2. a. What is the value of neutron flux considering Source-free, Non-multiplying Systems with Plane Geometry, if Φ (x) = 3.3 X 1013 x2 and Diffusion Length, L = 2.85 cm. If you get negative value, consider the absolute term for neglecting the negative sign. [15]

   b. What is the value of neutron current density? Assume Φ (x) = 3.3 X 1013 x and Diffusion Length, L = 2.85 cm and ∑a = 2.1 X 104 cm-1? [15]

C) One day on the lake we went between the dots. The following times were measured. 240 seconds, 20 minutes, 10.6 minutes and 45 minutes. I started at 10am, what time did I pass the last dot? And how long did it take?

Uppgift 2

A) How many dl of sugar do I get if I collect everything in a jar. The small bowl has ¾ dl sugar and between the bowl has 3/8 dl sugar?

B) Then mix 1.5 dl of liquid. 12% was water, 48% was milk and 40% was cream. How many dl did I take from each part?

Uppgift 3

A) What speed do I keep if I cut a distance of 20km in 15 minutes?

B) To calculate the effect in a liquid cooler, I used the following method Effect = flow / h * energy content of the liquid * temperature difference.

20 l / min, 4.18kJ / kg * K, 10K. How big is it?

C) To calculate the resistance, I used the following method:

1 / R = 1 / R1 + 1 / R2 + 1 / R3. R1 = 4, R2 = 3, R3 = 4 What is the resistance R?

D) What will be the current I if U = I * R and U = 12Volt

E) Calculate the power P = U * I

Design a two-axis pneumatic pick and place robot. The robot is to pick up a part with a mass of 2.0 kg. The length of the horizontal motion is 250mm. The length of the vertical motion is 240mm. The available air pressure is 650000 Pa. The mass of the gripper and slide is 2.5 kg. The mass of the horizontal axis is 4.0 kg. Assume g = 9.81m/s2.

P is pressure [Pa], F is force[N], A is area {m2], m is mass[kg], a is acceleration[m/s2],s is distance[m], u is initial velocity[m/s], t is time[s].

⦁   What is the minimum force required to hold up the horizontal axis, gripper and slide, and part?
F=_____N

⦁   What is the force required to operate the vertical motion upwards in 0.2 seconds?
F=______N

⦁   What is the minimum area of the cylinder required to produce these forces for the vertical motion?
A=_____mm2

⦁   What is the minimum diameter for the vertical cylinder required to produce these forces?
D=______mm

⦁   What cylinder diameter would you choose for the vertical axis? Standard 5mm increments
Bore =______mm

Halley's comet last passed perihelion on February 9, 1986. The famous comet's orbit has semimajor axis a = 17.8 AU and eccentricity e = 0.967. Solve Kepler's equation and calculate the quantities E (radians), v= 0 (degrees), and the length of the radius vector r (from the sun, in AU) for July 10, 2015.

For simplicity, take the time of day for all dates to be exactly noon, local time. How does your value of r compare with the actual current position of the comet (no need to compare the current values of E and teta)? What might be a reason for any difference?

I do appreciate it if anyone can help me with this!

A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 19.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration of 3.06 m/s2 for a distance of 70.0 m to the edge of the cliff, which is 40.0 m above the ocean.

a) Find the car's position relative to the base of the cliff when the car lands in the ocean.

(b) Find the length of time the car is in the air.

Imagine that you are a physician today. You slip through a wormhole and end up in a parallel dimension at a dinner table with Benjamin Rush, Egas Moniz, and, oddly enough, Doctor Oz. In at least 200 words use your perspective as a modern physician (and one who understands the historical context of these respective doctors) to tell them what you think they got right and got wrong about their approaches to health and medicine. In your response, be sure to discuss the role of evidence in your perspective.

The Hubble Space Telescope (HST) is an Earth-orbiting telescope whose primary mirror has a diameter of 2.4 metres.

a) What is the best possible angular resolution (in arc-seconds) that the HST can achieve when observing visible light (wavelengths between 400 nm and 700 nm)? Which colour of visible light can be best resolved?

b) Jupiter’s four largest moons (the Galilean Moons) are about the same size as Earth’s Moon and are as close as about 628 million kilometres (6.28 × 108 km) from Earth at opposition. Using your answer from part a), calculate the size, in kilometres, of the smallest details the HST can distinguish on their surfaces.

c) Can the HST be used to study a 300-km-diameter crater on the surface of Jupiter’s largest moon, Ganymede? Can the HST be used to study a 50-km-diameter crater on the surface of Ganymede? Justify your answers.

