Propene and cyclopropane are
a. the same compound.
b. isomers.
c. neither isomers nor the same compound.
b
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Tycho failed to detect ______ for the nova of 1572 indicating it was ______
a. parallax; beyond the orbit of Earth's Moon b. parallax; inside the Earth's atmosphere close to Earth c. light; beyond the orbit of Earth's Moon d. light; inside the Earth's atmosphere close to Earth
The potential energy of a spring is 0.25 J when it is compressed 0.04 m to the left of its equilibrium position. This is its leftmost position. What is its kinetic energy when it returns to the equilibrium point?
A. zero B. -0.3 J and moving to the left C. 0.3 J and moving to the right D. 0.3 J and at rest
A 200-? resistor, a 40.0-mH inductor and a 2.00-?F capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the impedance of this circuit?
A) 164 ? B) 120 ? C) 264 ? D) 200 ? E) 364 ?
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) predominantly to X. C) entirely to Y. D) to X and Y equally.