Planck's universe, cube or sphere?

Planck's universe, cube or sphere?
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The problem with spheres is they don’t pack tightly together; they leave odd spaces in between which presumably cannot be smaller than the Planck length.
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A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling? (1) Circular plate (2) Cube (3) Sphere (4) All will cool at the same rate

Description : A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling? (1) Circular plate (2) Cube (3) Sphere (4) All will cool at the same rate

Last Answer : (3) Sphere Explanation: In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.

A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling? (1) Circular plate (2) Cube (3) Sphere (4) All will cool at the same rate

Description : A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling? (1) Circular plate (2) Cube (3) Sphere (4) All will cool at the same rate

Last Answer : Sphere

If a sphere is inscribed in a cube, then find the ratio of the volume of the cube to the volume of the sphere. -Maths 9th

Description : If a sphere is inscribed in a cube, then find the ratio of the volume of the cube to the volume of the sphere. -Maths 9th

Last Answer : The ratio of the volume of the cube to the volume of the sphere are as

If a sphere is inscribed in a cube, then find the ratio of the volume of the cube to the volume of the sphere. -Maths 9th

Description : If a sphere is inscribed in a cube, then find the ratio of the volume of the cube to the volume of the sphere. -Maths 9th

Last Answer : The ratio of the volume of the cube to the volume of the sphere are as

A cube and a sphere are of the same height. -Maths 9th

Description : A cube and a sphere are of the same height. -Maths 9th

Last Answer : Volume of cube/ volume of the sphere = a3 / 4/3.π.(a/2)3 = 6/π (Let edge of cube be a then radius of sphere = a/2) ∴ Required ratio = 6 : π

A cube of side 5 cm contain a sphere -Maths 9th

Description : A cube of side 5 cm contain a sphere -Maths 9th

Last Answer : Each side of the cube (a) = 5 cm Diameter of the sphere (2r) = 5 cm . ∴ Radius of the sphere (r) = 5/2 cm Volume of the cube = a3 = 53 cm3 = 125 cm3 Volume of the sphere = 4/3 πr3 = 4/3 x ... /2 x 5/2 = 65.476 cm3 Volume of gap between cube and sphere = 125.000 cm3 - 65.476 cm3 = 59.524 cm3

A sphere and a cube have the same surface area. What is the ratio of the square of volume of the sphere to the square of volume of the cube ? -Maths 9th

Description : A sphere and a cube have the same surface area. What is the ratio of the square of volume of the sphere to the square of volume of the cube ? -Maths 9th

Last Answer : answer:

There are two identical cubes. Out of one cube, a sphere of maximum volume (VS) is cut off. Out of the second cube, a cone of maximum volume -Maths 9th

Description : There are two identical cubes. Out of one cube, a sphere of maximum volume (VS) is cut off. Out of the second cube, a cone of maximum volume -Maths 9th

Last Answer : answer:

The volume of a sphere (V) varies directly as the cube of its radius. The volume of the sphere of radius 3 cm is ` 36 pi cm^(3)`. What is the volume o

Description : The volume of a sphere (V) varies directly as the cube of its radius. The volume of the sphere of radius 3 cm is ` 36 pi cm^(3)`. What is the volume o

Last Answer : The volume of a sphere (V) varies directly as the cube of its radius. The volume of the sphere of ... What is the volume of a sphere of radius 15 cm?

The volume of a sphere (V) varies directly as the cube of its radius. The volume of the sphere of radius 3 cm is ` 36 pi cm^(3)`. What is the volume o

Description : The volume of a sphere (V) varies directly as the cube of its radius. The volume of the sphere of radius 3 cm is ` 36 pi cm^(3)`. What is the volume o

Last Answer : The volume of a sphere (V) varies directly as the cube of its radius. The volume of the sphere of ... What is the volume of a sphere of radius 15 cm?

Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity? (A) Sphere(B) Cube(C) Cylinder (L/D = 1)(D) Raschig rings

Description : Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity? (A) Sphere (B) Cube (C) Cylinder (L/D = 1) (D) Raschig rings

Last Answer : (A) Sphere

A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0for the cubic to spherical tablet is: (A) 0.54 (B) 1.04 (C) 1.24 (D) 1.94

Description : A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t ... tablet is: (A) 0.54 (B) 1.04 (C) 1.24 (D) 1.94

Last Answer : (C) 1.24

A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest? (A) Cube (B) Plate (C) Sphere (D) All will cool at the same rate

Description : A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest? (A) Cube (B) Plate (C) Sphere (D) All will cool at the same rate

