Aprojectile of mass 0.850 kg is shot straight up with an initial speed of 30.0 m/s. (a) how high would it go if there were no air resistance? (b) if the projectile rises to a maximum height of only 36.7 m, determine the magnitude of the average force due to air resistance.

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?

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.