Briefly explain how Hubble's discovery of a relationship between galactic distance and redshift led to the idea of the Big Bang
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Hubble's discovery showed that the universe is expanding. If the universe is expanding, then it should have been smaller in the past. Extrapolating back, there must have been a time when everything was in one place—which we call the Big Bang.
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A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in air is 343 m/s
A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz
As minerals crystallize in cooling magma, are the minerals with lower amounts of silica or the minerals with higher amounts of silica the first to crystallize?
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An electron is released from rest at the negative plate of a parallel-plate capacitor. If the distance across the plate is 2.0 mm and the potential difference across the plate is 6.0 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10^?31 kg, e = 1.6 × 10^?19 C)
a. 2.1E+5 m/s b. 1.5E+12 m/s c. 5.3E+5 m/s d. 1.5E+6 m/s e. 2.1E+6 m/s
Fermium-253 has a half-life of 3.00 days. A sample of fermium has 3.88 × 106 nuclei. What is the initial activity of this sample?
A) 10.4 kBq B) 12.9 kBq C) 12.9 Bq D) 10.4 Bq