Question 7(Multiple Choice Worth 2 points) In order to be considered an ion, an atom must have a
positive charge
charge
Onegative charge
neutral charge

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?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?