Author: Anonymous

Which users can perform privileged operations in Linux? [Select all that apply.]

Which of the following statements about BEGIN and END blocks in AWK are true? [Select all that apply.]

Which of these are correct uses of tar? [Select all that apply.]

Which of the following are redirection operators? [Select all that apply.]

The critical angle for total internal reflection at a diamond-air interface is 25°. Suppose light is incident at an angle of θ with the normal. Total internal reflection will occur if the incident medium is:

Consider the three electric charges shown in the figure. List the charges in order of the magnitude of the force they experience, starting with the greatest. fig_q2_final.jpg

Three point charges, Q 1 = Q 2 = + 3 . 00 × 10 – 9   C  and Q 3 = – 2 . 00 × 10 – 9   C , are located on a circular arc of radius R = 4 . 00   c m  with center O at ( 0 ,   0 ) c m , as shown in Fig. 1.1. (a) What is the total electric field at the center of the arc? (b) Find the magnitude and direction of the electric force that would be exerted on a q = – 5 . 00 × 10 – 9   C  point charge placed at O. (c) What would be the work done by electric force if q  is moved from point O to point P ( – 2 . 00 ,   0 ) c m ? Two identical spherical shells (M and N) of radius 4 . 00   c m  are added in space with the center of shell M at ( 3 . 00 ,   0 ) c m  and shell N at ( 0 ,   9 . 00 ) c m , as shown in Fig. 1.2. If + 5 . 00 × 10 – 9   C  and – 5 . 00 × 10 – 9   C  are uniformly distributed on M and N, respectively. (d) What are the magnitude and direction of electric field at point O contributed by Q 1 , Q 2 , Q 3 , and the charges on M and N? (e) Find the electric force that would be exerted on a q = – 5 . 00 × 10 – 9   C  point charge placed at O. fig_q17_final.jpg

Consider the paths of particles 1, 2, 3. If these particles have the same charge and mass, which is moving most slowly? fig_q10_final.jpg

Consider the circuit shown in the figure, in which three light bulbs, each with a resistance R , are connected in series. Name the light bulb on top of the circuit as 1, the light bulb in the middle as 2, and the light bulb on the bottom as 3. What happen to the intensities of the three light bulbs when the switch is closed? fig_q9_final.jpg

Suppose the conducting shell in the figure, which has a point charge Q at its center, has a nonzero net charge Q . How much charge is on the inner and outer surface of the shell, respectively? fig_q6_final.jpg