer 29

10^-6

Question 30

c.g.s unit of power =

Answer 30

erg/sec

Question 31

1 watt = _____erg/s^1

Answer 31

10^7

Question 32

1 H.P =___

Answer 32

746 w

Question 33

Energy is a ______ quantity

Answer 33

scalar

Question 34

there is no transfer of energy when _____

Answer 34

force is acted upon the direction of displacement

Question 35

1 watt hr =________ kj

Answer 35

3.6 kj = 3600 j

Question 36

1kwh = ______ MJ

Answer 36

3.6 MJ

Question 37

1 KWH = _____J

Answer 37

3.6 * 10^6 J

Question 38

POWER * TIME =

Answer 38

ENERGY

Question 39

HEAT ENERGY IS MEASURED IN _____

Answer 39

CALORIE

Question 40

1 CALORIE IS REQUIRED TO RAISE TEMP OF _______G water FROM _____ TO ______ *C

Answer 40

1G OF WATER FROM 14.5 TO 15.5

Question 41

1 J =_____ CALORIE

Answer 41

0.24

Question 42

1 CALOIRE =______J

Answer 42

4.18

Question 43

1eV = ________J

Answer 43

1.6 * 10^-19 J