Asmall block with mass 0.0400 kg is moving in the xy-plane. the net force on the block is described by the potential-energy function u(x, y) = (5.80 j/m2 ) x2 − (3.60 j/m3 ) y3 . what are the magnitude and direction of the acceleration of the block when it is at the point (x=0.300 m, y=0.600 m)? draw the acceleration vector with components, and make a sketch of the potential energy vs. x and y

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Apoint charge +q is at the origin. a spherical gaussian surface centered at the origin encloses +q. so does a cubical surface centered at the origin and with edges parallel to the axes. select "true" or "false" for each statement below. the electric flux through the spherical surface is greater than that through the cubical surface. suppose (for this statement only), that q is moved from the origin but is still within both the surfaces. the flux through both surfaces remains unchanged. the area vector and the e-field vector point in the same direction for all points on the spherical surface. the e-field at all points on the spherical surface is equal due to spherical symmetry. the flux through the spherical gaussian surface is independent of its radius.

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