728x90 HOOAI750 [PHYS] Example Question: A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire carrying a current I lie on a tabletop as shown in the figure below. Example Question # Question A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire carrying a current I lie on a tabletop as shown in the figure below. (a) Determine the magnetic flux through the loop due to the current I. (Use any variable stated above along with the following as necessary: 𝜇0 and 𝜋.) (b) Suppose the current is changing with time according .. 2022. 6. 25. [PHYS] Example Question: In Niels Bohr's 1913 model of the atom, the electron is in a circular orbit around a nucleus. An electron is 5.40 10-11 m from a nucleus traveling in a circular orbit with a speed of 2.50 106 m/s. Example Question # Question In Niels Bohr's 1913 model of the atom, the electron is in a circular orbit around a nucleus. An electron is 5.40*10^(-11) m from a nucleus traveling in a circular orbit with a speed of 2.50*10^6 m/s. What is the magnitude of the magnetic moment due to the electron's motion? # Explanation What is the magnitude of the magnetic moment due to the electron's motion? 2022. 6. 20. [PHYS] Example Question: For the circuit shown below, the ideal voltmeter reads 5.30 V and the ideal ammeter reads 2.60 mA. Find the following. Example Question # Question For the circuit shown below, the ideal voltmeter reads 5.30 V and the ideal ammeter reads 2.60 mA. Find the following. # Explanation 2022. 6. 20. [PHYS] Example Question: In the circuit of the figure below, the switch S has been open for a long time. It is then suddenly closed. Take e m f = 10.0 V, R1 = 42.0 kΩ, R2 = 120 kΩ, and C = 12.0 𝜇F. Example Question # Question In the circuit of the figure below, the switch S has been open for a long time. It is then suddenly closed. Take E = 10.0 V, R1 = 42.0 kΩ, R2 = 120 kΩ, and C = 12.0 𝜇F. Determine the time constant before the switch is closed. Determine the time constant after the switch is closed. Let the switch be closed at t = 0. Determine the current in the switch as a function of .. 2022. 6. 20. [PHYS] Example Question: A battery with e m f = 2.00 V and no internal resistance supplies current to the circuit shown in the figure below. When the double-throw switch S is open as shown in the figure, the current in the battery is 1.01 mA. When the s.. Example Question # Question A battery with E = 2.00 V and no internal resistance supplies current to the circuit shown in the figure below. When the double-throw switch S is open as shown in the figure, the current in the battery is 1.01 mA. When the switch is closed in position a, the current in the battery is 1.21 mA. When the switch is closed in position b, the current in the battery is 2.05 .. 2022. 6. 20. [PHYS] Example Question: Consider the circuit shown in the figure below. (Let R = 12.0 Ω.) Example Question # Question Consider the circuit shown in the figure below. (Let R = 12.0 Ω.) Find the current in the 12.0-Ω resistor. Find the potential difference between points a and b. # subTitle Find the current in the 12.0-Ω resistor. Find the potential difference between points a and b. 2022. 6. 20. [PHYS] Example Question: While taking photographs in Death Valley on a day when the temperature is 53.0°C, Bill Hiker finds that a certain voltage applied to a copper wire produces a current of 1.10 A. Bill then travels to Antarctica and applies the sa.. Example Question # Question While taking photographs in Death Valley on a day when the temperature is 53.0°C, Bill Hiker finds that a certain voltage applied to a copper wire produces a current of 1.10 A. Bill then travels to Antarctica and applies the same voltage to the same wire. What current does he register there if the temperature is −88.0°C? Assume that no change occurs in the wire's shap.. 2022. 6. 