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please check my work... urgent pleasezz 1> ZnCl2 [aq] + 2KNO3 [aq] → Zn(NO3)2[aq] + 2KCl (s) 2> Ca[OH]2 [aq] + 2Na OAc [aq] →Ca(OAc)2[aq] + 2NaOH (s) 3> NiCl2 + 2KOH → Ni(OH)2 [aq]+ 2KCl (s)

need help please urgent Homework Statement An object is released from rest at an altitude h above the surface of the Earth. (a) Show that its speed at a distance r from the Earth’s center, where RE < r < RE + h, is given by v = sqrt(2GME (1/r -1/ (RE + h) ) (b) Assume the release...

need help please urgent An object is released from rest at an altitude h above the surface of the Earth. (a) Show that its speed at a distance r from the Earth’s center, where RE < r < RE + h, is given by v = sqrt(2GME (1/r -1/ (RE + h) )...

question:how many miles around the world via the Poles ? is it circumference of he earth..?

please cjeck my work..? http://www.uploadfile.info/uploads/dd0c7dcf1d.bmp

this is what I have done and am not sure its correct or not...I am confused...I need it today please check my work.. uploaded the work on this link.. http://www.uploadfile.info/uploads/50e7ebf4ec.gif

Free body diagrams Draw the direction and magnitude of all the forces acting on the block of mass m when it is: (a) Stationary on the incline (b) Sliding down the incline with velocity, V (c) Sliding on a concave surface with velocity, V. All surfaces have friction.

The end A of the link in a guide has a constant downward velocity of 3 m/s as shown in the diagram. For the instant where the link AB makes an angle of 75 degrees with the vertical guide calculate the magnitude and direction of the velocity of the roller at B, the magnitude and direction of...

attaching the image here: http://www.uploadfile.info/uploads/963f4c9f8f.gif thankyou

please help urgent Draw the direction and magnitude of all the forces acting on the block of mass m when it is: Sliding on a concave surface with velocity, V.