Un objeto se encuentra a 60 cm de un espejo cóncavo de 40 cm de radio y
el objeto es 4 cm de alto.

Calcular el tamaño de la imagen:
A) 30 cm
B) 25 cm
C) 20 cm
D) 16 cm

Calcular la posición de la imagen:
A)-5cm
B)-3cm
C)-2cm
D)-1cm

What happens to an isotope during radioactive decay?

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.