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3 years ago

Why does time seem to flow only in one direction?

Physics

2 answers:

Art [367]3 years ago

5 0

Answer:

Time seem to flow in only one direction because it's from entropy. In tiny physics, time is directionally neutral.

Explanation:

Mrac [35]3 years ago

5 0

Answer:

objects that store memories heat up as the operate(computers and brains). heat(energy) generation increases entropy. entropy is a measure of disorder. entropy is an irreversible process, so the laws of thermodynamics(law 1. energy can't be created or destroyed law 2. the total entropy must increase) require that such objects can only run in one direction: from past to present

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What happens when an electron moving from the 3rd energy level to the 1st energy level?

Sholpan [36]

Answer:

A photon of wavelength 103 nm is released

Explanation:

When an electron in an atom jumps from a higher energy level to a lower energy level, it releases a photon whose energy is equal to the difference in energy between the two levels.

For example, if we are talking about a hydrogen atom, the energy of the levels are:

$E_1 = -13.6 eV\\E_2 = -3.4 eV\\E_3 = -1.5 eV$

So, the energy of the photon released when the electron jumps from the level n=3 to n=1 is

$\Delta E = E_3 - E_1 = -1.5 -(-13.6)=12.1 eV$

In Joules,

$\Delta E =12.1\cdot 1.6\cdot 10^{-19} = 1.94\cdot 10^{-18} J$

We can also find the wavelength of this photon, using the equation:

$\Delta E = \frac{hc}{\lambda}\rightarrow \lambda=\frac{hc}{\Delta E}=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{1.94\cdot 10^{-18}}=1.03\cdot 10^{-7} m = 103 nm$

7 0

4 years ago

A uniform plank of length 6.1 m and mass 33 kg rests horizontally on a scaffold, with 1.6 m of the plank hanging over one end of

salantis [7]

Answer:

Explanation:

consider the principle of moment

when a system is in equilibrium, the clockwise moment (torque) about the pivot is equal to the counterclockwise moment ( torque). Since the plank is uniform the weight of the plank act at the middle which = 6.1 m / 2 = 3.05 m

the distance that can support the weight of the man = d

mass of the man = 70

70 × d = 33 × ( 3.05 - 1.6)

d = 47.85 / 60 = 0.798 m, if the man work beyond this point he will fall.

8 0

3 years ago

The SI units of mass density are kg/m3, but there are several other common units. One of the most commonly used units of mass de

gulaghasi [49]

Answer:

Explanation:

Given

mass of object $m=59\ gm$

Volume displaced $V_d=827.5\ ml$

According to Archimedes' principle buoyant force equals to weight of volume displace by an object.

Therefore Buoyant force $F_b=\rho \times V_d\times g$

where $\rho =Density\ of\ water(1000\ kg/m^3)$

g=acceleration due to gravity

substituting values

$F_b=1000\times 0.8275\times 10^{-3}\times 9.8$

$F_b=8.109\ N$

3 0

4 years ago

Think about the movements of players in a baseball game. Some walk up to bat. Others sprint to steal a base. An outfielder jogs

Anna11 [10]

Answer:

different

Explanation:

3 0

3 years ago

Which sections of the heating curve illustrate this process?

kirill115 [55]

Answer:

B followed by D

Explanation:

The heat energy absorbed at B goes into potential energy that breaks the inter-molecular bonds and thus the constant temperature. Once the molecules have gained enough energy they escape the closely bonded structure and thus are free to move in random directions due to high kinetic energy. At this point (part D) an increase in heat energy leads to an increase in the kinetic energy leading to an increase in the temperature.

5 0

3 years ago