Mike has installed a light bulb at the bottom of his water pool. At night, he turns on the light. He observes that the light produces a bright circle with a radius
of one meter on the water surface. The rest of the surface is completely dark.
The reason is that the rest of the light rays go under total internal reflection and
do not get out of the water. How deep is the pool? The refraction index of water
is n=1.3.

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

Determine the maximum r-value of the polar equation r =3+3 cos 0