Potassium-40 decays into daughter isotopes with a half-life of _____
A) 1.25 billion years
B) 1.5 billion years
C) 1.75 billion years
D) 2 billion years
A
Physics & Space Science
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Buoyancy: A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force on the block due to the water? The density of water is 1000 kg/m3.
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The intensity level of an orchestra is 85 dB. A single violin achieves a level of 70 dB. How does the intensity of the sound of the full orchestra compare with that of the violin?
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What is the minimum work that a motor must do to lift a 70 lb object from the floor to a height of 14 feet?
a. 5 b. 70 c. 700 d. 980 e. 2010 ft-lbs
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What is soil additions?
What will be an ideal response?
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