Estimate the initial rotation period of the Earth if the Moon had been torn from it, as suggested by the fission theory. Compare your answer to the estimated rate of spin of the early Earth (5 hours or so). Is the fission theory a viable theory?

A rectangular coil with N turns and area A is place in a uniform magnetic field directed into y-direction. (a) What amount of emf is induced in the coil if the coil doesn’t move or rotate? . Let’s say the coil rotates about the z-axis through its center at a constant angular velocity LaTeX: \omegaω. (b) What would be total magnetic flux through the coil as a function of LaTeX: \thetaθ ? (LaTeX: \thetaθ is the angle between the directions of area A and field-B) (c) Now, what amount of emf will be induced when the coil is rotating? (d) Is the magnitude of this emf time independent? If not show quantitatively and explain how it change with time. (e) Will it have a "rms Voltage" associated with it? If so what would be its "rms Voltage"?

Question #5 A. [1 point] Is Ampere’s valid for all closed paths surrounding current carrying conductor? If not, why? B. [4 points] Two identical semicircular arcs have radii ?1 = 7.8 ?? and ?2 = 5.8 ?? carry current ? = 0.281 ? and share the same center of curvature, C. (a) What are the magnitude and direction of net magnetic field at C? (b) If the direction of the current is reversed, what effect does it have on the magnetic field?

Question #4 A. [1 point] Explain briefly the factors affecting the magnitude of the induced emf in an electricity generating station. B. [4 Points] A rectangular coil of 10 turns with dimensions 10 ?? × 8 ?? sides is held perpendicular to the uniform magnetic field, with half the area of the loop in the field, as shown the following figure. The loop contains an ideal battery with emf E = 1.5 ?. The magnitude of the magnetic field varies with time according to ? = − 4?2 + 3? + 3.0 , with B in teslas and t in seconds. (a) Calculatethemagnitudeanddirectionoftheemfinducedaroundtheloopat?=15???. (b) Find the net current with appropriate direction in the loop at ? = 15 ??? if the loop has a resistance of 2 ohm

Diamagnetic susceptibility of atoms: (a) Estimate the upper limit for the (dia) magnetic moment of an atom. Use an atom with many electrons such as Bi. From the magnetic moment, calculate the diamagnetic susceptibility and compare it to the experimental value, which is _m = 1.7x10-4 .

To better understand the polarization consider two components of the electric field:
Ex(t) = 3 Cos (w t) and Ey(t) = 4 Cos (w t-phi). Then determine the functional form of
Ey(Ex) (that is find Ey as a function of Ex at any time t) for the following phase
angles  = 0, 45, 90, -90, 180 degrees. State these functional forms (polarizations)
and sketch them in (Ex, Ey) plane being as specific as you can with maxima and
minima on the graphs.

A box is sliding on a rough surface at a constant speed. Which statement is TRUE?

1. Work done by gravity is negative

2. Friction deos not do any work

3. Work done by friction is negative

4 Work done by friction can be either positive or negative depending on direction of motion?

Another planet has the same spherical radius as Earth, but has 3 times Earth's density.

(a) What is the mass of this other planet?

(b) what is its gravitational acceleration

Description: An airplane is flying from San Francisco to Seattle which is a distance of approximately 1200 km. The cruising speed of the plane (VP ) is 400 km/hr relative to the air, and on a calm day (no wind) the pilot would fly on a path, due north, arriving in Seattle exactly 3.0 hours after leaving San Francisco(ignoring the time spent taxiing, taking off, landing etc.). However, today, the wind is blowing due east with a constant velocity (VW) of 50 km/hr relative to the ground, and the pilot has not taken this into account. Without paying attention, the pilot keeps the plane pointed due north for the entire flight.

1.) (3 points) Relative to the ground, in which direction is the plane flying (use theta for angles: θ)? Derive an algebraic solution and then give a numerical answer (three significant figures is fine) expressed in degrees relative to due north (e.g. ’45.0° west of north’).

