2. Una pelota cayó desde un edificio de 80m de altura, si llegó a tierra con una rapidez de 40 m/s. Calcula el tiempo que transcurrió.2. Una pelota cayó desde un edificio de 80m de altura, si llegó a tierra con una rapidez de 40 m/s. Calcula el tiempo que transcurrió.

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?