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A solid cone of height 25 cm and base diameter 25 cm floats in water with its vertex downwards such that 20 cm of its axis is immersed. The additional weight that must be placed at the centre of the base such that the cone now is completely immersed in water is-
(a) 1 kg
(b) 2 kg
(c) 3 kg
(d) 4 kg
Updated Thu, 20 Dec 2018 10:02 am

Answer the question 1.4
Coulomb's law for electrostatic force between two point charges and Newton's law for gravitational force between two stationary point masses, both have inverse-square dependence on the distance between the charges/masses. (a) Compare the strength of these forces by determining the ratio of their magnitudes (i) for an electron and a proton and (ii) for two protons. (b) Estimate the accelerations of electron and proton due to the electrical force of their mutual attraction when they are 1 \(\overset{\circ}{\mathrm {A}}\) (= \(10^{-10}\) m) apart? \((m_p = 1.67 \times 10^{-27}\ kg, m_e = 9.11 \times 10^{-31}\ kg)\)
Updated Wed, 12 Dec 2018 04:17 pm