Let the charge density in a certain region of space be ?. The electric field 
in that region points in the +x direction with 
= constant. This implies
A. that ? is positive in that region.
B. that ? is negative in that region.
C. that ? is zero in that region.
D. that the field is physically impossible.
E. nothing useful about the region’s charge density.
C. that ? is zero in that region.
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Free Fall: A foul ball is hit straight up into the air with a speed of 30 m/s, and air resistance is negligible.(a) Calculate the time required for the ball to rise to its maximum height.(b) Calculate the maximum height reached by the ball above the point where it hit the bat.(c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat.(d) Explain why there are two answers to part (c).
What will be an ideal response?
An archaeologist finds the 14C in a sample of 3.10 g of material to be decaying at 107 counts per second. A modern 1.00-g sample of the same material decays at 151 counts per second. The half-life of 14C is 5730 y. How old is the sample?
A) 12,200 y B) 8460 y C) 25,100 y D) 12,600 y
The amount of diffraction a telescope creates depends upon:
A) whether the telescope is a refractor or a reflector. B) the wavelength and the diameter of the telescope objective. C) the magnification of the eyepiece. D) the types of glass used in the achromat. E) the transparency of the atmosphere.
Which of the following lists foliated metamorphic rocks is in order from lowest to highest grade?
What will be an ideal response?