Only at the equator are all the stars visible over the course of the year
Indicate whether the statement is true or false
TRUE
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Which of the following is not massless?
A) neutrino B) graviton C) photon D) muon
Can anything be done to stretch out the fuel supply for fission nuclear reactors so that such reactors could be used for many more centuries?
A) No, because fission reactors must use uranium, and uranium resources will run out within a century. B) No, because fission reactors must use plutonium, and plutonium resources will run out within a century. C) Yes, by converting the 238U into 235U and then fissioning the 235U. D) Yes, by converting 238U into plutonium and then fissioning the plutonium. E) Yes, by using uranium that is less highly enriched that the uranium fuel in use today.
How much work is required to stretch an ideal spring of spring constant (force constant) 40 N/m from x = 0.20 m to x = 0.25 m if the unstretched position is at x = 0.00 m?
A) 0.45 J B) 0.80 J C) 1.3 J D) 0.050 J
Radioactivity was discovered in
a. Berlin. b. Berkeley. c. Paris. d. Cambridge.