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notsponge [240]

3 years ago

7

Which is the transfer of thermal energy in matter with no overall transfer of matter? If you copy the answer from the last quest

ion your wrong and you will be reported.
conduction
radiation
insulation
convection

2 answers:

kogti [31]3 years ago

8 0

I believe radiation is the correct answer

zzz [600]3 years ago

6 0

the answer is radiation

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A child pulls a toy wagon with a force of 25.0 N for a distance of 8.5M. How much work did the child do on the wagon?

zzz [600]

Answer:

hi

f=25.0 w=d 25.0÷8.5

s=8.5m

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2 years ago

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A rope is vibrated so that transverse waves propagate down it. if the distance between crests is 0.5 m and a new crest reaches t

xxMikexx [17]

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3 years ago

What is the frequency of a sound wave commonly called?

WARRIOR [948]

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3 0

3 years ago

g An astronaut must journey to a distant planet, which is 189 light-years from Earth. What speed will be necessary if the astron

Butoxors [25]

Answer:

The value is $v = 2.999 *10^{8} \ m/s$

Explanation:

From the question we are told that

The time taken to travel to the planet from earth is $t = 189 \ light-years$

The time to be spent on the ship is $t_{s} = 12 \ years$

Generally speed can be obtained using the mathematical relation represented below

$t_s = 2 * t * \sqrt{1 - \frac{v^2}{c^2 } }$

The 2 in the equation show that the trip is a round trip i.e going and coming back

=> $12 = 2 * 189 * \sqrt{1 - \frac{v^2}{(3.0*10^{8})^2 } }$

=> $v = 2.999 *10^{8} \ m/s$

5 0

2 years ago