Based on your knowledge of the gravitational force near the surface of the earth and on newton's second law, explain the sign and magnitude of the acceleration of the coin in the last question during the three portions of its motion.

on its way up ;

at the highest point ;

on the way down ;

a. 9.8 m/s2
b. 0 m/s2
c. -9.8 m/s2
d. none of the other choices are correct for this situation.

What is the momentum of a 2 kg object moving at 15 meters per second

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine