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Homework 1 (Homework) Vanessa Amador Introduction to General Physics II – PHYS 1022, section 001, Fall 2013 Instructor: Nikolaos Sparveris Current Score : – / 16 Due : Saturday, September 28 2013 06:00 PM EDT 1. –/1 points SerCP9 15.P.001. A 7.10 nC charge is located 1.64 m from a 3.94 nC point charge. (a) Find the magnitude of the electrostatic force that one charge exerts on the other. N (b) Is the force attractive or repulsive? attractive repulsive 2. –/2 points SerCP9 15.P.026. Three point charges are located on a circular arc as shown in the figure below. (Let r = 4.32 cm. Let to the right be the +x direction and up along the screen be the +y direction.) (a) What is the total electric field at P, the center of the arc? = + (b) Find the electric force that would be exerted on a point charge placed at P. = + WebAssign −5.2 nC Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 1 of 6 9/27/2013 8:41 PM 3. –/2 points SerCP9 15.P.044. A charge q = +3.53 μC is located at the center of a regular tetrahedron (a four-sided surface) as in figure below. (a) Find the total electric flux through the tetrahedron. N · m 2 /C (b) Find the electric flux through one face of the tetrahedron. N · m2/C Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 2 of 6 9/27/2013 8:41 PM 4. –/1 points SerCP9 15.P.051.WI. Three point charges are aligned along the x-axis as shown in the figure below. Find the electric field at the position x = +2.2 m, y = 0. magnitude N/C direction: The field is in the +y direction. The field is in the −x direction. The field is in the −y direction. The field is in the +x direction. There is no field at the position x = +2.2 m, y = 0. 5. –/3 points SerCP9 16.P.002. A proton is released from rest in a uniform electric field of magnitude 397 N/C. (a) Find the electric force on the proton. magnitude N direction (b) Find the acceleration of the proton. magnitude m/s 2 direction (c) Find the distance it travels in 2.04 μs. cm Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 3 of 6 9/27/2013 8:41 PM 6. –/1 points SerCP9 16.P.005.soln. The potential difference between the accelerating plates of a TV set is about 30 kV. If the distance between the plates is 1.9 cm, find the magnitude of the uniform electric field in the region between the plates. N/C 7. –/2 points SerCP9 16.P.013.soln. Consider the following figure. (a) Find the electric potential, taking zero at infinity, at the upper right corner (the corner without a charge) of the rectangle in the figure. (Let y = 3.5 cm and x = 5.8 cm.) J/C (b) Repeat if the 2.00-μC charge is replaced with a charge of −2.00 μC. J/C Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 4 of 6 9/27/2013 8:41 PM 8. –/1 points SerCP9 16.P.023.WI. In Rutherford’s famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 × 10−27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the gold nucleus, is fired at 2.0 10 7 m/s directly toward the nucleus, as in the figure below. How close does the alpha particle get to the gold nucleus before turning around? Assume the gold nucleus remains stationary. m Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 5 of 6 9/27/2013 8:41 PM 9. –/3 points SerCP9 16.P.037. For the system of capacitors shown in the figure below, find the following. (Let C 1 = 4.00 μF and C 2 = 8.00 μF.) (a) the equivalent capacitance of the system μF (b) the charge on each capacitor on C 1 μC on C 2 μC on the 6.00 μF capacitor μC on the 2.00 μF capacitor μC (c) the potential difference across each capacitor across C 1 V across C 2 V across the 6.00 μF capacitor V across the 2.00 μF capacitor V Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 6 of 6 9/27/2013 8:41 PM

