_____ was a type II supernova that was produced by the explosion of a hot, blue supergiant
A) SN 1572
B) SN 1604
C) SN 1987A
D) SNR 1868
C
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Astronomers measured the location of the Sun in the Milky Way Galaxy by
A. counting the number of stars. B. plotting the position of O and B stars. C. plotting the position of globular star clusters. D. plotting distribution of water molecules.
A frictionless simple pendulum, with a small but dense 4.4-kg bob at the end and a length of 75 cm, is released from rest at an angle of 50° with the vertical
(a) To what height above its lowest point does the bob swing on the other side? (b) What is the speed of the bob at the bottom of the swing?
Water flows through a horizontal pipe of cross-sectional area 10. cm2 at a pressure of 0.25 atm. The flow rate is 1.0 L/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.0 cm2. What is the pressure at the valve?
A) 7.7 × 103 Pa B) 0.200 atm C) 0.112 atm D) 0.235 atm E) 0.157 atm
The first complex life appeared on Earth about 0.5 billion years ago during the
a. Jurassic Period. b. Mississippian Period. c. Cambrian Period. d. Precambrian Period. e. Neolithic Period.