Which of the following elements is NOT produced by neutron star mergers?
A. Copper
B. Lead
C. Silver
D. Gold
E. Uranium
Answer: A
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Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 50 Mpc away would have a recession velocity of _______________ km/s. (Round your answer to the nearest 1 km/s)
Fill in the blank(s) with correct word
Wave Characteristics: How much time does it take a beam of light to travel 2.9 km through space? (c = 3.0 × 108 m/s)
A. 9.7 s B. 9.7 ms C. 9.7 ?s D. 9.7 ns E. 9.7 ps
The total number of stars in the observable universe is about
A) 100 billion. B) the same as the number of grains of sand in a school sandbox. C) the same as the number of grains of sand on all the beaches on Earth. D) the same as the number of atoms that make up the Earth.
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT