Find the energy in MeV released in the reaction: U ? Th + He Mass of 238U = 238.050786 u Mass of 234Th = 234.043583 u Mass of 4He = 4.002603 u
What will be an ideal response?
4.28 MeV
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One mole of Strontium-90 is decaying with a half life of 28. years. After 61. years, how much Strontium is left and what is its activity?
What will be an ideal response?
An AC voltage source, with a peak output of 72 V, results in dissipation of energy in a resistor at rate of 140 W. What is the value of the resistance?
a. 37 ? b. 26 ? c. 9 ? d. 19 ? e. 52 ?
Suppose the ends of a 27-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area of 35 cm2 . What force does the beam exert when it is heated to 39°C? (?steel = 1.1 × 10^?5/C°, Ysteel = 2.0 × 10^11 N/m2)
a. 3.0E+5 N b. 1.2E+3 N c. 1.7E+3 N d. 2.3E+2 N e. 7.5E+4 N
How far from a +50-mm focal length lens, such as is used in many 35-mm cameras, must an object be placed so it will form a real image that is 3.0 times the size of the object?
A) 46 mm B) 52 mm C) 58 mm D) 67 mm