Hypothesize how ancient people were able to design and erect enormous artifacts without modern technology. How were these ancient people able to predict cycles?

As a society we get energy from:

• Fossil fuels • Hydroelectric plants • Nuclear power plants • Wind turbines • Solar cells

For each of these, trace what forms of energy are involved in getting energy from the source to your home.

(a) Show that the solar flux densities (irradiances) from the sun, F1 and F2, relate one another as the inverse square of their distances from it, that is: 2 2 1 2 1 F = (r /r ) F .

(b) Use the answer to (a) to solve the following question: The orbit of Mars around the sun is more eccentric than that of the earth. At its closest Mars is 200 million kilometers from the sun, and at its furthest it is 250 million kilometers from the sun. Given that the flux density of solar radiation reaching the earth is 1368 W/m2 and the earth-sun distance is 150 million kilometers, estimate the solar flux density impinging upon Mars at its two extreme distances from the sun. What do these numbers tell you about the likely variations in the mean temperature of the surface of Mars during its passage around the sun?

1.   All of the following are true of Alpha radiations except:

1. They are often termed He nuclei, or He⁺⁺
2. They have extremely low Linear Energy Transfer, on the order of 1/1800 of that of electrons
3. They are extremely heavy relative to other nuclear radiations such as Betas
4. They are historically significant serious internal dose hazards (e.g., respiratory exposures)

2.   The unit of exposure relating the ability of X-radiation to produce ionization in air:

1. rad
2. rem
3. Roentgen
4. LET

3.   If the maximum energy associated with Beta decay from P-32 is 1.71 MeV, then the industrial hygienist would expect:

1. This to be considered a "High Beta" source
2. No serious hazards from directly ionizing radiation
3. The average energy from P-32 decay to approximate 0.60 MeV
4. Both A and C

4.  Which of the following are true of Gamma and X-ray radiation:

1. They are essentially identical radiation if of the same energy
2. X-rays emanate from nucleus interactions, Gammas from electron cloud interactions
3. X-rays emanate from electron cloud interactions, Gammas from nucleus  interactions
4. Both A and C

5.  Grays are to rads, as Sieverts are to:

1. Roentgens
2. MeV/gram tissue
3. Quality factors
4. Rems

Data Table A

Data Table B

% Difference= 2×(Change in momentum-Impulse)(Change in momentum+Impulse)×100=

Questions

1. What are possible reasons why the change in momentum is different from the measured impulse?
2. How will raising the end of the Dynamics Track give the cart the same acceleration each time?
3. Compare the impulse and force for an abrupt (hard) and a cushioned (soft) collision. Use words and also sketch the force vs. time graphs.

Summary:

An ultrasound machine in a hospital uses a sound source at 19.00000MHz.

1. Assuming that the speed of the ultrasound in the body is same as water (1440 m/s), determine the wavelength in the body.
2. If blood cells are moving towards the sound source at a speed of 0.8 m/s, at what frequency do the crests of the sound wave pass through the blood cell?
3. What is the frequency of the sound waves reflected back towards the source by the blood cells?
4. 1. If the sound level intensity is 17.0 dB at a point d₁ = 6.8 cm from the source, what is the sound intensity at that point in W/m². (We can assume that 0 dB is referenced to 10^-12 W/m²).
   2. Assume that sound is emitted from a point source, so that the intensity decreases quadratically with distance. What is the intensity level in dB at a point d₂ = 2.0cm from the source?

1. The Electric field will always be zero inside a conductor that is in electrostatic equilibrium.   What if the electric field wasn’t zero?

2.  Sometimes an electric ground is called a charge reservoir. Explain why this is appropriate.

3. An electric dipole is a common arrangement of charge in matter; water is one example. Where does the electric field created by an electric dipole become zero? Explain.

4. Sketch the approximate electric field pattern below due to two isolated negative point charges. Be sure to include directions on your electric field lines.