The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the disintegration constant (in s?1)?
a. 5.6 × 10^?2
b. 5.6 × 10^8
c. 3.2 × 10^7
d. 1.8 × 10^?9
e. 1.6 × 10^6
d
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Four students are talking about the kind of energy that's fundamental to life on Earth. Thomas says it is electrical energy. Susan opts for solar energy. Lawrence argues in favor of chemical energy. Kimberly is sure it's mechanical energy.
Who is correct?
a- Thomas
b- Susan
c-Lawrence
d-Kimberly
Torque: A flat circular coil has 200 identical loops of very thin wire. Each loop has an area of 0.12 m2 and carries 0.50 A of current. This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What is the magnitude of the magnetic torque on the coil?
A. 0.25 N ? m B. 0.52 N ? m C. 2.5 N ? m D. 5.2 N ? m
You have taken a picture of a galaxy 1 billion light years away. That picture shows
A) a galaxy that is 1 billion years old. B) a galaxy that is 1 billion light years old. C) a galaxy that is 13 billion years old. D) a galaxy as it was 1 billion years ago.
Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm from each wire?
a. 57 mT b. 80 mT c. 64 mT d. 48 mT e. 40 mT