Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day, while that of Y is about a week
Suppose a radioactive sample consists of a mixture of these two nuclides. If the mixture is such that the activities arising from X and Y are initially equal, then a few days later the activity of the sample will be due
A) predominantly to Y. B) to X and Y equally.
C) predominantly to X. D) entirely to Y.
A
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A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of 8000 kg and ejects gas with a velocity of 2000 m/s. How much gas must be ejected in the first second to give the rocket an acceleration of 30.0 m/s2?
A) 120 kg B) 7.50 kg C) 15.0 kg D) 12.0 kg E) 150 kg
The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ? ? m
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A roller skate at rest may have
A) speed. B) velocity. C) momentum. D) energy.
A sound with ten times the amplitude of another sound is judged to be
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