20. [PHYS] Example Question: Two capacitors, C1 = 6.06 µF and C2 = 3.22 µF, are connected in parallel, then the combination is connected to a 250 V battery. When the capacitors are charged, each one is removed from the circuit. Next, the two charged capac.. Example Question # Question Two capacitors, C1 = 6.06 µF and C2 = 3.22 µF, are connected in parallel, then the combination is connected to a 250 V battery. When the capacitors are charged, each one is removed from the circuit. Next, the two charged capacitors are connected to each other so that the positive plate of one capacitor is connected to the negative plate of the other capacitor. What is.. 2022. 6. 20. [PHYS] Example Question: A uniform electric field E = 2550 V/m exists within a certain region. What volume of space contains an energy equal to 1.10 ✕ 10-7 J? Express your answer in cubic meters and in liters. Example Question # Question A uniform electric field E = 2550 V/m exists within a certain region. What volume of space contains an energy equal to 1.10 ✕ 10-7 J? Express your answer in cubic meters and in liters. # Explanation 2022. 6. 20. [PHYS] Example Question: A nonconducting sphere has mass 80.8 g and radius 19.8 cm. A flat, compact coil of wire with seven turns is wrapped tightly around it, with each turn concentric with the sphere. The sphere is placed on an inclined plane that slo.. Example Question # Question A nonconducting sphere has mass 80.8 g and radius 19.8 cm. A flat, compact coil of wire with seven turns is wrapped tightly around it, with each turn concentric with the sphere. The sphere is placed on an inclined plane that slopes downward to the left (see figure below), making an angle 𝜃 with the horizontal so that the coil is parallel to the inclined plane. A unifo.. 2022. 6. 20. [PHYS] Example Question: The upper portion of the circuit in the figure below is fixed. The horizontal wire at the bottom has a mass of 10.0 g and is 5.00 cm long. This wire hangs in the gravitational field of the Earth from identical light springs conn.. Example Question # Question The upper portion of the circuit in the figure below is fixed. The horizontal wire at the bottom has a mass of 10.0 g and is 5.00 cm long. This wire hangs in the gravitational field of the Earth from identical light springs connected to the upper portion of the circuit. The springs stretch 0.540 cm under the weight of the wire, and the circuit has a total resistance o.. 2022. 6. 20. [PHYS] Example Question: A particle with positive charge q = 3.84 10-18 C moves with a velocity v with arrow = (5î + 4ĵ − k) m/s through a region where both a uniform magnetic field and a uniform electric field exist. Example Question # Question A particle with positive charge q = 3.84*10^-(18) C moves with a velocity v with arrow = (5î + 4ĵ − k) m/s through a region where both a uniform magnetic field and a uniform electric field exist. # Explanation A particle with positive charge q = 3.84*10^-(18) C moves with a velocity v with arrow = (5î + 4ĵ − k) m/s through a region where both a uniform magnetic field .. 2022. 6. 20. [PHYS] Example Question: A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the l.. Example Question # Question A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the left atrium of the heart and subject to this external magnetic field. The permanent magnet has a magnetic moment of 0.12 A · m2. The orientatio.. 2022. 6. 20. [PHYS] Example Question: In the figure below, the cube is 42.4 cm on each edge. Four straight segments of wire—ab, bc, cd, and da—form a closed loop that carries a current I = 5.30 A in the direction shown. A uniform magnetic field of magnitude B = .. Example Question # Question In the figure below, the cube is 42.4 cm on each edge. Four straight segments of wire—ab, bc, cd, and da—form a closed loop that carries a current I = 5.30 A in the direction shown. A uniform magnetic field of magnitude B = 0.022 T is in the positive y direction. Determine the magnetic force on each segment. ab bc cd da # Explanation ab bc cd da 2022. 6. 20. [PHYS] Example Question: A 290-W heating coil designed to operate from 110 V is made of Nichrome wire 0.230 mm in diameter. (Assume 𝜌 = 1.50 10-6 Ω · m, and 𝛼 = 4.000 10-4(°C)−1 for Nichrome.) Example Question # Question A 290-W heating coil designed to operate from 110 V is made of Nichrome wire 0.230 mm in diameter. (Assume 𝜌 = 1.50 * 10^(-6) Ω · m, and 𝛼 = 4.000 * 10^(-4)(°C)^(−1) for Nichrome.) (a) Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used. (b) Now consider the variation of resistivity with temperature. What power i.. 2022. 6. 20. [PHYS] Example Question: The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value. Example Question # Question The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value. (a) At this average price, calculate the cost of leaving a 40-W porch light on for two weeks while you are on vacation? (b) At this average price, calculate the cost of making a piece of dark toast in.. 2022. 6. 20. [PHYS] Example Question: The quantity of charge q (in coulombs) that has passed through a surface of area 2.05 cm2 varies with time according to the equation q = 7t^3 + 3t + 6, where t is in seconds. Example Question # Question The quantity of charge q (in coulombs) that has passed through a surface of area 2.05 cm^2 varies with time according to the equation q = 7t^3 + 3t + 6, where t is in seconds. (a) What is the instantaneous current through the surface at t = 0.900 s? (b) What is the value of the current density? # Explanation (a) What is the instantaneous current through the surface at.. 2022. 6. 20. [PHYS] Example Question: A 340-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,020 A. If the conductor is copper with a free charge density of 8.50 1028 electrons per cubic meter, how many years does it take one.. Example Question # Question A 340-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,020 A. If the conductor is copper with a free charge density of 8.50 * 10^(28) electrons per cubic meter, how many years does it take one electron to travel the full length of the cable? (Use 3.156 * 10^7 for the number of seconds in a year.) # Explanation 2022. 6. 20. [PHYS] Example Question: The figure below represents a section of a circular conductor of nonuniform diameter carrying a current of I = 5.40 A. The radius of cross-section A1 is r1 = 0.230 cm. Example Question # Question The figure below represents a section of a circular conductor of nonuniform diameter carrying a current of I = 5.40 A. The radius of cross-section A1 is r1 = 0.230 cm. What is the magnitude of the current density across A1? Specify the radius at A2. Specify the current at A2. Specify the current density at A2. # Explanation What is the magnitude of the current density.. 2022. 6. 20. [PHYS] Example Question: Two conductors having net charges of +16.0 µC and -16.0 µC have a potential difference of 16.0 V between them. Example Question # Question Two conductors having net charges of +16.0 µC and -16.0 µC have a potential difference of 16.0 V between them. (a) Determine the capacitance of the system. (b) What is the potential difference between the two conductors if the charges on each are increased to +256.0 µC and -256.0 µC? # Explanation (a) Determine the capacitance of the system. (b) What is the potential .. 2022. 6. 20. [PHYS] Example Question: A 56.0-m length of coaxial cable has an inner conductor that has a diameter of 2.58 mm and carries a charge of 8.10 µC. The surrounding conductor has an inner diameter of 7.27 mm and a charge of −8.10 µC. Example Question # Question A 56.0-m length of coaxial cable has an inner conductor that has a diameter of 2.58 mm and carries a charge of 8.10 µC. The surrounding conductor has an inner diameter of 7.27 mm and a charge of −8.10 µC. (a) What is the capacitance of this cable? (b) What is the potential difference between the two conductors? # Explanation (a) What is the capacitance of this cable? .. 2022. 6. 20. [PHYS] Example Question: Two identical parallel-plate capacitors, each with capacitance 18.0 𝜇F, are charged to potential difference 47.0 V and then disconnected from the battery. They are then connected to each other in parallel with plates of like .. Example Question # Quesiton Two identical parallel-plate capacitors, each with capacitance 18.0 𝜇F, are charged to potential difference 47.0 V and then disconnected from the battery. They are then connected to each other in parallel with plates of like sign connected. Finally, the plate separation in one of the capacitors is doubled. Find the total energy of the system of two capacitors before t.. 2022. 6. 20. [PHYS] Example Question: Find the equivalent capacitance between points a and b in the combination of capacitors shown in the figure below. (C1 = 7.0 µF and C2 = 6.0 µF.) Example Question # Question Find the equivalent capacitance between points a and b in the combination of capacitors shown in the figure below. (C1 = 7.0 µF and C2 = 6.0 µF.) # Explanation # Answer A) 15.7 2022. 6. 20. [PHYS] Example Question: Consider the circuit shown in the figure below, where C1 = 8.00 µF, C2 = 6.00 µF, and ΔV = 22.0 V. Capacitor C1 is first charged by closing switch S1. Switch S1 is then opened, and the charged capacitor is connected to the un.. Example Question # Question Consider the circuit shown in the figure below, where C1 = 8.00 µF, C2 = 6.00 µF, and ΔV = 22.0 V. Capacitor C1 is first charged by closing switch S1. Switch S1 is then opened, and the charged capacitor is connected to the uncharged capacitor by closing S2. Calculate the initial charge (in µC) acquired by C1. Calculate the final charge (in µC) on each capacitor. After.. 2022. 6. 20. [PHYS] Example Question: An isolated charged conducting sphere has a radius R = 11.0 cm. At a distance of r = 19.0 cm from the center of the sphere the electric field due to the sphere has a magnitude of E = 4.90 ✕ 104 N/C. Example Question # Example Question An isolated charged conducting sphere has a radius R = 11.0 cm. At a distance of r = 19.0 cm from the center of the sphere the electric field due to the sphere has a magnitude of E = 4.90 ✕ 104 N/C. What is its surface charge density (in µC/m2)? What is its capacitance (in pF)? A larger sphere of radius 23.0 cm is now added so as to be concentric with the firs.. 2022. 6. 20. [HOO's INFO] 크롬 창을 실수로 닫았을 때 바로 복구하는 키: Ctrl + Shift + T 크롬 창을 실수로 닫았을 때 바로 복구하는 키: Ctrl + Shift + T 크롬(Chrome) 창을 사용하다가 실수로 닫아서 화가 나는 경우가 종종 있다. 특히 화면 분할로 코딩 작업을 하다가 이러한 경우가 종종 발생하는데 단축키를 통해 이전 창 복구가 바로 가능하다. Ctrl + Shift + T 를 입력하면 된다. 우리 모두 화나지 않는 행복한 코딩 생활을 위하여! 2022. 6. 17. [HOO's LIFE] 미국 CS 전공 유학생이 알고 있어야 하는 프로그래밍 언어 미국 CS 전공 유학생이 알고 있어야 하는 프로그래밍 언어 미국 대학교를 다니고 있는 CS 전공자 학부생이라면 공통적으로 학교에서 쓰는 프로그래밍 언어가 있다. 사실 CS 전공으로 대학교를 오는 대부분의 학생들이 고민하는 것 중에 하나가 프로그래밍 언어이다. 미리 프로그래밍 언어를 공부하고 싶지만 도대체 어떤 언어를 먼저 공부해야 하는지에 대해서 고민을 많이 한다. CS 전공 뿐만 아니라 컴퓨터 관련 학과를 가는 Bro들도 필자에게 프로그래밍 언어에 대한 질문을 많이 하는 편이다. 문제는 국내 대학교에는 물어볼 사람이 많지만 미국 대학교에 대한 정보는 상대적으로 많지 않다는 것이다. CS 전공으로 미국 유학을 준비하거나 시작한 학생들에게 도움이 되길 바라며 필자의 경험에서 느낀 학부생 때 필요한 프로그래.. 2022. 6. 16. [HOO's LIFE] 미국 대학교에서 컴퓨터 사이언스(CS) 전공으로 전과 미국 대학교에서 컴퓨터 사이언스(CS) 전공으로 전과 # 전과가 쉬운 미국 대학교 과거와 달리 많은 유학생들이 컴퓨터 관련 전공으로 입학하거나 전과하는 경우가 많아졌다. 미국의 경우에는 한국과 달리 전과가 다소 쉽다 보니 컴퓨터 관련 전공으로 전과를 많이 하는 편이다. 특히 필자의 학교에 경우에는 Engineering에서 원하는 전공으로 바로 갈 수가 없다. 필수 엔지니어링 수업을 모두 이수해야지만 자신에게 맞는 전공을 선택하여 수업을 들을 수 있는 시스템이다. 다른 많은 미국 학교에서도 공학 계열 전공들은 이런 식으로 단계를 나눠서 학생을 평가하고 전공을 따라갈 수 있는 충분한 기본 능력을 입증한 뒤에 학생이 원하는 전공을 들을 수 있게 되어 있다. 그렇다 보니 공통 수업에서 컴퓨터 수업을 들어보고 자.. 2022. 6. 16. [데이터 사이언스] 캐글 프로젝트(Kaggle Project): Foursquare - Location Matching 캐글 프로젝트(Kaggle Project): Foursquare - Location Matching 포스트 난이도: HOO_Senior [Notice] 포스트 난이도에 대한 설명 안녕하세요, HOOAI의 Henry입니다. Bro들의 질문에 대한 내용을 우선적으로 포스팅이 되다 보니 각각의 포스트에 대한 난이도가 달라서 난이도에 대한 부분을 작성하면 좋겠다는 의견을 들었습니다 whoishoo.tistory.com # Kaggle Project 캐글 프로젝트(Kaggle project)는 Data science에 대한 공부와 프로젝트 또는 Competition을 참여할 수 있는 커뮤니티 사이트이다. 프로젝트에 직접 참여하지 않더라도 캐글 사이트에서 Data science를 공부하기에도 충분히 괜찮은 사이트이.. 2022. 6. 11. [알고리즘] Machine Learning Algorithm: Random Forest Machine Learning Algorithm: Random Forest 포스트 난이도: HOO_Middle [Notice] 포스트 난이도에 대한 설명 안녕하세요, HOOAI의 Henry입니다. Bro들의 질문에 대한 내용을 우선적으로 포스팅이 되다 보니 각각의 포스트에 대한 난이도가 달라서 난이도에 대한 부분을 작성하면 좋겠다는 의견을 들었습니다 whoishoo.tistory.com # Random Forest Algorithm 랜덤 포레스트 알고리즘(Random forest algorithm)은 기계 학습(Machine learning)에서 사용되는 분류와 회귀 분석을 위한 알고리즘 종류 중 하나이다. Machine learning을 통해 수많은 데이터를 분류한다는 것은 중요한 기능 중에 하나이다... 2022. 6. 9. 이전 1 ··· 12 13 14 15 16 17 18 ··· 25 다음 728x90
