En un libro de astronomía, Elena encuentra el siguiente espectro cósmico de una ga- laxia, tomada en dos momentos diferentes: Las diferencias que se observan en el espectro de la galaxia constituyen una evidencia:

I. de que la galaxia se está alejando.
II. de que el universo se encuentra en expansión.
III. del origen del sistema solar.

¿Cuál o cuáles de las siguientes afirmaciones es o son correctas?

A
Solo I.

B
Solo II.

C
I y II.

D
II y III.

E
I, II, III.

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.