physic question?

Question

with spending one jole energy , till what heigh u can rise a 1 kg book from a surface of a table in right direction ?

please write the way of solution

Answer 1

I assume that the right direction is up as in apposite to the Earth’s gravitational pull.
Work=Energy = (Force) x (distance)

The force equals to the weight of the book which I hope still is F=mg=1kg x 9.81m/s^2=9.81 Newtons (N)

Then the distance must be d=Work/Force=1Joul/9.81N= 0.102 meters or 10.2 cm

Was that useful?

Answer 2

PE = mgh
* PE = Energy (in Joules)
* m = mass (in kilograms)
* g = gravitational acceleration of the earth (9.8 m/sec2)
* h = height above earth's surface (in meters)

h = PE/mg = 1/(1*9.8) ~0.1meter

Answer 3

you know: E(j)=m(kg).g(j/kg.m).h(m)
1=1.g.h
h=1/g
and the scaler amount of h depends on g.

Answer 4

There are so many things wrong with that question, I don't even know where to begin.....