Consider a long, thin, plastic cylindrical shell centered at the origin. It has a radius 2R and a linear charge density -3 λ .

b. Use Gauss's Law to find the electric field (mag and direction) at a distance x=3R from the origin.

Now a long line of charge (parallel to the axis of the cylinder) is added at a distance x=4R with linear charge density + λ .

c. use superposition to find the force (mag. and direction) on an electron placed at x=3R

A rectangular loop has 17 turns with sides w=.03m and l=.06m. The current is 9A. What is the force on each side and the torque on the loop if the external field is 0.5 T and is directed: (a) parallel to the plane of the loop (B1) (along the positive x-axis)? (b) normal to the plane of the loop (B2) (into the paper)?

Use the exact values you enter to make later calculations. Part A A group of students performed the same "Ohm's Law" experiment that you did in class. They obtained the following results: Trial ΔV (volts) I (mA) 1 1.00 4.4 2 1.90 8.4 3 3.10 13.3 4 3.90 16.8 5 5.10 22.2 where ΔV is the voltage difference across the resistor and I is the current traveling through the resistor at the same time. (a) Analyze the data. (You will not submit this spreadsheet. However, the results will be needed later in this problem.) (i) Enter the above data into an Excel spreadsheet. (ii) Make a plot of the voltage difference vs. current. Hint (iii) Use the trendline option in Excel to fit the data of voltage difference versus current to get the slope and intercept. Hint (b) Determine the slope and y-intercept of your graph, and report these values below. (Use ohm for Ω.) slope = y-intercept = Part B Your mischievous lab partner takes the resistor that you just experimented with and assembles it in a network with one other resistor and places them inside a black box. He challenges you to tell him the configuration of the resistors inside the box. Being an industrious physics student you connect the leads of the black box to your power source, voltmeter (in parallel), and ammeter (in series) and take the following simultaneous measurements. ΔV (volts) I (mA) 4.28 11.5 Use the above measurements to find the equivalent resistance of the arrangement. (Use ohm for Ω.) Req = Based on your value of the equivalent resistance, what must the arrangement be? in series in parallel Part C Now that you've answered his challenge, your lab partner asks you to give the resistance of the resistor that he added to the one you experimented with. Using the information you obtained in parts A and B, predict this value of the resistance of the second resistor.

two particles having charges q1=0.500nC and q2 8.00nC are separated by a distance of 1.20m. at what point along the line connecting the two charges is the total electric field due to the two charges equal zero?

THIS IS ASTR 100

1. The latitude of Seattle is 47 degrees north. How many degrees above the north point of the horizon is the north celestial pole as seen from Seattle?

2. Circumpolar stars circle around the north celestial pole [clockwise, counterclockwise]

3. The Earth rotates from [west to east, east to west].

4. If you travel south, Polaris would get [higher, lower] in the sky.

5. Where on Earth could you see all the constellations rise and set?

6. Astronomers measure distances across the sky in [inches, meters, angles]

7. According to the Universe Bowl (See page 6), on the time scale civilization began about [1 yard, 1 foot, less than 1 inch] from the other goal line.

pick an earthquake either recent or in the past and write a brief news article that would go in a paper explaining where, when, can you explain tectonic setting that caused the earthquake, what kinds of damage was done, was it a deep or shallow "focus" earthquake any other information that you can find that would be exciting to put in. (100 words)

Occupational safety experts have developed an alternative criterion for electrical safety. They have found that shocks lasting less than 3 s will be nonlethal if the product of the voltage drop across the body, the current through the body, and the time (≤ 3.0 s) that the current flows does not exceed 13.5 V⋅A⋅s = 13.5 J. Suppose that one hand of a potential victim is grounded and the other hand touches a voltage source; suppose further that his skin resistance is negligible--a worst-case scenario.

Using the criterion above, what is the largest voltage that will not be lethal for a shock that lasts 1.2 s?

Your book has a section entitled "Energy Choices" and "Energy Problems" with a discussion that never includes the term "planetary overpopulation." Do you think the energy problems of the world can be solved if our human population continues to increase? Why or why not? Make a good argument! Support your idea with facts.

A curve of radius 40 m is banked for a design speed of 60 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve?
minimum

maximum

Please type down (easy for me to copy and paste) your response (thoughts, ie agree or diagree and why?) after your reading the following paragraphs. (min 5 sentences, 150-200 words)

Climate change is a great environmental threat that requires attention. It exacerbates extreme weather patterns and changes in temperature, which in turn affect the livelihoods and lifestyles of people around the world. The biggest cause of climate change is the emission of CO2. One solution to climate change is the use of current renewable energy. Renewable energy is an adequate form of energy that does not require fuel. Its advantage is that it is virtually inexhaustible in duration; they are constantly replenished. However, they are limited in flow; solar energy and wind power are not always available. Another solution is nuclear power, which is a less appealing solution compared to renewable energy. Advancing technology nuclear power can increase the risk that the nuclear power will be used for malevolent purposes, such as creating weapons. Nuclear power is also dangerous in that errors in operation can lead to a disaster similar to that of Chernobyl, where a nuclear reactor explosion caused numerous deaths resulting from radiation exposure.

