According to the Big Bang theory, ordinary matter did not exist in the first microsecond after the beginning. All the matter in the universe was a sea of ________.
Fill in the blank(s) with the appropriate word(s).
quarks
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What is the slit spacing of a diffraction necessary for a 600 nm light to have a first order principal maximum at 25.0°?
A) 1.42 ?m B) 2.01 ?m C) 3.12 ?m D) 4.12 ?m E) 5.44 ?m
A certain pendulum consists of a 1.5-kg mass swinging at the end of a string (length = 2.0 m). At the lowest point in the swing the tension in the string is equal to 20 N. To what maximum height above this lowest point will the mass rise during its oscillation?
a. 77 cm b. 50 cm c. 63 cm d. 36 cm e. 95 cm
Newton's Second Law in 2 Dimensions: A 1000-kg barge is being towed by means of two horizontal cables. One cable is pulling with a force of 80.0 N in a direction 30.0° west of north. In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable is 120 N? Assume that the water exerts no appreciable frictional drag on the barge.
A. 19.5° east of north B. 21.1° east of north C. 39.0° east of north D. 47.5° east of north E. 54.7° east of north
Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do
A) Both men do positive work, but Joel does 75% more work than Jerry. B) Both men do positive work, but Joel does 50% more work than Jerry. C) Both men do positive work, but Jerry does 50% more work than Joel. D) Both men do positive work, but Joel does 25% more work than Jerry. E) Neither of them does any work.