Ametal object is suspended from a spring scale. the scale reads 943 n when the object is suspended in air, and 799 n when the object is completely submerged in water.
a. find the volume of the object. the acceleration of gravity is 9.8 m/s². answer in units of m³.
b. find the density of the metal. answer in units of kg/m³.

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants