A slab of stone of 0.36 m and thickness 10cm is exposed on the lower surface to steam at 100°c. A block of ice at 0°c
rests on the upper surface of the slab. in one hour 4.8 kg of ice is melted. calculate the thermal conductivity of stone.
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Which material produces static charge when rubbed ?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)