O 3910 W Question 29
1 pts
Stephanie is pushing a laboratory cart into the storage closet. If she applies a 63 N force for a
period of 2.2 seconds, how much will the cart's momentum change during that period?
A. 29 kg*m/s
b. 140 kg*m/s
c. 63 kg*m/s
d. 260 kg*m/s

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.