The van de graaff electrostatic generator develops a charge of approximately −1×10−5c and a pith ball has charge of approximately 1 × 10−9c. which of the following describes the relationship between the size of the force the van de graaff exerts on the pith ball and the size of the force the pith ball exerts on the van de graaff ?
(a) the van de graaff exerts a much larger force on the pith ball.
(b) the pith ball exerts a much larger force on the van de graaff.
(c) the forces have the same magnitude.

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.