You want to produce three 1.00-mm-diameter cylindrical wires, each with a resistance of 5.00 Ω at room temperature. One wire is gold, one is copper, and one is aluminum. Refer to Table 25.1 in the textbook for the resistivity values.

Part A

What will be the length of the gold wire?

Part B

What will be the length of the copper wire?

Part C

What will be the length of the aluminum wire?

Part D

Gold has a density of 1.93 × 104 kg/m3. What will be the mass of the gold wire?

Part E

If gold is currently worth $40 per gram, what is the cost of the gold wire?

1.- Electrical properties of biological tissues.

2.- Permittivity and its physical meaning

3.- Conductivity and its physical meaning

4.- Dispersion factors and their interpretation

5.- Relationship of the electrical properties of biological tissues and cancer in tissues.

Please develop good explination of each stament

A 540-g squirrel with a surface area of 875 cm² falls from a 5.2-m tree to the ground. Estimate its terminal velocity. (Use the drag coefficient for a horizontal skydiver. Assume that the squirrel can be approximated as a rectanglar prism with cross-sectional area of width 11.2 cm and length 22.4 cm. Note, the squirrel may not reach terminal velocity by the time it hits the ground. Give the squirrel's terminal velocity, not it's velocity as it hits the ground.)


What will be the velocity of a 54.0-kg person hitting the ground, assuming no drag contribution in such a short distance?

One end of a cord is fixed and a small 0.320-kg object is attached to the other end, where it swings in a section of a vertical circle of radius 1.50 m, as shown in the figure below. When ? = 17.0

A steel bicycle wheel (without the rubber tire) is rotating freely with an angular speed of 14.5 rad/s. The temperature of the wheel changes from -142 to 244 °C. No net external torque acts on the wheel, and the mass of the spokes is negligible. What is the angular speed of the wheel at the higher temperature?

Typing The Answer Is Mandatory

Examine the structures of the bulbs to form a conclusion as to the reason that fluorescent bulbs last longer than incandescent bulbs.

Challenge #1: How is electrostatic force (Felect) related to the magnitude of charge on the two objects?

1. Keeping the separation distance for all trials the SAME, change the magnitude of the charges and record the force.

Challenge #2: How is the electrostatic force (Felect) related to the separation distance (d) the two charges?

1. Keeping the magnitude of charge on both objects the SAME, collect data relating distance to force.

a. Write an expression for the electric field vector of a uniform plane wave in free space that is propagating in the direction given by a line from the origin to the point (3,0,4) and that is linearly polarized along the y-direction. It has a wavelength of 2 �m and reaches its positive maximum amplitude of 20 V/m at a distance of 1 m from the origin at t = 0 s.

b. Compute the irradiance of this wave.

1. What is the potential at the center of a charged circular loop with a total charge of Q and radius R?
2. A point charge q is moved a distance d parallel to the x-axis in a region of space where there is an electric field of magnitude E which is parallel to the y-axis. What is the change in the potential energy of the charge?
3. A collection of point charges exists in a region of space. Is it possible to arrange the charges so that the potential at a point P is equal to zero?
4. If the potential is constant in a certain region of space, what can you say about the electric field there?

6. In each situation described below, compare the magnitudes of the two forces. Explain your answer in each case.

a. A 90-kg an and a 60-kg boy each have one hand extended out in front and are pushing on each other. Neither is moving. Compare the force exerted by the man’s hand on the boy’s hand to that exerted by the boy’s hand on the man’s.

b. In (a), the boy begins to slide along the floor. Now compare the same two forces between their hands.

c. A person is leaning against a wall with her hand straight out pushing against the wall. Compare the force exerted by her hand on the wall to that exerted by the wall on her hand. What is the type of force exerted by the wall on her hand called?

d. In (c), is the force exerted by the wall on the person’s hand passive or active explain?

e. In (c) compare the horizontal component of the force exerted by the person’s feet on the floor to the horizontal component of the force exerted by the floor on her feet. What is the type of force exerted by the floor on her feet called?

f. Is the force describe in (e) that the person exerts on the floor passive or active? Explain.

Two of the wavelengths emitted by a hydrogen atom are 121.6nm and 1876nm .

What is the m value for the wavelength 121.6nm ?

What is the n value for the wavelength 121.6nm ?

What is the m value for the wavelength 1876nm ?

What is the n value for the wavelength 1876nm ?

For the wavelength 121.6nm , is the light infrared, visible, or ultraviolet?

For the wavelength 1876nm , is the light infrared, visible, or ultraviolet?

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 72.9-kg man just before contact with the ground has a speed of 8.74 m/s. (a) In a stiff-legged landing he comes to a halt in 1.71 ms. Find the magnitude of the average net force that acts on him during this time. (b) When he bends his knees, he comes to a halt in 0.268 s. Find the magnitude of the average net force now. (c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, find the magnitude of the force applied by the ground on the man in part (b)

1. A student pulls horizontally on a 12 kg box, which then moves horizontally with an acceleration of 0.2 m/s². If the student uses a force of 15 N, what is the coefficient of kinetic friction of the floor?

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The output voltage of an AC generator is given by ?v = 121 V sin (32?t). The generator is connected across a 0.007 H inductor. Find the following.

(a) frequency of the generator?=____ Hz

(b) rms voltage across the inductor?=____ V

(c) inductive reactance?=____ ohms

(d) rms current in the inductor?=____ A

(e) maximum current in the inductor?=____ A

(f) average power delivered to the inductor?=____ W

(g) Find an expression for the instantaneous current. (Use the following as necessary: t.)

" i=_________ "

(h) At what time after t = 0 does the instantaneous current first reach 1.00 A? (Use the inverse sine function.)?=_____ s

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