You have trained all year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4.5 hours.
what would your average speed have to be to complete the race in 4.5 hours? give you answer in kilometers per hour.

Un jugador de beisbol batea un foul recto en el aire.la pelota deja el bate con una rapidez de 120 km/h. en ausencia de resistencia del aire. ? cual sera la rapidez de la pelota cuando la atrape el catcher

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=

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?