Two long, charged, thin-walled, concentric cylindrical shells have radii of 3.9 and 9.4 cm. The charge per unit length is 6.8 × 10^-6 C/m on the inner shell and -8.5 × 10^-6 C/m on the outer shell. What are the (a) magnitude E and (b) direction (radially inward or outward) of the electric field at radial distance r = 5.9 cm? What are (c) E and (d) the direction at r = 14 cm?

A record of travel along a straight path is as follows: 1. Start from rest with constant acceleration of 2.65 m/s2 for 16.0 s. 2. Maintain a constant velocity for the next 1.20 min. 3. Apply a constant negative acceleration of ?9.34 m/s2 for 4.54 s. (a) What was the total displacement for the trip? m (b) What were the average speeds for legs 1, 2, and 3 of the trip, as well as for the complete trip? leg 1 m/s leg 2 m/s leg 3 m/s complete trip m/s

A series RLC circuit consists of a 56.0 ? resistor, a 3.80 mH inductor, and a 400 nF capacitor. It is connected to a 3.0 kHz oscillator with a peak voltage of 4.10 V.

Part A

What is the instantaneous emf E when i =I?

Express your answer with the appropriate units.

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Part B

What is the instantaneous emf E when i =0A and is decreasing?

Express your answer with the appropriate units.

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Correct

Part C

What is the instantaneous emf E when i =?I?

Express your answer with the appropriate units.

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Step 1 – What are the major primary air pollutants and their sources?

Step 2 - What are the secondary pollutants, and how are they formed?

Step 3 – Distinguish between emissions and ambient concentrations. How are they measured?

3. Frequency and wavelength are both in your equation for speed. Why is it that, when you changed the frequency, you did not change the speed of the wave?

Federal funding agencies must form committees to decide which telescope projects will receive funds for construction. When deciding whic projects wil be funded, the committees must consider:

that certain wavelengths of light are blocked from reaching Earth's surface by the atmosphere,

how efficiently telescopes work at different wavlengths, and

that telescopes in space are much more expensive to construct than Earth-based telescopes.

Using these three criteria, consider each pairing of telescope proposals listed below. For each pair, state which of the two you would choose to fund and explain your reasoning.

Pair A)

Project Beta:  An X-ray wavelength telescope, located near the North Pole, which will be used to examine the Sun.

Project Alpha: An infrared wavelength telescope, placed on a satellite in orbit around Earth, which will be used to view supernovae.

Pair B)

Project Rho: A UV wavelength telescope, placed high atop Mauna Kea in Hawaii at 14,000 ft above sea level, which will be used to look at distant galaxies.

Project Sigma: A visible wavelength telescope, placed on a satellite orbit around Earth, which will be used to observe a pair of binary stars located in the constellation Ursa Major.

Pair C)

Project Zeta:  A radio wavelength telescope, placed on the floor of the Mojave Desert, which will be used to detect potential communications from distant civilizations outside our solar system.

Project Epsilon:  An infrared wavelength telescope, located in the high-elevation mountains of Chile, which will be used to view newly forming stars (protostars) in the Orion nebula.

Hockey puck B rests on a smooth ice surface and is struck by a second puck A, which has the same mass. Puck A is initially traveling at 16.0m/s and is deflected 22.0 degrees from its initial direction. Assume that the collision is perfectly elastic.

a) Find the final speed of puck b after the collision.

b) Find the final speed of puck a after the collision.

c) Find the direction of b's velocity after the collision

Discuss Einstein and Planck's collaborative work on the photoelectric effect and their differing views about whether science research is removed from social and political forces.

The rotor in a certain electric motor is a flat, rectangular coil with 89 turns of wire and dimensions 2.57 cm by 4.20 cm. The rotor rotates in a uniform magnetic field of 0.800 T. When the plane of the rotor is perpendicular to the direction of the magnetic field, the rotor carries a current of 10.6 mA. In this orientation, the magnetic moment of the rotor is directed opposite the magnetic field. The rotor then turns through one-half revolution. This process is repeated to cause the rotor to turn steadily at an angular speed of 3.72 103 rev/min.

(a) Find the maximum torque acting on the rotor.
0.000815N

A lens has a power of -1.72 D. You look through it a 1.00-cm long leaf held 33.34 cm from the lens. Calculate the image height, h_i, in cm, including the correct sign (+ for upright, - for inverted).

A WCU student, who is snowboarding at Cataloochee, slides horizontally off the ledge of snowbank that is 1.25 meters above the ground.   When she leaves the ledge, she is initially moving horizontally at 7.50 m/s. Ignore air friction, as usual.

1. Make a table showing values of x, y, v_x, v_y, and v_total from the beginning (t = 0) to end (you’ll have to figure out t_final) of her path for every 0.0200 seconds. (Note that she will hit the ground, y = 0, at the end.)

2. Plot a graph of the snowboarder’s position during this whole time. (That is, plot her y vs. x position on one single graph.)

1 point) A truck starts from rest and accelerates at 1?/?² . 6 s later, a car accelerates from rest at the same starting point with an acceleration of 2.7m/s² .

a) Where and when does the car catch the truck?

m from the starting point

at seconds from the moment the truck started to accelerate.

b) What are their velocities when they meet?

The truck : m/s

The car : m/s

explain in simple terms the postulates of the special theory of relativity