Which of the following have the least RBE (relative biological effectiveness)?
A) slow neutrons
B) beta particles
C) alpha particles
D) fast protons
E) gamma rays
E
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The shape of Earth's magnetosphere is modified by
a. the Moon's tidal force. b. the solar wind. c. Earth's own gravity. d. asymmetries in the shape of Earth's core. e. Earth's elliptical orbit.
A brass bar (E 5 110 MPa) of length L 5 2.5 m has diameter d1 5 18 mm over one-half of its length and diameter d2 5 12 mm over the other half. Compare this nonprismatic bar to a prismatic bar of the same volume of material with constant diameter d and length L. The elon-gation of the prismatic bar under the same load P 5 25 kN is approxi-mately:
(A) 3 mm
(B) 4 mm
(C) 5 mm
(D) 6 mm
A home appliance is rated at 250. watts ic connected to 120. V
(a) What current does it draw? (b) What is its resistance? (c) How many kw-h does it use in one 24-hour day?
Two kilograms of water at 100°C is converted to steam at 1 atm. Find the change in internal energy (in J). (Lv = 2.26 × 10^6 J/kg.)
a. 2.1 × 10^4 b. 4.5 × 10^6 c. 3.4 × 10^5 d. 4.2 × 10^6 e. 2.1 × 10^6