To date, physicists have investigated the behavior of matter and energy at temperatures as high as those that existed in the universe as far back as ________ after the Big Bang
A) 1 million years
B) 300,000 years
C) 300 years
D) 3 minutes
E) 10-10 second
E
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Elementary Particles: Which of the following statements about hadrons are correct? (There may be more than one correct choice.)
A. Hadrons are composed of leptons. B. All hadrons are composed of quarks. C. All hadrons interact by the strong nuclear force. D. Electrons, protons, and neutrons are commonly-occurring hadrons. E. Protons and neutrons are hadrons, but the electron is not.
Suppose that you use a super-fast computer to measure a system’s macropartition a billion times a second. What is the approximate probability of the least-probable macropartition that you might plausibly see in your lifetime? Select the closest response
A. 1 chance in a million (106) B. 1 chance in a billion (109) C. 1 chance in a trillion (1012) D. 1 chance in 1015 E. 1 chance in 1018 F. 1 chance in 1021
The ratio of the kinetic energy of object A to the kinetic energy of the object B is 2:1. The mass of object A is 2.0 kg and the mass of object B is 4.0 kg. If object A has a speed of 4.0 m/s, what is the speed of object B?
A) 8.0 m/s B) 6.0 m/s C) 4.0 m/s D) 1.4 m/s E) 2.0 m/s
At their closest approach, Venus and Earth are 4.20 × 1010 m apart. The mass of Venus is 4.87 × 1024 kg, the mass of Earth is 5.97 × 1024 kg, and G = 6.67 × 10-11 N ? m2/kg2
What is the magnitude of the gravitational force exerted by Venus on Earth at that point? A) 1.10 × 1018 N B) 4.62 × 1028 N C) 5.43 × 1026 N D) 6.30 × 1020 N E) 1.72 × 1019 N