assume the universe is a spherical cavity with a radius 10^26m and temperature 2.7K. how many...

assume the universe is a spherical cavity with a radius 10^26m and temperature 2.7K. how many thermally excited background radiation photons are there in the universe?

Expert Solution

genius_generous answered 2 years ago

A non-conducting sphere of radius R centered at O contains a spherical cavity of radius R’...

A non-conducting sphere of radius R centered at O contains a spherical cavity of radius R’ centered at O'. Let d be the displacement of O’relative to 0. Throughout the sphere, there is a uniform charge density rho_0 (except inside the cavity, which is uncharged). (a) Use the principle of superposition to write down an expression for E(r) everywhere. (b) Repeat (a) for the electric potential b(r).

The surface of a spherical conductor of radius a is kept at a temperature of u(φ)=300K+50K...

The surface of a spherical conductor of radius a is kept at a temperature of u(φ)=300K+50K cos(φ). The temperature inside is governed by the Laplace equation. Find an expression for the temperature everywhere inside the sphere. Evaluate the temperature at the center of the sphere.

10. Assume there is a certain type of celestial object in the universe that is born,...

10. Assume there is a certain type of celestial object in the universe that is born, matures, ages, and eventually dies. All of these objects were born at essentially the same time in the life of the universe and we can tell something about their age from their photographs. With our telescope we photograph two of them: Object A, 20 million light-years away and Object B, 200 million light years away. The light from which object took the longest time...

A spherical object with a radius rrr = 4.2×10−7 mm and mass m is in...

A spherical object with a radius rrr = 4.2×10−7 mm and mass m is in equilibrium at a distance ddd = 9.1×1012 mm from a star due to the cancellation of gravitational and radiation forces. Let MsMsM = 2.1×1032 kgkg be the mass of the star, and PsPsP = 5.9×1028 WW be the total average power radiated by it uniformly in all directions. You will also need the gravitational constant GGG = 6.7×10−11 Nm2/kg2Nm2/kg2 and the speed of light...

a. Consider a (spherical) pebble of radius 1 cm falling under the influence of gravity. Assume...

a. Consider a (spherical) pebble of radius 1 cm falling under the influence of gravity. Assume it experiences a quadratic drag force (i.e., proportional to the velocity squared). Assume the constant of proportionality for the drag force is the product of a constant κQ and a geometric factor is the square of the radius. Assume the density of stone is 2500 kg/m3 and that κQ = 0.87 kg/m3 . Estimate the terminal velocity of the pebble (vT ). b. Consider...

A spherical object with a radius r = 3.2×10−6 m and mass m is in equilibrium...

A spherical object with a radius r = 3.2×10−6 m and mass m is in equilibrium at a distance d = 6.0×1012 m from a star due to the cancellation of gravitational and radiation forces. Let Ms = 4.7×1032 kg be the mass of the star, and Ps = 9.9×1029 W be the total average power radiated by it uniformly in all directions. You will also need the gravitational constant G = 6.7×10−11 Nm2/kg2 and the speed of light c...

Part A Calculate the vapor pressure for a mist of spherical water droplets of radius 2.30×10−8...

Part A Calculate the vapor pressure for a mist of spherical water droplets of radius 2.30×10−8 m at 298 K. The vapor pressure of water at this temperature is 25.2 Torr. Part B Calculate the vapor pressure for a mist of spherical water droplets of radius 2.45×10−6 m at 298 K. The vapor pressure of water at this temperature is 25.2 Torr.

How many inhabitable planets are there in the universe? Two estimates are given by Drake's Equation...

How many inhabitable planets are there in the universe? Two estimates are given by Drake's Equation and Seager's Equation. Do a little research on Drake's Equation and Seagar's Equation. Summarize what you've found. From a probability standpoint, particularly subjective probability, how do these equation hold up? Comment and justify your comments particularly in the light of subjective probability.

Assume that the water temperature is 10°C and the depth of the settling tank is 3.0...

Assume that the water temperature is 10°C and the depth of the settling tank is 3.0 m. Calcium carbonate precipitates with a relative density of 1.20 and diameter of 0.10 mm to be removed in a settling tank after softening treatment. Assume discrete particle settling. At 10°C the density and viscosity of water are 999.77 kg/m3 and 1.308x10-3 kg/m.s. a. Calculate the theoretical settling velocity (cm/s), tank loading (m3 /m2 /d) and detention time (h) required for the removal. b....

Stars can be described using many different parameters: mass, color, temperature, luminosity, radius, single or binary....

Stars can be described using many different parameters: mass, color, temperature, luminosity, radius, single or binary. What are the qualities of the closest stars? What are the qualities of the brightest stars? Do you think we have a skewed perspective due to what we observe in the night sky? Why/why not?

Question