An automobile travels due north with a constant speed of 81 km/h. All forces considered, the unbalanced force acting on the auto is
a. zero.
b. southward.
c. northward.
d. downward.
e. upward.
a
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If the rms value of the electric field is 9.0 V/m at a distance of 6.0 m from an isotropic source, what is the rms value of the magnetic field at a distance of 12 m from the source?
a. 
b. 
c. 
d. 
e. 
Arrange the following distances in order from smallest to largest. I. kilometer II. light-year III. yard IV. Astronomical unit
a. I, II, III, IV b. IV, III, II, I c. III, I, IV, II d. II, I, IV, III e. III, I, II, IV
The objective lens of a microscope
A. Focuses diverging rays from the object into a real image B. Focuses parallel rays from the object into a real image C. Focuses diverging rays from the object into a virtual image D. Focuses parallel rays from the object into a virtual image
Protostars have not been observed, but are consistent with observations of young main sequence stars
Indicate whether the statement is true or false