A girl pulls a trolley and the trolley moves through a distance. Do you think work is done in this situation?
Work is done
No work is done
Only force is given
None of these.
Which type of energy does the flowing water possess ?
Gravitational
Potential
Electrical
Kinetic
Asha lifts a doll from the floor and places it on a table. If the weight of the doll is known, what else does one need to know in order to calculate the work Asha has done on the doll?
The time required
Height of the table
Mass of the doll
Shape of the doll
An object of mass 12 kg is at a certain height above the ground. If the potential energy of the object is 480 J,find the height at which the object is with respect to the ground? Given g = 10 ms-2
4 m
4 mm
40 m
400 m
Unit of workdone is
newton
watt
joule
weber
The speed of a motor car becomes six times increased ,What will be the change in kinetic energy of the car ?
6 times
36 times
12 times
24 times
1 kilo watt =
10 watts
100 watts
500 watts
1000 watts
The mass of an object P is double the mass of Q. If both move with the same velocity, Find out the ratio of K.E.of P to Q ?
1:2
2:1
1:4
4:1
A body of mass 20kg is dropped from a height of 2m. If g is taken to be equal to 10m/s2. Calculate the kinetic energy of the body just before striking the ground ?
400 J
4 J
40 J
.4 J
Two girls, each of weight 400 N climb up a rope through a height of 8m. We name one of the girls as A and the other as B. Girl A takes 20s while B takes 50s to accomplish this task. What is the power expended by each girl ?
64 W girl A and 160 W for girl B
128 W girl A and 320 W for girl B
160 W for girl A and 64 W for girl B
320 W for girl A and 128 W for girl B
