What is the evidence that suggests the past and present existence of surface water on Mars?
What will be an ideal response?
Runoff channels from old rivers and outflow channels from catastrophic flooding in the distant past. Recent mudflows down the sides of some canyons and crater walls suggest occasional eruptions of liquid water persist to this day, as imaged by the Global Surveyor. The Rovers in 2004 also found clear evidence of sedimentary rocks formed under water at both the landing sites, on opposite sides of the globe.
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A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum tensile stress in the cylindrical part of the tank is approximately:
(A) 45 MPa
(B) 57 MPa
(C) 62 MPa
(D) 75 MPa
A one-way mirror works because of
a. interference b. diffraction c. its surfaces being half-silvered d. dispersion e. polarization
A 0.30 % C carbon steel is heated
If the frequency of an electromagnetic wave increases, does the number of waves passing by you increase, decrease, or stay the same?
What will be an ideal response?