The dark halo is now believed to extend at least
A) 100,000 light-years.
B) 50 kpc.
C) 8 kpc.
D) 15,000 light-years.
E) 15 kpc.
B
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A thin-walled cylindrical tank with a diameter of 200 mm has an internal pressure of 11 MPa. The yield stress in tension is 250 MPa, the yield stress in shear is 140 MPa, and the factor of safety is 2.5. The mini-mum permissible thickness of the tank is approximately:
(A) 8.2 mm (B) 9.1 mm (C) 9.8 mm (D) 11.0 mm
Which of the following best describes the image of a concave mirror when the object is at a distance greater than twice the focal point distance from the mirror?
a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one
If the following generic atom were to undergo ionization, what would be the charge of the most likely product?
A) +2 B) -2 C) -6 D) +6 E) would probably not ionize
A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 60°. Part of the beam is transmitted and part is reflected. What is the angle between the reflected and transmitted rays?
a. 85° c. 107° b. 28° d. 152°