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A satellite revolves in an equatorial plane around the earth at an altitude equal to the radius of earth.A very sensitive device can detect its shadow made on the earth surface by the sun rays . find the average velocity of the shadow to a non rotating frame fixed with the centre of the earth . Escape velocity from the surface is Ve?  

in this ques u say that reaction by partition is 177.5 because friction acts.but sir i doubt here because ncert says-we assume perfect contact between bodies A and B and the rigid that case the self adjusting normal force on B by the partition equals 200N.ncert says since there is no impending motion as there is no space for the motion and hence no friction.can u plz once again resolve the issue asap  

Stomach acid is a solution of HCl with concentration of 1.2 × 10–3 M. What is the pH of stomach acid?  

Naturally occuring boron consists of two isotopes whose atomic weights are 10.01 and 11.01. The atomic weight of natural boron is 10.81. Calculate the percentange of each isotope in natural boron.  

An ideal spring with spring constant k is hung from the ceiling and block of mass M is attached to its lower end. The mass is released with the spring initially unstreched. How long the spring will extend?