Water flows over a 2-m-wide flat plate with the same velocities as in Problem 4 in the mini-exam for Section 4.4 where we found v = 0.0667 m/s. The frictional force F acting on the horizontal surface is nearest:
(A) 1300 N
(B) 1500 N
(C) 1700 N
(D) 1900 N
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We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from ________
A) determining the orbital properties of the planets B) examining high-resolution images of the planets made by orbiting telescopes C) examining spectral lines from the atmospheres of distant planets D) sending spacecraft to study the planets up close
An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower
The electric field amplitude of the signal at that point is 0.63 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the magnetic field amplitude of the signal at that point? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 2.9 nT B) 1.7 nT C) 1.3 nT D) 2.1 nT E) 2.5 nT
Which of the following is true of redshift?
A) Radiation that comes from great distance has tremendous redshift. B) Radiation from the hot gas of the big bang is calculated to have a redshift of about 10. C) The redshifts of different galaxies imply that these galaxies are moving toward each other. D) The redshifts of the most faint and distant galaxies known to date are about 1100.
The allowed values of n for the Li2+ ion are
a. 1 to ? b. 2 to ? c. 3 to ? d. any real number e. 1 to 10