How are electromagnetic waves different from mechanical waves? (2 points) Electromagnetic waves are all high frequency; mechanical waves are all low frequency.
Electromagnetic waves can travel through a vacuum; mechanical waves require a medium.
Electromagnetic waves are visible; mechanical waves are invisible.
Electromagnetic waves always reflect; mechanical waves always refract.

Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j

What is the lowest number energy level where a d sublevel is found

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.