Most of Mars' water is now locked in a ________ layer below the surface
Fill in the blank(s) with correct word
permafrost
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If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed? (e = 1.60 × 10-19 C, k = 1/4??0 = 8.99 × 109 N ? m2/C2, mel = 9.11 × 10-31 kg)
A) 5.9 × 107 m/s B) 4.9 × 107 m/s C) 3.9 × 107 m/s D) 2.9 × 107 m/s
A light ray strikes a hexagonal ice crystal floating in the air at a 30° angle to one face, as shown below. The hexagonal faces of the crystal are perpendicular to the plane of the page. All the rays shown are in the plane of the page, and nice = 1.30. Which outgoing ray is the correct one?
A. A B. B C. C D. D E. E
How much power does a sphere with a radius of 10 cm radiate into empty space if is has an emissivity of 1.0 and is kept at a temperature of 400 K? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 60 W B) 70 W C) 180 W D) 210 W E) 360 W
A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum tensile stress perpendicular to the welds is approximately:
(A) 22 MPa
(B) 29 MPa
(C) 33 MPa
(D) 37 MPa
