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leonid [27]
3 years ago
11

Question 1 of 10

Physics
2 answers:
valentina_108 [34]3 years ago
6 0

Answer:416 kJ

Explanation:

a p e x

blsea [12.9K]3 years ago
5 0

lmoooooi9okkkkjghedjydthaksidhqelzyakx

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A weightlifter lifts a 250-kg mass 0.5 meters above his head, how much PEg does the mass have (Note: g=9.8 m/s2)? Round your ans
Anna71 [15]
The Gravitationa potential energy of the mass (PEG) is given by:
U=mgh
where
m is the mass
g is the gravitational acceleration
h is the heigth of the mass above the reference level (the ground)

In this problem, m=250 kg and h=0.5 m, therefore the gravitational potential energy of the mass is:
U=mgh=(250 kg)(9.8 m/s^2)(0.5 m)=1225 J
6 0
3 years ago
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Metals are good conductors of electricity because __________ . A) they are easily reduced and oxidised. B) they are easily ionis
Advocard [28]

Answer:

a

Explanation:

because they are easily reduced and oxidised

3 0
3 years ago
Do atoms ever touch​
Mumz [18]

Answer:

nope never

Explanation:

8 0
3 years ago
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HELP QUICK WILL GIVE BRAINLEST!!!!
Romashka-Z-Leto [24]
Hello!

The statement that <span>describes the solar feature shooting off into space labeled C is An envelope of plasma surrounding the Sun. 

This is called the Solar Corona. It is the outmost layer of the Sun's atmosphere. The Corona is hotter than the visible surface of the Sun. (1 000 000 - 3 000 000 K). It is composed of Plasma (The fourth state of the matter, similar to the gaseous state, but with electrically charged particles). All structural details of the Solar Corona are derived from the Magnetic Field of the Sun. 

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3 years ago
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Glass absorbs ultraviolet (UV) rays from the Sun. Would a fraction of the incident UV light be reflected from the air/glass boun
fiasKO [112]

Answer:

Yes

Explanation:

Any transparent surface in practical is neither a perfect absorber of electromagnetic waves neither a perfect reflector. Generally all the transparent surfaces reflect some amount of irradiation and the other parts are absorbed and transmitted.

<u>That is given by as relation:</u>

\alpha+\rho+\tau=1

where:

\alpha= absorptivity which is defined as the ratio of the absorbed radiation to the total irradiation

\rho= reflectivity is defined as the ratio of reflected radiation to the total irradiation

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3 years ago
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