An automobile travels due north with a speed of 93 km/h and an acceleration of 1.6 m/s2. All forces considered, the unbalanced force acting on the auto is
a. zero.
b. southward.
c. northward.
d. downward.
e. upward.
Answer: c. northward.
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The line intensity of a spectrum depends both on the abundance of a particular element and its temperature as well
Indicate whether the statement is true or false
A point charge +Q is located on the x axis at x = a, and a second point charge ?Q is located on the x axis at x = ?a. A Gaussian surface with radius r = 2a is centered at the origin. The flux through this Gaussian surface is
A. zero because the negative flux over one hemisphere is equal to the positive flux over the other. B. greater than zero. C. zero because at every point on the surface the electric field has no component perpendicular to the surface. D. zero because the electric field is zero at every point on the surface. E. none of the above.
Planet Z-34 has a mass equal to one-third that of Earth and a radius equal to one-third that of Earth. With g representing, as usual, the free-fall acceleration at the surface of Earth, the free-fall acceleration at the surface of Z-34 is
A) g/3. B) 3g. C) 6g. D) g/9. E) 9g.
The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. In each figure the spacing d between the slits is the same. Which figure(s) represent(s) slits illuminated with light of the greatest wavelength ?? The white spaces represent the interference maxima
a.
I.
b.
II.
c.
III.
d.
IV.
e.
V.