What is a time paradox?

Answers

Answer 1

Answer: Hey There Wolfie,

What is a time paradox?

A temporal paradox, time paradox, or time travel paradox is aparadox, an apparent contradiction, or a logical contradiction that is associated with the idea of time and time travel. Temporal paradoxesfall into two broad groups: consistency paradoxes exemplified by the grandfather paradox; and causal loops

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Carbon dioxide is added to the atmosphere: a) as a by-product of solar energy b) from the burning of fossil fuels c) from hydroelectric power plants and dams d) as a waste product from nuclear power plants
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To begin a dive, a diver jumps into the air and then lands on the diving board, causing it to bend. What type of energy conversions occur as the board springs back and propels the diver up into the air?

If a radio and a bulb each of resistance 3 ohm are connected in series to a 12 volts battery, the potential difference across each will be;a) 3V

b) 6V

c) 12V

d) 9V

Can u please solve and then explain answer

Answers

Answer:

$\rm{Option \:B) \: 6V}$

Explanation:

Given resistance of the radio is 3Ω and the resistance of the bulb is 3Ω. The total resistance in the circuit is

$R_1 + R_2 = 6 Ω</p><p>$

NowapplyOhm'sLaw,

$V \:=\: IR$

The voltage of the battery is V = 12V. And we have the total resistance of the circuit. Substituting the values to find current:

$I = 12 V / 6 Ω = 2A$

The potential difference across the radio or the bulb (using V = IR) is:

$V = 3 * 2 = 6V$

~The answer is option(b) 6 volts.

Calculate how much work is required to launch a spacecraft of mass m from the surface of the earth (mass mE, radius RE) and place it in a circular low earth orbit--that is, an orbit whose altitude above the earth's surface is much less than RE. (As an example, the International Space Station is in low earth orbit at an altitude of about 400 km, much less than RE

Answers

The work done to launch the spacecraft in low earth orbit is $(GM_emh)/(R_e(R_e+h))$

Work-energy theorem:

The gravitational force is a conservative force. So, the total energy of the system must be conserved.

According to the work-energy theorem:

work done = - change in potential energy of the system.

W = -ΔPE

Initially, the potential energy of the satellite on the surface is:

PE = $-(GM_em)/(R_e)$

where m is the mass of the satellite

Let the orbit be at a height of h from the surface, so the potential energy in the orbit is :

PE' = $-(GM_em)/(R_e+h)$

ΔPE = PE'-PE

ΔPE = $-GM_em((1)/(R_e+h)-(1)/(R_e))$

$\Delta PE=-(GM_emh)/(R_e(R_e+h))$

Now work done:

W = - ΔPE

Thus,

$W=(GM_emh)/(R_e(R_e+h))$

Learn more about work energy theorem:

brainly.com/question/13603991?referrer=searchResults

Answer:

Work done to shift the spacecraft from Earth surface to low Earth radius is given as

$W = (GM_e m)/(2R_e)$

Explanation:

As we know that spacecraft is at surface of Earth initially

So we will have

$U_i = -(GM_e m)/(R_e)$

now when it is at low radius Earth Orbit then we have

$U_f = -(GM_e m)/(2(R_e + h))$

now we know that work done to shift the spacecraft from Earth Surface to Low earth orbit is change in total energy

$W = -(GM_e m)/(2(R_e + h)) + (GM_e m)/(R_e)$

so we have

$W = (GM_e m)/(R_e) (-(1)/(2(1 + h/R_e)) + 1)$

$W = (GM_e m)/(R_e) (-(1)/(2)(1 - (h)/(R_e)) + 1)$

$W = (GM_e m)/(2R_e)(1 + (h)/(R_e))$

since we know h << Re

so work done is given as

$W = (GM_e m)/(2R_e)$

What fundamental force is responsible for the settling of Earth's layers?

Answers

Answer: gravity

Explanation: Despite being the weakest force, gravity works across infinite distances, making it responsible for the formation of the universe's structure.

The general consensus is that our policymakers do not know what they are doing and are managing our economy ineffectively

Answers

Answer:

True.

This is because, from the information provided so far, it could be concluded that, the policy makers don't have any single idea of what they are doing regarding to the economy.

This could be seen in the series of poor performance of the economic indicators as shown which has lead to poor economic growth in our country.

Explanation:

Which statement best describes the superposition principle?A. If two in-phase waves arrive simultaneously at a point, their amplitudes add up.
B. If two out-of-phase waves arrive simultaneously at a point, their amplitudes add up.
C. If two in-phase waves arrive at a point one after another, their amplitudes add up.
D. If two out-of-phase waves arrive at a point one after the other, their amplitudes adds up

Answers

C. If two in-phase waves arrive at a point one after another, their amplitudes add up.

Final answer:

The superposition principle states that when two in-phase waves arrive simultaneously at a point, their amplitudes add up.

Explanation:

The correct statement that describes the superposition principle is option A: If two in-phase waves arrive simultaneously at a point, their amplitudes add up. In-phase waves have the same frequency, wavelength, and direction. When two in-phase waves meet, the amplitude of the resultant wave is the sum of the individual amplitudes.

Learn more about superposition principle here:

brainly.com/question/30780170

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The __________ is the layer of the atmosphere where satellites and the space shuttle orbit the Earth.a. troposphere
c. mesosphere
b. stratosphere
d. exosphere

Answers

Answer: d. exosphere

The exosphere is the outermost layer of the atmosphere of earth. It is present above the thermosphere which is lying above the earth. From this layer, the atoms and molecules escape out, which maintains an environment for the movement of satellites and space shuttles.

The most likely answer, according to an informational article I have read, on the earths atmosphere, is exosphere. Hope it helps! If u need more info, message me!

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