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3 years ago

5

Why is Pluto now called a dwarf planet?

2 answers:

Jobisdone [24]3 years ago

4 0

Answer:

<em>In 2003, astronomers discovered a new object beyond Pluto that they named Eris. That discovery caused astronomers to talk about the defining characteristics of a planet. They decided that because of its size and location, Pluto, along with Eris, were not planets. Pluto, Eris, and objects like them are now classified as dwarf planets.</em>

Explanation:

Alex Ar [27]3 years ago

3 0

Answer:

In 2003, astronomers discovered Eris.

The discovery of Eris caused astronomers to talk about the defining characteristics of a planet.

Because Pluto has not cleared its orbit, it is not considered to be a planet.

Pluto, Eris, and other objects like them are now classified as dwarf planets.

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Explanation:

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3 years ago

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A 0.1 kg block of brass is cooled until it releases 56.4 J of heat. If the temperature of the block was 5 K initially, what is i

Zolol [24]

Answer:

3.5 K

Explanation:

When a sample of a substance releases heat energy, its temperature decreases according to the equation:

$Q=mC(T_f-T_i)$

where

Q is the heat energy released

m is the mass of the substance

C is the specific heat capacity

$T_i$ is the initial temperature

$T_f$ is the final temperature

For the block of brass in this problem, we have:

m = 0.1 kg is the mass

Q = -56.4 J is the heat energy released (negative since it is released)

C = 380 J/kg K is the specific heat capacity of brass

$T_i=5 K$ is the initial temperature

Solving for $T_f$ , we find the final temperature:

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3 years ago