The total linear momentum of an isolated system of masses remains the same if there are no external ______________ acting on the system
a. forces
b. torques
c. unbalanced forces
d. unbalanced torques
c
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Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time?
A) the horizontal component B) the vertical component C) both of these D) neither of these
Neglecting recoil of the gold nucleus, how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10^-19 C) have to approach to within 1.95 × 10^-14 m of a gold nucleus (charge = 79 × 1.6 × 10^-19 C)? (ke = 8.99 × 10^9 N×m2/C2 and 1 MeV = 1.6 × 10^-13 J)
a. 14.6 MeV c. 18.2 MeV b. 11.7 MeV d. 22.7 MeV
Cold dust disks are _____________ disks around main-sequence stars, the dust of which is created by collisions among the planetesimals
Fill in the blank(s) with correct word
Two one-liter containers each contain 10 moles of a gas. The temperature is the same in both containers. Container A holds helium (molecular mass = 4 u), and Container B holds oxygen (molecular mass = 16 u). Which container has the higher pressure and by what factor?
a. Container A has 4 times the pressure of Container B. b. Container A has 2 times the pressure of Container B. c. Both containers have the same pressure. d. More information is needed to answer this question.