An element has a body centred cubic structure with edge cell of 288 pm .The density of the element is 7.2 g/cm3.How many atoms are present in 208g of the element.
Two balls of masses 5 kg and 15kg are separated by a fixed distance of 0.8m. find the position of the centre of mass of system
explain the significance of the negative sign in gravitational potential energy?
complete the following reaction: 1.CH3-CH-_CH2+H2O 2.CH2-CH2+Br2