2.) (2 pts) After flying for 3.0 hours, how far is the plane from Seattle? Again, derive an algebraic solution, then give the numerical result (3 significant figures). A smarter pilot is flying the next scheduled flight and takes note of the first pilot’s failure to deal with the winds. He takes the wind speed and direction into account so that the path of this plane relative to the ground is due north. This pilot’s plane is identical to the first in every way including the speed, and the wind has not changed in velocity or direction.

3.) (2 pts) How long, in hours, does it take the second pilot to reach Seattle? Again, give the algebraic solution first and then a numerical answer to three significant figures.

4.) (3 pts) Assume the two planes left at the same exact moment. Write an algebraic expression for the distance between two planes as a function of time (∆P(t) = … ). You may only use the variables VP , VW , θ and t as needed.

Hi I just wanted to double check to see if my answers were correct and how you approached the problem. Thanks!

Explain different ways you can arrange 4 resistors in order to get different equivalent resistance values. Mention about minimum and maximum values you can obtain.

Multiple choice: Which one of the following statements about our Sun is true?

(a) The Sun consists primarily of hydrogen and helium.

(b) The Sun is a very active star, blasting waves of energy, solar flares, and winds continuously and uniformly with time.

(c) The apparent motion of sunspots on the Sun is caused mainly by Earth’s orbit.

(d) Being an uncharged (i.e., neutral) star, the Sun does not have a significant magnetic field.

(e) Sunspots were first discovered recently, using telescopes in space.

Multiple choice: Which one of the following statements about our Sun is true?

(a) Being farther from the center of the Sun, the chromosphere has a lower temperature than the photosphere.

(b) Sunspots appear dark because there isn’t any nuclear fusion occurring in them, unlike the case in the surrounding photosphere.

(c) The chromosphere appears reddish pink because it reflects Hα emission from the photosphere.

(d) Coronal mass ejections occur when the nuclear-fusion rate in the Sun suddenly increases by a large amount.

(e) The Sun’s rotation period can be determined by tracking the positions of long-lived sunspots.

Multiple choice: Which one of the following does not change during the course of one full 22-year solar activity cycle?

(a) The frequency of sunspots.

(b) The Sun’s overall magnetic field orientation.

(c) The Sun’s rotation speed.

(d) The frequency of coronal mass ejections.

(e) The frequency of prominences and flares.

Calculate the surface redshift due to gravity for both the white dwarf and neutron star.

What is the difference between a restorative and disruptive force? Provide a real-life scenario that represents these two different forces.

Please Type Out Answer

Research existing multi-vehicle, PV-assisted vehicle charging facilities. Create a report for one that has characteristics that interest you. At the minimum, the report and its narrative should include:

An image of the system
A summary of technical specs
Info on who and what this facility designed is to serve
Especially note: Is it grid connected, is there energy storage? If so, what kind?
What interested you in this particular design?
The URL, article reference, etc. for your information source(s)

You have the option of producing a written report in full sentence, paragraph form (with bulleted lists where appropriate), or a slide presentation with voiceover in VoiceThread, Your report upload is due 11 PM Tuesday 1/16. Written report uploads should be a PDF or Word file. VoiceThreads should be limited to 6 slides. Writing style and engineering document design counts, so take the same care with this report as you would any other important assignment.

See the Using VoiceThread link on the left for instructions for creating a multimedia report from a PowerPoint or PDF document. Upload your report using the VoiceThread Reports link. Set your sharing to include the class.

A grading rubric is included.

A spacecraft is coasting toward Mars. The mass of Mars is 6.4 × 10²³ kg and its radius is 3400 km (3.4 × 10⁶ m). When the spacecraft is 8900 km (8.9 × 10⁶ m) from the center of Mars, the spacecraft's speed is 2250 m/s. Later, when the spacecraft is 5200 km (5.2 × 10⁶ m) from the center of Mars, what is its speed? Assume that the effects of Mars's two tiny moons, the other planets, and the Sun are negligible. Precision is required to land on Mars, so make an accurate calculation, not a rough, approximate calculation.