Suppose you were able to measure the composition of the first star that formed in the Milky Way's history. What would you expect it to have been made of at the time of its birth?
A) 100% hydrogen
B) 75% hydrogen, 25% helium, and less than 0.1% other elements
C) 98% hydrogen, 2% helium, and less than 0.1% other elements
D) 70% hydrogen, 28% helium, and 2% other heavy elements
B) 75% hydrogen, 25% helium, and less than 0.1% other elements
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Collisions in Two Dimensions: A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together after the collision. What is the speed of the wreckage just after the collision?
A. 6.10 m/s B. 12.2 m/s C. 25.0 m/s D. 35.0 m/s E. 17.3 m/s
An electron is released from rest at the negative plate of a parallel plate capacitor. If the distance between the plates is 5 mm and the potential difference across the plates is 5 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10?31 kg, qe = 1.6 × 10?19 C.)
What will be an ideal response?
He discovered that the orbits of planets are ellipses
A) Kepler B) Ptolemy C) Galileo D) Tycho Brahe E) Copernicus
If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?
A) 67 dB B) 13 dB C) 44 dB D) 88 dB