Around decorative leaf, radius 50cm, with a long stem from the center of the leave, is placed in a fish tank. what is the longest length possible of the petiole for us to not see any of its image? (no light from the petiole enters the air). n_air = 1, n_water = 4/3.

Which statement best explains why an object weight less on mercury than it does on earth

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?