A long nonconducting cylinder (radius = 6.0 mm) has a nonuniform volume charge density given by ?r2, where ? = 6.2 mC/m5 and r is the distance from the axis of the cylinder. What is the magnitude of the electric field at a point 2.0 mm from the axis?
a. 1.4 N/C
b. 1.6 N/C
c. 1.8 N/C
d. 2.0 N/C
e. 5.4 N/C
a
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Which of the following statements does not use the term light-year in an appropriate way?
A) It will take me light-years to complete this homework assignment. B) It's about 4 light-years from here to Alpha Centauri. C) A light-year is about 10 trillion kilometers. D) It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year. E) The Milky Way Galaxy is about 100,000 light-years in diameter.
Suppose Earth collapsed down to one-hundredth [1/100] of its present radius. How would this affect your weight? Your weight would be
A) increased by a factor of 100. B) increased by a factor of 1000. C) increased by a factor of 10,000. D) unchanged. E) reduced by a factor of 100.
Changes that do not alter the chemical composition of a substance are called ______________ changes
Fill in the blank(s) with correct word
Estimate the radius of a nucleus with mass 50 u. (mneutron ? mproton = 1.67 × 10-27 kg)
A) about 8.5 fm B) about 3.7 fm C) about 4.4 fm D) about 6.2 fm