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.

If you have ever hiked or climbed to high altitudes in the mountains, you surely have noticed how short of breath you get. This occurs because the air is thinner, so each breath contains fewer O2 molecules than at sea level. At the top of Mt. Everest, the pressure is only 13atm. Air contains 21.0 % O2 and 78.0 % N2, and an average human breath is 0.480 L of air.

Part A) At the top of Mt. Everest, how many O2 molecules does each breath contain when the temperature is -10.0 ∘F?

Express your answer as number of molecules.

Part B) What percent is this of the number of O2 molecules you would get from a breath at sea level at -10.0 ∘F?

Express your answer as a percentage.

A new printed circuit board design for a high speed electronic oscillator seems to fail at high frequencies. Your job is to double check the design. One part of the circuit consists of two rectangular loops, the smaller one centered inside the larger one. Both rectangles have their long sides in the same direction. The smaller rectangle has long sides of length ℓ and short sides of length w. It is centered inside the larger rectangle whose long sides are very very long and whose short sides have length h. You calculate the mutual inductance of the two loops in terms of the given quantities and known constants to see if this could cause the circuit to act abnormally. Because the long sides of the larger rectangle are very long, you decide to neglect the effect of its short sides on the inner rectangle.

A home run is hit in such a way that the baseball just clears a wall 14.0 m high, located 122 m from home plate. The ball is hit at an angle of 37.0° to the horizontal, and air resistance is negligible. (Assume that the ball is hit at a height of 1.0 m above the ground.)

Find the velocity components of the ball when it reaches the wall.

x - component

y- component

1. Identify two situations where CONVEX mirrors are used and explain why.

2. Why is the curved bathroom mirror considered a magnifying mirror. Explain the optics.

3. Why are telescopes made with parabolic mirrors instead of spherical mirrors?

4. Why is a multi-trillion dollar industry dependent on a small critical angle of plastic?( Hint fiber optics).

A psychrometer has a dry-bulb reading of 85°F and a wet-bulb reading of 79°F. Find each of the following measurements.
(a) relative humidity
%

(b) dew point
°F

(c) maximum moisture capacity of the air
gr/ft3

(d) actual moisture content of the air
gr/ft3

A 2.00 mol sample of an ideal gas with a molar specific heat of C_V = (5/2)R always starts at pressure 2.00 ✕ 10⁵ Pa and temperature 300 K. For each of the following processes, determine the final pressure (P_f, in kPa), the final volume (V_f, in L), the final temperature (T_f, in K), the change in internal energy of the gas (ΔE_int, in J), the energy added to the gas by heat (Q, in J), and the work done on the gas (W, in J). (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.)

A.) The gas is heated at constant pressure to 420 K.

P_{f =}
Vf =

Tf=

ΔEint=

Q =

W =

B)The gas is heated at constant volume to 420 K.

P_{f =}
Vf =

Tf=

ΔEint=

Q =

W =

C)The gas is compressed at constant temperature to 250 kPa.

P_{f =}
Vf =

Tf=

ΔEint=

Q =

W =

D)The gas is compressed adiabatically to 250 kPa

P_{f =}
Vf =

Tf=

ΔEint=

Q =

W =

To get a better idea about tidal forces, Esperanza and Mika assume that the black hole is about one solar mass, 2.0 ✕ 10³⁰ kg, and that the distance from its center to the person's feet is 3 km (the approximate Schwarzschild radius, the distance at which the escape speed from the body becomes c, the speed of light). They also assume that the person's mass is 60 kg and the person's height is 2 m. How can they use the equation for the tidal force,  

F_tidal = GMm (1/d^2 - 1/ (d+h)^2) to find how many times greater this tidal force is than the weight of the person on Earth, approximately 600 N? (Choose the ratio of the tidal force to the weight of the person on Earth.)

The closest known star to our solar system is Alpha Centauri, which is approximately 4.30 light years away. Spaceship A, with a constant speed of 0.800c relative to the Earth and a proper length of 100 m, travels from Earth to this star. Spaceship B with a constant speed of 0.600c relative to the Earth travels from Earth to this star.
(a) How much time would elapse during Spaceship A’s trip on a clock on Earth?

(b) How much time would elapse during Spaceship A’s trip on a clock on Spaceship B?

(c) How long is Spaceship A for an observer at rest on Spaceship B

A potter's wheel (a thick stone disk with radius 0.45 m and mass 85 kg) is freely rotating at 52 rev/min. The potter can stop the wheel in 6.3 seconds by pressing a wet rag against the rim and exerting a radially inward force of 85 N. What is the coefficient of kinetic friction between the rag and the wheel?

The Correct answer is 0.19 please explain and show in why?