## Homework 1 (Homework) Vanessa Amador Introduction to General Physics II – PHYS 1022, section 001, Fall 2013 Instructor: Nikolaos Sparveris Current Score : – / 16 Due : Saturday, September 28 2013 06:00 PM EDT 1. –/1 points SerCP9 15.P.001. A 7.10 nC charge is located 1.64 m from a 3.94 nC point charge. (a) Find the magnitude of the electrostatic force that one charge exerts on the other. N (b) Is the force attractive or repulsive? attractive repulsive 2. –/2 points SerCP9 15.P.026. Three point charges are located on a circular arc as shown in the figure below. (Let r = 4.32 cm. Let to the right be the +x direction and up along the screen be the +y direction.) (a) What is the total electric field at P, the center of the arc? = + (b) Find the electric force that would be exerted on a point charge placed at P. = + WebAssign −5.2 nC Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 1 of 6 9/27/2013 8:41 PM 3. –/2 points SerCP9 15.P.044. A charge q = +3.53 μC is located at the center of a regular tetrahedron (a four-sided surface) as in figure below. (a) Find the total electric flux through the tetrahedron. N · m 2 /C (b) Find the electric flux through one face of the tetrahedron. N · m2/C Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 2 of 6 9/27/2013 8:41 PM 4. –/1 points SerCP9 15.P.051.WI. Three point charges are aligned along the x-axis as shown in the figure below. Find the electric field at the position x = +2.2 m, y = 0. magnitude N/C direction: The field is in the +y direction. The field is in the −x direction. The field is in the −y direction. The field is in the +x direction. There is no field at the position x = +2.2 m, y = 0. 5. –/3 points SerCP9 16.P.002. A proton is released from rest in a uniform electric field of magnitude 397 N/C. (a) Find the electric force on the proton. magnitude N direction (b) Find the acceleration of the proton. magnitude m/s 2 direction (c) Find the distance it travels in 2.04 μs. cm Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 3 of 6 9/27/2013 8:41 PM 6. –/1 points SerCP9 16.P.005.soln. The potential difference between the accelerating plates of a TV set is about 30 kV. If the distance between the plates is 1.9 cm, find the magnitude of the uniform electric field in the region between the plates. N/C 7. –/2 points SerCP9 16.P.013.soln. Consider the following figure. (a) Find the electric potential, taking zero at infinity, at the upper right corner (the corner without a charge) of the rectangle in the figure. (Let y = 3.5 cm and x = 5.8 cm.) J/C (b) Repeat if the 2.00-μC charge is replaced with a charge of −2.00 μC. J/C Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 4 of 6 9/27/2013 8:41 PM 8. –/1 points SerCP9 16.P.023.WI. In Rutherford’s famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 × 10−27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the gold nucleus, is fired at 2.0 10 7 m/s directly toward the nucleus, as in the figure below. How close does the alpha particle get to the gold nucleus before turning around? Assume the gold nucleus remains stationary. m Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 5 of 6 9/27/2013 8:41 PM 9. –/3 points SerCP9 16.P.037. For the system of capacitors shown in the figure below, find the following. (Let C 1 = 4.00 μF and C 2 = 8.00 μF.) (a) the equivalent capacitance of the system μF (b) the charge on each capacitor on C 1 μC on C 2 μC on the 6.00 μF capacitor μC on the 2.00 μF capacitor μC (c) the potential difference across each capacitor across C 1 V across C 2 V across the 6.00 μF capacitor V across the 2.00 μF capacitor V Homework 1 http://www.webassign.net/web/Student/Assignment-Responses/last?dep… 6 of 6 9/27/2013 8:41 PM

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A crush of popular social-media toys – Facebook, Twitter, Google, Yahoo, Yelp, social games, Skype, YouTube and Quora, to name a few – has opened the lines of communication between millions of people as never before. But the glut of tools and their features – chat, messages, instant messages, texting and tweets – has led to multiple conversations that can be head-spinning. People are drowning in a deluge of data. Corporate users received about 110 messages a day in 2010, says market researcher Radicati Group. There are 110 million tweets a day, Twitter says. Researcher Basex has pegged business productivity losses due to the “cost of unnecessary interruptions” at \$650 billion in 2007. What can you do to manage social media? Is there a way to use social media in a positive way in the workplace?

## A crush of popular social-media toys – Facebook, Twitter, Google, Yahoo, Yelp, social games, Skype, YouTube and Quora, to name a few – has opened the lines of communication between millions of people as never before. But the glut of tools and their features – chat, messages, instant messages, texting and tweets – has led to multiple conversations that can be head-spinning. People are drowning in a deluge of data. Corporate users received about 110 messages a day in 2010, says market researcher Radicati Group. There are 110 million tweets a day, Twitter says. Researcher Basex has pegged business productivity losses due to the “cost of unnecessary interruptions” at \$650 billion in 2007. What can you do to manage social media? Is there a way to use social media in a positive way in the workplace?

Social media use in the workplace is ordinary, of uncertain … Read More...