Questions
A long, straight wire carrying a current I1 is placed on a horizontal table in front...

A long, straight wire carrying a current I1 is placed on a horizontal table in front of you and the direction of the current points +x axis. The magnetic field produced by the current I1 at a point 5 cm above the wire is 0.2 T. A second parallel wire carrying a current I2 = 3I1 is placed 10 cm above the first wire and the direction of the current also points +x axis. What is the magnitude of the net magnetic field produced by these two currents at a point 5 cm above the table?

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Assume a liter of milk has an activity of 1960 pCi due to 4019K, with RBE...

Assume a liter of milk has an activity of 1960 pCi due to 4019K, with RBE = 1. If a person drinks 2 glasses (0.440 L) per day, estimate the total dose received in a year. As a crude model, assume the milk stays in the stomach 13.4 h and is then released. Assume also that 15.0 percent of the 1.50 MeV released per decay is absorbed by the body, and that this person is a 64.6 kg adult.


? The maximum annual dose to be used for this calculation is given below. ?


b)
What percentage of the allowed dose does this correspond to if the allowed yearly dose is 5 mSv?

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A parallel-plate capacitor with circular plates of radius a separated by a distance d is being...

A parallel-plate capacitor with circular plates of radius a separated by a distance d is being charged though a resistor R and battery with emf E.

1 (a) (5pts.) Make a diagram showing the direction of the induced magnetic field between the plates.

(b) (15pts) Show that the magnitude of this induced magnetic field r < a is given by B(r) = µ0 r 2π a2 E R e −t/RC, where r is the distance to the axis of symmetry of the plates.

(c) (4pts.) Why is the magnetic field independent on the distance to either of the plates?

(d) (6pts.) What is the maximum magnetic field between the plates if they have a radius of a = 1.0 cm, and the capacitor is being charged by a 120.0 V battery through a 5.0 Ω resistor?

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What phase difference between two otherwise identical traveling waves, moving in the same direction along a...

What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having an amplitude 1.3 times that of the common amplitude of the two combining waves? Express your answer in (a) degrees, (b) radians, and (c) as a fraction of the wavelength.

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A set of jumper cables used to start a car from another car's battery is connected...

A set of jumper cables used to start a car from another car's battery is connected to the terminals of both batteries.  

If 20 A of current exists in the cables during the starting procedure and the cables are parallel and 20 cm apart, do the wires repel or attract?

If 20  of current exists in the cables during the starting procedure and the cables are parallel and 20  apart, do the wires repel or attract?

attract
repel

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Correct

Part B

Explain.

Essay answers are limited to about 500 words (3800 characters maximum, including spaces).

3800 Character(s) remaining

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Part C

What is the magnetic field strength that each wire produces at the location of the other?

Express your answer using two significant figures.

B

B

=

nothing

  T  

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Part D

What is the force per unit length on the cables?

Express your answer using two significant figures.

F/L

F / L

=

nothing

  N/m  

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A helicopter propeller blade starts from rest and experiences a constant angular acceleration of 14.0 rad/s2....

A helicopter propeller blade starts from rest and experiences a constant angular acceleration of 14.0 rad/s2. Find the speed of a point on the blade 5.60 m from the axis of rotation when the blade has completed 13 revolutions.

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A uniform ladder 5.30  m long rests against a frictionless, vertical wall with its lower end 3.10  m...

A uniform ladder 5.30  m long rests against a frictionless, vertical wall with its lower end 3.10  m from the wall. The ladder weighs 157  N . The coefficient of static friction between the foot of the ladder and the ground is 0.430. A painter weighing 739  N climbs slowly up the ladder.

How far along the ladder can the painter climb before the ladder starts to slip?

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If it should happen that a high voltage electric line should drop from the pole and...

If it should happen that a high voltage electric line should drop from the pole and make contact with a car, the person in the car should jump out of the car with both feet at the same time, rather than stepping out, one foot at a time. Explain the rationale behind this safety tip.

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The hollow cylinder from the last problem is attached to a spring with spring constant k...

The hollow cylinder from the last problem is attached to a spring with spring constant k = -1.6 and extended to an initial displacement of 9 cm

A) What is the period if it takes 20 s to travel to a point halfway between the 1st equilibrium point and the negative extreme displacement?

B) What is the displacement 7 s later?

C) What is the velocity at this point?

D) What is the acceleration?

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We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 65.0 kg...

We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 65.0 kg and diameter 1.00 m.

Part A If this tumbler rolls forward at 0.300 rev/s , how much total kinetic energy does he have?

Part B What percent of his total kinetic energy is rotational?

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7.3 Steam Generator Tube Break (c) What particular precautions would need to be followed while shutting...

7.3 Steam Generator Tube Break

(c) What particular precautions would need to be followed while shutting down such a unit?

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Steam at 100°C is added to ice at 0°C. (a) Find the amount of ice melted...

Steam at 100°C is added to ice at 0°C.

(a) Find the amount of ice melted and the final temperature when the mass of steam is 11 g and the mass of ice is 49 g.

(b) Repeat with steam of mass 2.0 g and ice of mass 49 g.

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(a) A 374 kg satellite orbits the Earth at a height of 3197 km above the...

(a) A 374 kg satellite orbits the Earth at a height of 3197 km above the Earth's surface. Assume the Earth has a mass of 5.98 x 1024 kg and a radius of 6,380 km. Find the velocity (in m/s) of the satellite in its orbit.

(b) Calculate the period of the satellite's orbit when it orbits the Earth at a height of 3197 km above the Earth's surface. State your answer in minutes.

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The angular momentum of a flywheel having a rotational inertia of 0.407 kg·m2 about its central...

The angular momentum of a flywheel having a rotational inertia of 0.407 kg·m2 about its central axis decreases from 5.40 to 0.970 kg·m2/s in 4.60 s. (a) What is the magnitude of the average torque acting on the flywheel about its central axis during this period? (b) Assuming a constant angular acceleration, through what angle does the flywheel turn? (c) How much work is done on the wheel? (d) What is the magnitude of the average power done on the flywheel?

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A damped oscillator is formed by attaching a mass with m = 1.5 kg to one...

A damped oscillator is formed by attaching a mass with m = 1.5 kg to one end of a spring with spring constant k = 8 N/m. The other end of the spring is anchored and the mass can slide on a horizontal surface The damping force is given by –bv with b = 230 g/s. At t=0, the mass is displaced so that the spring is compressed by 12 cm from its unstretched length and released from rest.

(a) Find the time required for the amplitude of the resulting oscillations to decay to 1/3 of its initial value.

(b) How many oscillations are made by the mass during this time?

(c) Find the value of b so that the oscillator is critically damped.

(d) At t=0, this critically damped oscillator is displaced so that the spring is stretched a distance of 12 cm beyond its unstretched length, find the time required for mass to reach the position for which the spring is stretched by only 4 cm.

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