It was a children versus grown-ups competition at school. one event required the adult to throw a basketball as far as he could. when it was the child's turn, he had to throw a baseball instead. the event coordinator said, "it's only fair! " based on newton's laws, was this event fair?

(a)yes, because an adult can apply more force than a child can. making the adult's object bigger than the child's object to even out the acceleration.
(b)no, because a basketball is bigger than a baseball, and objects that are bigger accelerate slower.
(c)yes, because acceleration doesn't depend on the size of the object.
(d)no, because you must have the same size object in a competition.

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?

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.