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Consider the decay process E+ -> p + pi0. (a)(5 pts) What is the Q value of this reaction in MeV?(b)(5 pts) What is the energy of each particle (in MeV) if the E+ decays at rest? Use conserva-tion of energy and momentum.

A stick is resting on a concrete step with 1/7 of its length hanging over the edge. A single ladybug lands on the end of the stick hanging over the edge, and the stick begins to tip. A moment later, a second, identical ladybug lands on the other end of the stick, which results in the stick coming momentarily to rest 36.1° from the horizontal. If the mass of each bug is 2.75 times the mass of the stick and the stick is 18.7 cm long, what is the magnitude of the angular acceleration of the stick at the instant shown?(answer in rad/s^2)

The doctor is trying to decide what type of “feather” material to give his creations so that they keep warm while sleeping in the winter. Given the following data calculate the conductive heat flux (W) for the different “feather” materials. Material “A” has a K of 0.036 W/mK and increases the bird’s x by 2.769 x 10^-3 m. Material “B” has a K of 0.17 W/mK and increases the bird’s x by 1.308 x 10^-2 m. The bird’s internal temperature is 311.0 K (we are assuming that they are endothermic) and the temperature of the ground is 260.0 K. The distance from the exterior of the bird’s skin to its core is 0.75 m. When the animal is sleeping the surface area of the bird that touches the ground is 1.76 m². Which of these materials results in the smallest loss of heat due to conduction?     

Please include detailed work for answers

A piston contains 770 moles of an ideal monatomic gas that initally has a pressure of 1.23 × 10⁵ Pa and a volume of 4.2 m³. The piston is connected to a hot and cold reservoir and the gas goes through the following quasi-static cycle accepting energy from the hot reservoir and exhausting energy into the cold reservoir.

1. The pressure of the gas is increased to 4.23 × 10⁵ Pa while maintaining a constant volume.
2. The volume of the gas is increased to 11.2 m³ while maintaining a constant pressure.
3. The pressure of the gas is decreased to 1.23 × 10⁵ Pa while maintaining a constant volume.
4. The volume of the gas is decreased to 4.2 m³ while maintaining a constant pressure.

It may help you to recall that CVCV = 12.47 J/K/mole and CPCP = 20.79 J/K/mole for a monatomic ideal gas, and that the number of gas molecules is equal to Avagadros number (6.022 × 10²³) times the number of moles of the gas.

1)How much energy is transferred into the gas from the hot reservoir? ___J

2)How much energy is transferred out of the gas into the cold reservoir? ___J

3)How much work is done by the gas? ___J

How do you perform the mechanical advantage equation and howto find the f required to move a lever based on the resistance load, resistance arm, and the force arm

While a roofer is working on a roof that slants at 45.0 ∘∘ above the horizontal, he accidentally nudges his 90.0 NN toolboxes, causing it to start sliding downward, starting from rest.

a)If it starts 4.70 mm from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 19.0 NN ?

calculate the conductive heat flux (W) for the different “feather” materials. Material “A” has a K of 0.036 W/mK and increases the bird’s x by 2.769 x 10^-3 m. Material “B” has a K of 0.17 W/mK and increases the bird’s x by 1.308 x 10^-2 m. The bird’s internal temperature is 311.0 K (we are assuming that they are endothermic) and the temperature of the ground is 260.0 K. The distance from the exterior of the bird’s skin to its core is 0.75 m. When the animal is sleeping the surface area of the bird that touches the ground is 1.76 m². Which of these materials results in the smallest loss of heat due to conduction?     

Inflation

(a) What is the cosmic epoch of inflation in the early universe? How is this different from the usual expansion of the universe?

(b) What similarities and differences are there between inflation and dark energy?

Inflation

(a) Why is it puzzling that the observed CMB temperature is almost exactly the same on opposite sides of the sky? How would this result be explained in cosmology theories that do not include inflation?

(b) How does inflation answer the puzzle from part (a)? What other properties of the homogeneous universe does inflation explain?

Please use any of the methods to prove whether each of the following arguments is valid or invalid. For each problem, please identify the method that you have decided to employ and make sure to show your work.

1. It is obvious that nuclear energy is needed. Nuclear energy is needed if and only if solar energy cannot be harnessed. And it is also true both that solar energy can be harnessed only if funds to do so are available, and that funds are not available.

Please include detailed work for answers.

A window air conditioner uses 1272 W of electricity and has a coefficient of performance of 3.64. For simplicity, let's assume that all of that electrical energy is transformed into work done by the air conditioner to cool a room with dimensions of 7 m x 7 m x 3 m. The air inside this room will initially have the same temperature as the air outside (318 K) and the air conditioner will attempt to cool the room to 295 K. For the purposes of estimation, assume that the air in this room will be cooled at constant volume, that the specific heat of the air at constant volume is 720 J/kg-K, and that the density of the air is 1.2 kg/m³.

1)How much energy must be transferred out of this room in order to decrease the temperature of the air from 318 K to 295 K? ___J

2)How much work will be done by the air conditioner during the process of cooling the room? ___J

3)How much time in minutes will it take for the room to cool using this air conditioner? ___minutes

4)How much time in minutes would the cooling process take if instead we used an air conditioner that uses a Carnot cycle that operates between 318 K and 295 K? ___minutes