Recent content by bolbol2054

torque about axis of rotation of the door left side

https://ibb.co/drnjDG will the torque for this force = 0 explain according to the torque relation

thank you sir

my question is Does 1 kg of iron contain the same number of protons as 1kg of aluminium,hydrogen and wood Can we define mass of matter with no of protons and neutrons it contains?

you must take in consideration difference between Average velocity and Instantaneous velocity x = vt v is average velocity x= 1/2* (V0 + V )t now v is velocity at time t

we define the ATM. pressure as the weight of cylinder of air above the Earth with surface area for its base equal 1 m2 referring to this definition how could we illustrate the pressure at 1- a room with roof . 2- a room without roof . 3- vacuum room.

that's now clear thank you

we know that electric current result of motion of electrons through aconductor and resistance result of electron's collisions with matter's nuclei resulting in heating material my question is what is the effect of positive electric field of nuclei at the motion of negative electrons ...

yes sir that's exactly what i meant but i want to know with more diagramatic illustration the effect of molecule's shape on this behaviour i thought that such basic phenomena had a lot of discussion in previous threads

i meant with strange behavior that water contradicts the role of decreasing density due to increasing temperatur at a range from 0 c degree to 4 c degree

please is there a topic that discuss with illustration factor that causes Strange behavior of the density of the water around the freezing point

why although the equations of momentum and kinetic energy of an object contains the same symbols m and v we note in an inelastic collision that momentum unlike the kinetic energy is conserved

thank you

as scientists defines it work is the product of force and displacement i just want to ask is the displacement meusured during force application or during motion even if the force removed thank you

thank you mr dave and mr russ i have understood from the link that the water-land distriputions between north and south Earth hemispheres make the Earth as awhole cooler in jan and hotter in jul