4. Kim pushes a lawn mower across a lawn by applying a force of 95 N along the handle that makes an angle of 60° to the horizontal,
a. What are the horizontal and vertical components of this force?
b. The handle is lowered so it makes an angle of 30° with the horizontal, Now what
are the horizontal and vertical components of the force?

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=

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Use vsepr theory to predict the molecular geometry of the molecule hcn.