The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system.
b. inelastic collisions between particles within the system.
c. changes of momentum of individual particles within the system.
d. internal forces acting between particles within the system.
e. external forces acting on particles of the system.
E
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Water is flowing through a pipe with a constriction. The diameter of the narrow section is one-half the diameter of the wide section. If the velocity of the incompressible fluid is 3.20 m/s in the wide section, then what is the velocity of the fluid in the narrow section?
A. 16.5 m/s B. 18.7 m/s C. 19.8 m/s D. 10.5 m/s E. 12.8 m/s
If the human eyeball is too short from front to back, this gives rise to a vision defect that can be corrected by using
A) convex-convex eyeglasses. B) concave-convex eyeglasses. C) cylindrical eyeglasses. D) contact lenses, but no ordinary lenses. E) shaded glasses (i.e., something that will cause the iris to dilate more).
The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
Electrons in an x-ray machine are accelerated from rest through a potential difference of 80,000 V. What is the kinetic energy of each of these electrons in eV?
a. 128 eV c. 80 eV b. 40 eV d. 80 keV