Wave Characteristics: How far does a beam of light travel in 2.0 ms? (c = 3.0 × 108 m/s)
A. 6.0 × 105 m
B. 0.66 × 105 m
C. 90 m
D. 70 m
E. 60 m
Answer: A
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The atom 40K decays radioactively to the gas 40Ar. An ancient rock is found to contain enough 40Ar gas to indicate that 77.0% of the 40K in the rock has decayed to 40Ar since the rock solidified
(Any previous argon would have boiled out of liquid rock.) How long ago did the rock solidify? The half-life of 40K is 1.25 billion years. A) 2.65 billion years B) 0.471 billion years C) 1.80 billion years D) 0.324 billion years
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A violin with string length 32 cm and string density 1.5 g/cm resonates with the first overtone from a 2.0-m long organ pipe with one end closed and the other end open. What is the tension in the string?
A) 1000 N B) 110 N C) 450 N D) 4100 N E) 56 N
A transformer consists of a 1000-turn primary coil and a 4000-turn secondary coil. If the current in the secondary is 3.00 A, what is the primary current?
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