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Duarte Gomes

Duarte G.

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Books Assigned

College Physics

College Physics

Eugenia Etkina,… 1st Edition
Achievement 1,063 solutions

Viewed Questions

Two blocks of masses $m_{1}$ and $m_{2}$ hang at the ends of string that passes over the very light pulley with low friction bearings shown in Figure P3.74. Determine an expression in terms of the masses and any other needed quantities for the magnitude of the acceleration of each block and the force that the string exerts on each block. Apply the equation for two cases: (a) the blocks have the same mass, but one is positioned lower than the other and (b) the blocks have different masses, but the heavier block is positioned higher than the light one. What assumptions did you make?

Two blocks of masses $m_{1}$ and $m_{2}$ hang at the ends of string that passes over the very light pulley with low friction bearings shown in Figure P3.74. Determine an expression in terms of the masses and any other needed quantities for the magnitude of the acceleration of each block and the force that the string exerts on each block. Apply the equation for two cases: (a) the blocks have the same mass, but one is positioned lower than the other and (b) the blocks have different masses, but the heavier block is positioned higher than the light one. What assumptions did you make?

College Physics

In the circuit shown in $\textbf{Fig. E26.28}$, find (a) the current in each branch and (b) the potential difference $V{_a}{_b}$ of point $a$ relative to point $b$.

In the circuit shown in $\textbf{Fig. E26.28}$, find (a) the current in each branch and (b) the potential difference $V{_a}{_b}$ of point $a$ relative to point $b$.

University Physics with Modern Physics

Direct-Current Circuits

Kirchhoff's Rules
If an ohmmeter is connected between points $a$ and $b$ in each of the circuits shown in Fig. $19.65,$ what will it read?

If an ohmmeter is connected between points $a$ and $b$ in each of the circuits shown in Fig. $19.65,$ what will it read?

College Physics

A capacitor that is initially uncharged is connected in series with a resistor and an emf source with $\mathcal{E}=110 \mathrm{~V}$ and negligible internal resistance. Just after the circuit is completed, the current through the resistor is $6.5 \times 10^{-5} \mathrm{~A}$. The time constant for the circuit is $6.2 \mathrm{~s}$. What are the resistance of the resistor and the capacitance of the capacitor?

Sears and Zemansky’s University Physics with Modern Physics

Questions asked

ANSWERED

Breanna Ollech verified

Numerade educator

Observe the circuit and calculate: a) the current supplied by the source b) the difference between the voltage and current at the source c) the power factor d) the impedance (type and value) to be placed in parallel with the source between points A and B in order to make the power factor unitary

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ANSWERED

Supratim Pal verified

Numerade educator

Consider a coil consisting of a compact winding of copper wire with 75 turns, a diameter of 3.50 cm and a length of 30 cm. Suppose a second winding with 150 turns was made around a cylindrical magnet (km = 950) with a diameter of 10 mm. The assembly is placed inside the first coil and the two ends of the wire are connected to a multimeter. Under these conditions, determine the value read by the multimeter if the current in the first coil decreases from 2 A to 200 mA in 500 ms.

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ANSWERED

Breanna Ollech verified

Numerade educator

The potential difference provided by battery B in the figure is equal to 24V. (a) Calculate the charge on each capacitor when switch S1 is closed. Suppose C1 = 3 nF, C2 = 2 nF, C3 = 4 nF, and C4 = 5 nF. (b) Assume that C2 is a parallel plate capacitor with an area measuring 20 cm x 20 cm and containing porcelain (dielectric constant equal to 6.5 and dielectric strength equal to 4 kV/mm) between the reinforcements. In these conditions determine the distance between plates and say if there is a danger of dielectric breakdown. (c) Determine the value of the charge induced in the dielectric

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ANSWERED

Vishal Gupta verified

Numerade educator

The figure on the side represents two conductors with a diameter 4 mm and separated by 60 mm (distance between the surfaces of conductors) which respectively carry currents of 44 A and 56 A. (a) Determine the magnetic field at points A and C knowing that these are located 3 mm from the longest conductors close together and at point B equidistant from the two conductors. (b) Determine, if exists a point where the magnetic field cancels out.

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ANSWERED

Supratim Pal verified

Numerade educator

In the circuit indicated in the figure, determine: (a) the potential difference Vab from point a in relation to point b; (b) determine the currents in each branch of the circuit if we connect the two points with a wire

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ANSWERED

Supratim Pal verified

Numerade educator

A circular winding with a diameter of 12.0 cm and 10 turns is placed in a region where there is a field magnetic force of 3.0 mT and which is perpendicular to the plane of the turns. (a) If we pass a current of 5.0 A through the winding determine the moment of torque that it will undergo. (b) Assume that it was possible to place the winding (R=4.0 Ohms and I=0 A) in rotation making two turns every second, under these conditions determine the current induced in the same

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INSTANT ANSWER

2. Two spherical, concentric, hollow conductors have radii 2 and 6 cm . The inner and outer spheres have a charge of \( 7 \times 10-9 \mathrm{C} \) and \( 11 \times 10-9 \mathrm{C} \), respectively. Consider also the existence of a point charge of -2.0 nC in the centre of the conductors. Determine (a) The potentials at distances of \( 1 \mathrm{~cm}, 4 \mathrm{~cm} \) and 8 cm from the centre; (b) The potential of the sphere exterior when connecting the interior to earth.

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ANSWERED

Supratim Pal verified

Numerade educator

1. (a) Derive an expression for the work required for an external agent to put together four charges (q = 9.5 ??C) as shown in the figure. The side of the square has length a =2.0 cm. (b) Determine the work required for an external agent to bring a charge Q =17 ??C from infinity to the middle of the top edge of the square.

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ANSWERED

Sam Stansfield verified

Numerade educator

Use Thévenin's theorem to determine the power dissipated in the resistance of 2 Ohms.

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ANSWERED

Brandy Heflin verified

Numerade educator

A coil of 150 turns, radius 1.5 cm and resistance 6.2 Ohms is placed on the inside a solenoid with 140 turns/cm. If the current in the solenoid is increased from 0 to 3.0 A, at a constant rate for 0.24 s that current will appear in the coil while the solenoid current is changing?

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