If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food?
a. increase pan bottom thickness
c. increase burner temperature
b. increase pan bottom area
d. decrease height of pan sides
A
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A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa
The diagram shown illustrates the location of the Solar System's eight planets and three large dwarf planets. Sort each object according to its basic composition.
What will be an ideal response?
The _____ of active galactic nuclei (AGN) is an attempt to explain the different types of AGN using a single model viewed from different directions
A) hierarchical model B) hybrid hierarchical model C) monolithic model D) unified model
In this photograph, the large and bright object in the sky is
A) a comet. B) an asteroid. C) a meteor. D) the northern lights