Last Answer : (D) All will cool at the same rate

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for (A) Cube (B) Cylinder (C) Sphere (D) Equal for all the three

Description : Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil ... (A) Cube (B) Cylinder (C) Sphere (D) Equal for all the three

Last Answer : (A) Cube

The Gaussian surface for a point charge will be a) Cube b) Cylinder c) Sphere d) Cuboid

Description : The Gaussian surface for a point charge will be a) Cube b) Cylinder c) Sphere d) Cuboid

Last Answer : c) Sphere

The Gaussian surface for a line charge will be a) Sphere b) Cylinder c) Cube d) Cuboid

Description : The Gaussian surface for a line charge will be a) Sphere b) Cylinder c) Cube d) Cuboid

Last Answer : b) Cylinder

The most efficient way to enclose a space is within a/an A.sphere B.cube C.icosahedron D.helix

Description : The most efficient way to enclose a space is within a/an A.sphere B.cube C.icosahedron D.helix

Last Answer : C.icosahedron

The most efficient way to enclose a space is within a/an A.sphere B.cube C.icosahedron D.helix

Description : The most efficient way to enclose a space is within a/an A.sphere B.cube C.icosahedron D.helix

Last Answer : C.icosahedron

Out of the following pairs, which one does not have identical dimension? (1) Moment of inertia and moment of a force (2) Work and Torque (3) Angular momentum and Planck's constant (4) Impulse and Momentum

Description : Out of the following pairs, which one does not have identical dimension? (1) Moment of inertia and moment of a force (2) Work and Torque (3) Angular momentum and Planck's constant (4) Impulse and Momentum

Last Answer : (1) Moment of inertia and moment of a force

The unit of Planck's constant is – (1) Js (2) Js⁻² (3) J/s (4) Js²

Description : The unit of Planck's constant is – (1) Js (2) Js⁻² (3) J/s (4) Js²

Last Answer : (1) Js Explanation: The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.

Planck's constant was first introduced in order to obtain a correct theoretical prediction of: w) the distribution of frequencies occurring in black body radiation. x) the energy produced by the transformation of mass into energy. y) the speed of light. z) lifetime of the neutron.

Description : Planck's constant was first introduced in order to obtain a correct theoretical prediction of: w) the distribution of frequencies occurring in black body radiation. x) the energy produced by the transformation of mass into energy. y) the speed of light. z) lifetime of the neutron.

Last Answer : ANSWER: W -- THE DISTRIBUTION OF FREQUENCIES OCCURRING IN BLACK BODY RADIATION

What is the DeBroglie wavelength of a 1,200 kilogram corvette traveling at a rate of 25 meters per second? Planck's constant is equal to 6.62 x 10-34 Joule-seconds. w) 5.3 x 10-32 meters x) 5.9 x 10-34 meters y) 2.1 x 10-38 meters z) 1.6 x 10-40 meters

Description : What is the DeBroglie wavelength of a 1,200 kilogram corvette traveling at a rate of 25 meters per second? Planck's constant is equal to 6.62 x 10-34 Joule-seconds. w) 5.3 x 10-32 meters x) 5.9 x 10-34 meters y) 2.1 x 10-38 meters z) 1.6 x 10-40 meters

Last Answer : ANSWER: Y -- 2.1 x 10-38 METERS

You're about to board a space station, you turn & look down at the Earth, a perfect sphere floating majestically in the vastness of the universe, what is the first thought that comes into your mind?

Description : You're about to board a space station, you turn & look down at the Earth, a perfect sphere floating majestically in the vastness of the universe, what is the first thought that comes into your mind?

Last Answer : Oh, jeez, I hope I don’t die. (I usually have this thought before any risky behavior, and then I proceed.)

What is Planck's equation?

Description : What is Planck's equation?

Last Answer : The relation between the energy (E) of a photon and the frequency (v) of its associated electromagnetic wave is called the Planck relation or the Planck--Einstein equation:E = hvh is the Planck constant which as a value of about 6.626 * 10-34 J*s (a very very small number)

What is Planck's constant?

Description : What is Planck's constant?

Last Answer : Planck's constant describes the ratio between the energy of an electromagnetic wave and the frequency of that wave.

What is the physical significance of Planck's constant?

Description : What is the physical significance of Planck's constant?

