Author: Anonymous

What does -n do in sed -n ‘s/abc/xyz/p’? [Select all that apply.]

Which of the following are required components of a case statement? [Select all that apply.]

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