Bill Gates’ proposed solution for the climate change problem is TerraPower. TerraPower “breeds [the 99%, the 238] uranium as it goes along, so it's kind of like a candle” (Gates, 2010). The 238 uranium is thus essentially a “miracle battery,” storing enough fuel for the entire lifetime on the planet (Gates, 2010). I think if we depend on nuclear power for energy, there is always the risk of equipment malfunction and radiation exposure, which is extremely detrimental. Nonetheless, Gates understands the value of discovering innovative ideas through research and technology in order to benefit the public. Essentially, his wish for efficient, low cost energy is an idea worth spreading.

Please type down (easy for me to copy and paste) your response (thoughts, ie agree or diagree and why?) after your reading the following paragraphs. (min 5 sentences, 150-200 words)

Energy and climate is not only extremely important to the poorest, but yes I do agree that it is more important and affect them more than anyone else. It is best to acknowledge that there are people who did not know the scale or density of how much carbon is released into the atmosphere and how negatively it has impacted it. Now that fossil fuels and coals are what's essential to our everyday lives, that basically keeps our power on, it is extremely hard for us to aim to undo what has been done or even switch over to nuclear power plant just like that.

Nevertheless, if we as a people do not see climate change as a problem, our motivation in doing something about it or our aim to help improve our atmosphere is basically nonexistence. As Bill Gates said: "We need a new system, we need energy miracles". Gates have brought up 5 solutions, Solar Thermal, Solar Photovoltaic, Nuclear, Wind and Carbon Capture and Storage. I am more familiar with the solar and wind energy as being more efficient, though it will be definitely costly. Moreover, I would rather invest in solar energy because even though it may be expensive, in will still save a lot in the long run. Yes, Bill Gate is right that the sun doesn't shine all the time and the wind doesn't always blow. That is why we aim to create batteries that we store these energies for a long period of time. This is the type of investment that I rather my tax money goes into and also our focus as a society should be more towards.

Calcium reacts with sulfur (S8) forming calcium sulfide. What is the theoretical yield (g) of CaS(s) that could be prepared from 1.83 g of Ca(s) and 3.35 g of sulfur(s)? Enter your answer in decimal format with two decimal places and no units.

A four-wheel cart of mass M = 95 kg is moving along a horizontal surface with a constant velocity V = 3.5 m/s relative to the ground. A person of mass m1 = 65 kg carrying a backpack of m2 = 8 kg runs and catches up to the cart, and then jumps onto the cart. Just before landing on the cart, the person is moving parallel to the ground and the velocity of the center of mass of the system including the person, backpack and cart is VCM = 5 m/s.

What is the speed of the person just before landing on the cart?

v₀ = 5.3 m/s

v₀ = 12 m/s

v₀ = 0.45 m/s

v₀ = 7 m/s

v₀ = 8.8 m/s

2)

What is the horizontal momentum of the person after landing on the cart?

p_f = 325 kg m/s

p_f = 455 kg m/s

p_f = 228 kg m/s

3)

Compare the total kinetic energy of the system including the person, backpack and cart before the person has landed on the cart to after.

KE_before = KE_after

KE_before > KE_after

KE_before < KE_after

4)

The person now holds the backpack off the back of the cart and lets go. The backpack falls to the ground. What happens to the speed of the cart when the backpack is dropped?

increases

decreases

stays the same

(Note: Answers are D, A, B, C. Please show work and reasoning.)

(a) How long (in s) would it take a 1.00 ✕ 10⁵ kg airplane with engines that produce of 100 MW of power to reach a speed of 200 m/s and an altitude of 12.0 km if air resistance were negligible?

_? s

(b) If it actually takes 950 s, what is the power applied, in megawatts?

_? MW

(c)Given this power, what is the average force (in kN) of air resistance if the airplane takes 1200 s? (Hint: You must find the distance the plane travels in 1200 s assuming constant acceleration.)

_? kN

What is the phase shift of the TM and TE rays reflected both externally (air to glass) and internally (glass to air) for the situation discussed in Prob. 10?
Prob. 10 is Calculate the reflectance and transmittance for both TE and TM modes of light incident from air at 30 onto glass of index 1.60.