Neutron activation analysis for a sample of a rock revealed the presence of 131 53i, which has a half-life of 8.08 days . assuming the isotope was freshly separated from its decay products, what is the mass of 131 53i in a sample emitting 1.00 mci of radiation?

An uncharged nonconductive hollow sphere of radius 18.0 cm surrounds a 12.0 µc charge located at the origin of a cartesian coordinate system. a drill with a radius of 1.00 mm is aligned along the z axis, and a hole is drilled in the sphere. calculate the electric flux through the hole.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?