1. Based on the setup below, which of the following statements is true? (Assume the car starts at rest and there is no friction.)

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

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=