Last Answer : Planck's Constant signifies the Photon Charge, and the Aether of "free space'. Photon energy is E=hf =hc/r = Q2zc/r and Q is the photon charge in Coulombs.. Planck's Constant is also related to the free space impedance ... 4)2= 1/2(.12)2= 1/2 (.0144)=7.2E-3. I believe that the electron is an effect

Bohr's theory of fixed orbits contradicts (a) Coulomb's law (b) Planck's theory (c) de Broglie relation (d) Uncertainty principle

Description : Bohr's theory of fixed orbits contradicts (a) Coulomb's law (b) Planck's theory (c) de Broglie relation (d) Uncertainty principle

Last Answer : Ans:(d)

The statement that "maximum wavelength of radiation is inversely proportional to the temperature" is __________ law. (A) Stefan-Boltzmann’s (B) Planck's (C) Wien's displacement (D) None of these

Description : The statement that "maximum wavelength of radiation is inversely proportional to the temperature" is __________ law. (A) Stefan-Boltzmann’s (B) Planck's (C) Wien's displacement (D) None of these

Last Answer : (C) Wien's displacement

Planck's distribution law is valid for __________ bodies. (A) Black (B) White (C) Coloured (D) All (A), (B) & (C)

Description : Planck's distribution law is valid for __________ bodies. (A) Black (B) White (C) Coloured (D) All (A), (B) & (C)

Last Answer : (C) Coloured

Which one gives the monochromatic emissive power for black body radiation? (A) Planck's law (B) Kirchhoff’s law (C) Wien's law (D) Stefan-Boltzmann law

Description : Which one gives the monochromatic emissive power for black body radiation? (A) Planck's law (B) Kirchhoff’s law (C) Wien's law (D) Stefan-Boltzmann law

Last Answer : (A) Planck's law

Stefan's block body radiation law can also be derived from __________ law. (A) Kirchoff’s (B) Planck's (C) Fourier's (D) None of these

Description : Stefan's block body radiation law can also be derived from __________ law. (A) Kirchoff’s (B) Planck's (C) Fourier's (D) None of these

Last Answer : (B) Planck's

The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law. (A) Kirchoff’s (B) Planck's (C) Wien's displacement (D) Stefan-Boltzmann

Description : The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law. (A) Kirchoff’s (B) Planck's (C) Wien's displacement (D) Stefan-Boltzmann

Last Answer : (A) Kirchoff’s

The unity of Planck's constant 'h' in the equation, E = hv is (A) J/s (B) J.S (C) J/kmol (D) kmol/J

Description : The unity of Planck's constant 'h' in the equation, E = hv is (A) J/s (B) J.S (C) J/kmol (D) kmol/J

Last Answer : (B) J.S

At Equilibrium, the radiation emitted must equal the radiation absorbed.  a. Boyle’s Law  b. Planck’s Law  c. Kirchoff’s Law  d. Joule’s Law

Description : At Equilibrium, the radiation emitted must equal the radiation absorbed.  a. Boyle’s Law  b. Planck’s Law  c. Kirchoff’s Law  d. Joule’s Law

Last Answer : Kirchoff’s Law

Kelvin-Planck’s law deals with  A. conservation of work  B. conservation of heat  C. conversion of heat into work  D. conversion of work into heat

Description : Kelvin-Planck’s law deals with  A. conservation of work  B. conservation of heat  C. conversion of heat into work  D. conversion of work into heat

Last Answer : Answer: C

When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called  A. Zeroth law of thermodynamics  B. First law of thermodynamics  C. Second law of thermodynamics  D. Kelvin Planck’s law

Description : When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called  A. Zeroth law of thermodynamics  B. First law of thermodynamics  C. Second law of thermodynamics  D. Kelvin Planck’s law

Last Answer : A. Zeroth law of thermodynamics

Kelvin Planck’s law deals with  (a) conservation of heat  (b) conservation of work  (c) conversion of heat into work  (d) conversion fo work into heat  (e) conservation of mass.

Description : Kelvin Planck’s law deals with  (a) conservation of heat  (b) conservation of work  (c) conversion of heat into work  (d) conversion fo work into heat  (e) conservation of mass.

Last Answer : Answer : c

The energy of the photon is ∙ a. Directly proportional to its bandwidth ∙ b. Directly proportional to the Planck’s constant ∙ c. Directly proportional to Boltzmann’s constant ∙ d. Inversely proportional to the Planck’s constant

Description : The energy of the photon is ∙ a. Directly proportional to its bandwidth ∙ b. Directly proportional to the Planck’s constant ∙ c. Directly proportional to Boltzmann’s constant ∙ d. Inversely proportional to the Planck’s constant

Last Answer : Directly proportional to the Planck’s constant

The product of uncertainties of two physical observables must be approximately equal to a)Coulomb’s constant K b) Rydberg’s constant R c)Planck’s constant d)All of the above

