A space barge pushes on a spaceship with a rest mass of 15,000 kg and accelerates it from a speed of 0.600c to a speed of 0.700c. How much work does the barge have to do to accomplish this? (c = 3.00 × 108 m/s)
A) 2.03 × 1020 J B) 2.70 × 1020 J C) 8.78 × 1019 J D) 5.42 × 1020 J E) 1.35 × 1020 J
A
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Differential rotation occurs in the __________ Sun; we know this because the ____________ travels faster than the ___________
a. gaseous, equator, poles b. liquid, poles, equator c. solid, equator, poles d. gaseous, poles, equator
How much compressional stress builds up in a thick aluminum bar held between 2 immovable walls if the temperature increases by 20. C°? (? = 24. × 10-6 C-1, Y = 7 × 1010 N/m2)
A) 34. × 105 N/m2 B) 34. × 107 N/m2 C) 34. × 106 N/m2 D) 34. × 104 N/m2 E) 34. × 108 N/m2
An electron and a proton are released simultaneously from rest and start moving toward each other due to their electrostatic attraction, with no other forces present
Which of the following statements are true just before they are about to collide? (There could be more than one correct choice.) A) They are closer to the to the initial position of the electron that to the initial position of the proton. B) They are closer to the to the initial position of the proton that to the initial position of the electron. C) They are at the midpoint of their initial separation. D) They both have the same speed. E) The electrostatic force exerted on the proton is greater than the electrostatic force exerted on the electron.
John and Linda are arguing about the definition of density. John says the density of an object is proportional to its mass. Linda says the object's mass is proportional to its density and to its volume. Which one, if either, is correct?
a. They are both wrong. b. John is correct, but Linda is wrong. c. John is wrong, but Linda is correct. d. They are both correct. e. They are free to redefine density as they wish.