Which of the following statements is FALSE?
A) In our universe, at earlier times, everything was closer together.
B) The universe is expanding.
C) For an observer located in a galaxy all other distant galaxies would appear to move away from his.
D) The universe looks the same in all directions; i.e. it is homogeneous and isotropic.
E) We are at the center of the universe.
Ans: E) We are at the center of the universe.
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All four of Jupiter's big moons, like most moons in the solar system, revolve clockwise (retrograde) around their planet's equator
Indicate whether the statement is true or false
What is the escape speed from a planet of mass m and radius r if m = 3.2 × 10^23 kg and r = 2.4 × 10^6 m?
a. 5.5 km/s b. 4.2 km/s c. 5.2 km/s d. 4.8 km/s e. 3.7 km/s
One rad is
a. the amount of radiation that deposits 10?2 J of energy into 1 kg of absorbing material. b. the amount of ionizing radiation that will produce 1/3 × 10^?9 C of electric charge in 1 cm3 of air under standard conditions. c. the amount of radiation needed for ionization of an atom. d. the amount of radiation needed for dissociation of a molecule. e. the amount of radiation that deposits one erg of energy in 1g of material.
To calculate the pressure in the standard atmosphere at 6000 m, the lapse rate is used. The percentage error, considering the pressure is nearest:
(A) 0.08% (B) 0.13% (C) 0.24% (D) 0.31%