Description : The product of uncertainties of two physical observables must be approximately equal to a)Coulomb’s constant K b) Rydberg’s constant R c)Planck’s constant d)All of the above

Last Answer : c)Planck’s constant

The SI unit of Planck’s constant is a) Joule – Sec-1 b) Joule – Sec-2 c) Joule – Sec d) Joule – Sec2

Description : The SI unit of Planck’s constant is a) Joule – Sec-1 b) Joule – Sec-2 c) Joule – Sec d) Joule – Sec2

Last Answer : c) Joule – Sec

he dipole magnetic moment (μ) is directly proportional to nuclear spin (I), connected by a constant called the A. Gyromagnetic ratio (γ) B. Planck's constant (h) C. Nuclear susceptibility (χ) D. Chemical shift (δ)

Description : he dipole magnetic moment (μ) is directly proportional to nuclear spin (I), connected by a constant called the A. Gyromagnetic ratio (γ) B. Planck's constant (h) C. Nuclear susceptibility (χ) D. Chemical shift (δ) 

Last Answer : Gyromagnetic ratio (γ)

Can a photon be smaller than a Planck sphere?

Description : Can a photon be smaller than a Planck sphere?

Last Answer : The planck length is 1.616 X 10-35 meters long. Now . a photon is a conundrum because it seems to have mass, but acts like a wave (pure energy). From what I understand of the facts, photons take up even ... enough. I'll see if BBE can weigh in on this with how he understands it as a PhD of physics.

If you are sealed into a sphere with a highly mirrored interior and you turn on a flashlight and then turn it off will the interior stay lit up?

Description : If you are sealed into a sphere with a highly mirrored interior and you turn on a flashlight and then turn it off will the interior stay lit up?

Last Answer : No. I think there is a certain amount of electron displacement that occurs with each reflection, which absorbs some of the light energy so that the reflection would eventually stop. However, if the ... I don't think is possible with current technology) then yes the interior would stay lit up.

How do you figure out the percent uncertainty in the volume of a sphere when you know its radius with a particular degree of certainty?

Description : How do you figure out the percent uncertainty in the volume of a sphere when you know its radius with a particular degree of certainty?

Last Answer : I have never had to do a problem like this, so apologies if I lead you astray. I would start here: what’s the relationship between the radius of a sphere and its volume?

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are l0 m above the ground, they have the same. -Physics

Description : An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are l0 m above the ground, they have the same. -Physics

Last Answer : (a) acceleration

A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct? (1) Both the spheres will reach the ground simultaneously. (2) A will reach the ground first. (3) B will reach the ground first. (4) The question is incomplete because the masses of the spheres are not given.

Description : A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct? (1) Both the ... reach the ground first. (4) The question is incomplete because the masses of the spheres are not given.

Last Answer : (1) Both the spheres will reach the ground simultaneously. Explanation: If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy ... objects will reach the ground at the same time if they are dropped simultaneously from the same height.

A drop of liquid assumes spherical shape because: (1) Intermolecular forces are strong in liquids (2) A sphere has the least surface area for a given volume (3) A sphere has the largest surface area for a given volume (4) Inter molecular forces are weak in liquids

Description : A drop of liquid assumes spherical shape because: (1) Intermolecular forces are strong in liquids (2) A sphere has the least surface area for a given volume (3) A sphere has the largest surface area for a given volume (4) Inter molecular forces are weak in liquids

Last Answer : (2) A sphere has the least surface area for a given volume Explanation: A drop of liquid assumes spherical shape because a sphere has the least surface area for a given volume.

A sphere rolls down on two inclined planes of different angles but same height, it does so – (1) in the same time (2) with the same speed (3) in the same time with the same speed (4) in the same time with the same kinetic energy

Description : A sphere rolls down on two inclined planes of different angles but same height, it does so – (1) in the same time (2) with the same speed (3) in the same time with the same speed (4) in the same time with the same kinetic energy

Last Answer : (2) with the same speed Explanation: The velocity of the sphere at the bottom depends only on height and acceleration due to gravity. Both these values are constants. Therefore, the velocity at the bottom ... . The kinetic energy will be the same. What will differ is time taken to reach the bottom.

Mass of steel sphere having density 7850 kg m-3 and radius 0.15 m is A. 112 kg B. 290 kg C. 110.9 kg D. 300 kg

Description : Mass of steel sphere having density 7850 kg m-3 and radius 0.15 m is A. 112 kg B. 290 kg C. 110.9 kg D. 300 kg

Last Answer : 110.9 kg