Radioactivity Basics: During ?+ decay
A. a neutron is transformed to a proton.
B. a proton is transformed to a neutron.
C. a neutron is ejected from the nucleus.
D. a proton is ejected from the nucleus.
E. the number of nucleons decreases.
Answer: B
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Torque: A flat circular wire loop lies in a horizontal plane on a table and carries current in a counterclockwise direction when viewed from above. At this point, the earth's magnetic field points to the north and dips below the horizontal. Which side of the coil tends to lift off of the table due to the magnetic torque on the loop?
A. the north side B. the east side C. the south side D. the west side E. The entire loop lifts straight up.
Process of Science: Explain the phrase used by Carl Sagan, "Extraordinary claims require extraordinary evidence."
What will be an ideal response?
If the Hubble parameter is 25 km/s per million light years, how old is the universe?
A) 10 × 109 y B) 12 × 109 y C) 15 × 109 y D) 20 × 109 y E) 25 × 109 y
Two hoops or rings (I = MR2) are centered, lying on a turntable. The smaller ring has radius = 0.050 m; the larger has radius = 0.10 m. Both have a mass of 6.0 kg. What is the total moment of inertia as the turntable spins? Ignore the mass of the turntable
a. 0.030 kg•m2 c. 0.038 kg•m2 b. 0.0075 kg•m2 d. 0.075 kg•m2