An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg.

How will the plate cool faster & not the sphere

(a) The mass of 1 mole of nitrogen atoms is 14g.  (b) The mass of 4 moles of aluminium atoms is (4 × 27)g = 108g  (c) The mass of 10 moles...

1 mole of aluminium oxide (Al2O3) = 2 × 27 + 3 × 16 = 102g  i.e., 102g of Al2O3 = 6.022 × 1023 molecules of Al2O3  Then, 0.051 g of Al2O3...

What about the work done by friction?.. Since the friction is lesser in the solid spheres case and they both cover same distances.... Shouldn't the solid sphere reach with greater...

The correct answer is (a) 1/8 Explanation:  For wires of the same material, the elongation is directly proportional to the length and inversely proportional to the cross-sectional area.  Δl/l = F/AY  →Δl =Fl/AY {Here...

The correct answer is  (a) Both will emit equal amount of radiation per unit time in the biginning.  (b) Both will absorb equal amount of radiation from the surrounding in the biginning. 

(d) all will take same  Explanation:  Since there is no friction on the incline, the only force on each of these objects along the incline is their weight component mg.sinθ.  So each of...

(b) The solid sphere reaches the bottom with greater speed. Explanation:  For a hollow sphere, the linear acceleration  a = (3/5)g.sinθ = 0.60g.sinθ  For solid sphere a = (5/7)g.sinθ = 0.71g.sinθ  Since 'a' for solid sphere is...