An egg rolls off a kitchen counter and breaks as it hits the floor. the counter is 1.0 m high, the mass of the egg is about 50 g, and the time interval during the collision is about 0.010 s.
how large is the impulse that the floor exerts on the egg?
use equations of motion to find the velocity just before it hits the floor:
vf^2 = vi^2 + 2gx final velocity = 4.42m/s impulse is change in momentum so: m(vf - vi) = 0.05(0 - 4.42) = - 0.221 kg. m/s

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom