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미국 개발자258

[PHYS] Example Question: Two protons in a molecule are 3.50 10-10 m apart. Find the electric force exerted by one proton on the other. Example Question # Question Two protons in a molecule are 3.50*10^(-10)m apart. Find the electric force exerted by one proton on the other. State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other. What must be a particle's charge-to-mass ratio if the magnitude of the gravitational force between two of these particles is equa.. 2022. 7. 1.
[HOO's Life] 발표를 정말 많이 하는 미국 CS 전공 유학생 발표를 정말 많이 하는 미국 CS 전공 유학생 # 미국 CS 전공자 우선 미국 대학교에서는 한국보다도 발표를 정말 중요하게 생각하고 많이 한다는 건 알려진 사실이다. 그런데 CS(Computer Science) 전공자인 경우에도 발표가 정말 많고 중요하다. CS 전공자가 발표할 일이 뭐가 있냐 싶겠지만 학부 때 수업마다 발표를 정말 많이 시킨다. CS 전공 수업에는 대부분 수업 프로젝트가 포함되어 있는데, 여기서 만드는 프로그램이나 특정 연구 프로젝트에 대한 부분을 발표해야 한다. 물론 Business 계열 학과의 경우 매일이 토론과 발표라고 하지만, CS 전공자의 경우에도 발표를 정말 많이 하는 편이다. # 수업마다 발표는 필수이다. 미국에서 CS 전공으로 유학하는 학생들의 경우에는 발표를 두려워해서는.. 2022. 6. 29.
[HOO's Life] 미국 유학생의 미국 개발자 취업 미국 유학생의 미국 개발자 취업 # CS 전공 미국 유학생 한국에서 개발자로 일하기 위해서나 별도의 오퍼를 받고 미국으로 오는 케이스도 있지만 필자가 이번 포스트에서 이야기를 나눌 주제는 미국 유학생이 졸업 후에 미국 개발자로 취업하기 위해서 준비해야 하는 것들이다. 사실 취업에 필요한 구체적인 자료는 충분히 검색이나 직접 물어봄으로써 정해진 규정대로 준비하면 된다. 필자가 이야기하고 싶은 부분은 컴퓨터 전공, 특히 필자가 나온 CS 전공에서 졸업 전에 미국 유학생이 준비해야 하는 것들이다. 준비만 된다면 CS 학부생 나름 좋은 대학교 기준으로 대부분은 테슬라, 구글, 아마존 등과 같은 대기업에 입사하는 편이다. CS 전공이라도 학교마다 집중하는 분야가 각기 다르기 때문에 보통 한 회사로 집중되는 성향을.. 2022. 6. 28.
[PHYS] Example Question: A sinusoidal voltage Δv = 37.5 sin(100t), where Δv is in volts and t is in seconds, is applied to a series RLC circuit with L = 170 mH, C = 99.0 µF, and R = 74.0 Ω. Example Question # Question A sinusoidal voltage Δv = 37.5 sin(100t), where Δv is in volts and t is in seconds, is applied to a series RLC circuit with L = 170 mH, C = 99.0 µF, and R = 74.0 Ω. What is the impedance (in Ω) of the circuit? What is the maximum current (in A)? Determine the numerical value for 𝜔 (in rad/s) in the equation i = Imax sin(𝜔t − 𝜑). Determine the numerical value for 𝜑 (in.. 2022. 6. 27.
Example Question: On a printed circuit board, a relatively long, straight conductor and a conducting rectangular loop lie in the same plane as shown in the figure below. Taking h = 0.300 mm, w = 1.20 mm, and ℓ = 2.20 mm, find their mutual inductance. Example Question # Question On a printed circuit board, a relatively long, straight conductor and a conducting rectangular loop lie in the same plane as shown in the figure below. Taking h = 0.300 mm, w = 1.20 mm, and ℓ = 2.20 mm, find their mutual inductance. # Explanation 2022. 6. 27.
[PHYS] Example Question: Two coils are close to each other. The first coil carries a current given by i(t) = 5.80e−0.0250t sin 120𝜋t, where i is in amperes and t is in seconds. At t = 0.855 s, the emf measured across the second coil is −2.90 V. W.. Example Question # Question Two coils are close to each other. The first coil carries a current given by i(t) = 5.80e−0.0250t sin120𝜋t, where i is in amperes and t is in seconds. At t = 0.855 s, the emf measured across the second coil is −2.90 V. What is the mutual inductance of the coils? # Explanation 2022. 6. 27.
[PHYS] Example Question: In a certain series RLC circuit, Irms = 9.00 A, ΔVrms = 245 V, and the current leads the voltage by 30.0°. Example Question # Question In a certain series RLC circuit, Irms = 9.00 A, ΔVrms = 245 V, and the current leads the voltage by 30.0°. What is the total resistance (in Ω) of the circuit? Calculate the reactance (in Ω) of the circuit (XL − XC). # Explanation What is the total resistance (in Ω) of the circuit? Calculate the reactance (in Ω) of the circuit (XL − XC). 2022. 6. 27.
[PHYS] Example Question: The switch in the figure below is open for t < 0 and is then thrown closed at time t = 0. Assume R = 2.00 Ω, L = 9.00 H, and e m f = 12.0 V. Find the following as functions of time thereafter. (Do not enter units in your answer.. Example Question # Question The switch in the figure below is open for t < 0 and is then thrown closed at time t = 0. Assume R = 2.00 Ω, L = 9.00 H, and e m f = 12.0 V. Find the following as functions of time thereafter. # Explanation 2022. 6. 27.
[PHYS] Example Question: Consider the circuit shown in the figure below where L = 5.50 mH and R2 = 465 Ω. Example Question # Question Consider the circuit shown in the figure below where L = 5.50 mH and R2 = 465 Ω. (a) When the switch is in position a, for what value of R1 will the circuit have a time constant of 15.3 µs? (b) What is the current in the inductor at the instant the switch is thrown to position b? # Explanation (a) When the switch is in position a, for what value of R1 will the circuit.. 2022. 6. 27.
[PHYS] Example Question: An LC circuit like that in the figure below consists of a 3.30-H inductor and an 834-pF capacitor that initially carries a 122-𝜇C charge. The switch is open for t < 0 and is then thrown closed at t = 0. Compute the following .. Example Question # Question An LC circuit like that in the figure below consists of a 3.30-H inductor and an 834-pF capacitor that initially carries a 122-𝜇C charge. The switch is open for t < 0 and is then thrown closed at t = 0. Compute the following quantities at t = 5.00 ms. the energy stored in the capacitor the total energy in the circuit the energy stored in the inductor # Explanation the.. 2022. 6. 27.
[PHYS] Example Question: In the figure below, let R = 7.50 Ω, L = 2.10 mH, and C = 1.90 µF. Example Question # Question In the figure below, let R = 7.50 Ω, L = 2.10 mH, and C = 1.90 µF. (a) Calculate the frequency of the damped oscillation of the circuit when the switch is thrown to position b. (b) What is the critical resistance for damped oscillations? # Explanation 2022. 6. 27.
[PHYS] Example Question: A 102-turn square coil of side 20.0 cm rotates about a vertical axis at w = 1.25*10^3 rev/min as indicated in the figure below. The horizontal component of Earth's magnetic field at the coil's location is equal to 2.00*10^(-5)T. Example Question # Question A 102-turn square coil of side 20.0 cm rotates about a vertical axis at w = 1.25*10^3 rev/min as indicated in the figure below. The horizontal component of Earth's magnetic field at the coil's location is equal to 2.00*10^(-5)T. # Explanation 2022. 6. 26.
[PHYS] Example Question: A rectangular loop of area A = 0.150 m2 is placed in a region where the magnetic field is perpendicular to the plane of the loop. The magnitude of the field is allowed to vary in time according to B = 0.400e−t/2.00, where B is.. Example Question # Question A rectangular loop of area A = 0.150 m2 is placed in a region where the magnetic field is perpendicular to the plane of the loop. The magnitude of the field is allowed to vary in time according to B = 0.400e−t/2.00, where B is in teslas and t is in seconds. The field has the constant value 0.400 T for t < 0. What is the value for eplison at t = 8.000 s? # Explanation 2022. 6. 26.
[PHYS] Example Question: The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, an outer conductor, and another rubber layer. In a particular application, the current in the inner conductor i.. Example Question # Question The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, an outer conductor, and another rubber layer. In a particular application, the current in the inner conductor is I1 = 1.12 A out of the page and the current in the outer conductor is I2 = 3.12 A into the page. Assuming the distance d = 1.00 mm, answer t.. 2022. 6. 26.
[PHYS] Example Question: In the figure below, the current in the long, straight wire is I1 = 7.00 A and the wire lies in the plane of the rectangular loop, which carries a current I2 = 10.0 A. The dimensions in the figure are c = 0.100 m, a = 0.150 m, a.. Example Question # Question In the figure below, the current in the long, straight wire is I1 = 7.00 A and the wire lies in the plane of the rectangular loop, which carries a current I2 = 10.0 A. The dimensions in the figure are c = 0.100 m, a = 0.150 m, and L = 0.460 m. Find the magnitude and direction of the net force exerted on the loop by the magnetic field created by the wire. # Explanation 2022. 6. 26.
[PHYS] Example Question: Two long, parallel wires carry currents of I1 = 3.35 A and I2 = 4.60 A in the directions indicated in the figure below, where d = 25.0 cm. (Take the positive x direction to be to the right.) Example Question # Question Two long, parallel wires carry currents of I1 = 3.35 A and I2 = 4.60 A in the directions indicated in the figure below, where d = 25.0 cm. (Take the positive x direction to be to the right.) Find the magnitude and direction of the magnetic field at a point midway between the wires. # Explanation Find the magnitude and direction of the magnetic field at a point midway .. 2022. 6. 26.
[PHYS] Example Question: A current path shaped as shown in the figure produces a magnetic field at P, the center of the arc. If the arc subtends an angle of 𝜃 = 25.0° and the radius of the arc is 0.400 m, what are the magnitude and direction of the .. Example Question # Question A current path shaped as shown in the figure produces a magnetic field at P, the center of the arc. If the arc subtends an angle of 𝜃 = 25.0° and the radius of the arc is 0.400 m, what are the magnitude and direction of the field produced at P if the current is 3.00 A? # Explanation 2022. 6. 26.
[PHYS] Example Question: A conductor consists of a circular loop of radius R = 30.0 cm and two long, straight sections as shown in the figure below. The wire lies in the plane of the screen and carries a current I = 2.70 A. Find the magnetic field at th.. Example Question # Question A conductor consists of a circular loop of radius R = 30.0 cm and two long, straight sections as shown in the figure below. The wire lies in the plane of the screen and carries a current I = 2.70 A. Find the magnetic field at the center of the loop. # Exaplanation 2022. 6. 26.
[PHYS] Example Question: (a) A conducting loop in the shape of a square of edge length ℓ = 0.380 m carries a current I = 10.2 A as in the figure above. Calculate the magnitude and direction of the magnetic field at the center of the square. Example Question # Question (a) A conducting loop in the shape of a square of edge length ℓ = 0.380 m carries a current I = 10.2 A as in the figure above. Calculate the magnitude and direction of the magnetic field at the center of the square. (b) If this conductor is reshaped to form a circular loop and carries the same current, what is the value of the magnetic field at the center? # Explanati.. 2022. 6. 26.
[PHYS] Example Question: A technician wearing a brass bracelet enclosing area 0.00500 m2 places her hand in a solenoid whose magnetic field is 2.00 T directed perpendicular to the plane of the bracelet. The electrical resistance around the circumference.. Example Question # Question A technician wearing a brass bracelet enclosing area 0.00500 m2 places her hand in a solenoid whose magnetic field is 2.00 T directed perpendicular to the plane of the bracelet. The electrical resistance around the circumference of the bracelet is 0.0200 ohm. An unexpected power failure causes the field to drop to 0.60 T in a time of 24.0 ms. (a) Find the current indu.. 2022. 6. 25.
[PHYS] Example Question: The figure below shows a bar of mass m = 0.280 kg that can slide without friction on a pair of rails separated by a distance ℓ = 1.20 m and located on an inclined plane that makes an angle 𝜃 = 26.0° with respect to the gro.. Example Question # Question The figure below shows a bar of mass m = 0.280 kg that can slide without friction on a pair of rails separated by a distance ℓ = 1.20 m and located on an inclined plane that makes an angle 𝜃 = 26.0° with respect to the ground. The resistance of the resistor is R = 3.90 Ω and a uniform magnetic field of magnitude B = 0.500 T is directed downward, perpendicular to the g.. 2022. 6. 25.
[PHYS] Example Question: A toroid having a rectangular cross section (a = 2.00 cm by b = 3.00 cm) and inner radius R = 3.75 cm consists of 500 turns of wire that carries a sinusoidal current I = Imax sin 𝜔t, with Imax = 55.0 A and a frequency f = .. Example Question # Question A toroid having a rectangular cross section (a = 2.00 cm by b = 3.00 cm) and inner radius R = 3.75 cm consists of 500 turns of wire that carries a sinusoidal current I = Imax sin 𝜔t, with Imax = 55.0 A and a frequency f = 𝜔/2𝜋 = 60.0 Hz. A coil that consists of 20 turns of wire links with the toroid, as shown in the figure. Determine the emf induced in the coil as a f.. 2022. 6. 25.
[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.
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