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Arturiano [62]
3 years ago
10

Dora runs one lap around the track, finishing where she started. Clark runs a

Physics
1 answer:
Sonja [21]3 years ago
3 0

Answer:

See the answer below

Explanation:

Dora ran a complete lap around the track, including the straight side of the track; while Clark only ran a 100-meter along the straight side of the track.

<em>Hence, </em><em>Dora</em><em> must have traveled a greater distance.</em>

Dora finished the race where she started it, her change in position or displacement is zero. Clark finished the race at a different point from their starting position.

<em>Hence, </em><em>Clark</em><em> a greater change in position than Dora.</em>

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if it is true that the net charge in the universe does not change, how is it ever possible to charge an object that was initiall
olga55 [171]

By transferring electrical charges from one object to another

Explanation:

The law of conservation of electric charge states that the total electric charge of the universe is constant, therefore no charge can be created or destroyed, but only transferred.

Indeed, when an object is charged, this is due to the fact that charge carriers (typically electrons) are transferred to/from the object.

Consider an object initially neutral: this means that the object has initially an equal amount of positive charges (protons) and negative charges (electron).

Later, if we remove electrons from the object, then it will remain with an excess of protons: therefore, it will be positively charged. However, the electrons have not disappeared: simply, they have been moved somewhere else (on another object, for example, which will become negatively charged: so, the total net charge will still be zero).

Similarly, if we add electrons to the object, it will become negatively charged: however, the electrons have been removed from another object which is now positively charged, so the net charge still has not changed.

Learn more about electric charges:

brainly.com/question/8960054

brainly.com/question/4273177

#LearnwithBrainly

8 0
3 years ago
A well-insulated electric water heater warms 131 kg of water from 20.0°C to 51.0°C in 31.0 min. Find the resistance (in Ω) of it
Nookie1986 [14]

Answer:

Explanation:

Heat required to warm the water from 20 degree to 51 degree

= mct

= 131 x 4150 x ( 51 - 20 )

= 16853150 J

Power of heating element

= v² /R

Heat generated in 31 min

= (v² / r ) x 31 x 60 = 16853150

r = (240 x 240 x 31 x 60) / 16853150

6.35 ohm

In this case heat required will change so time will also change

Heat required =

131 x 4150 x ( 100-51  )

= 26638850 J

If time required be t hour

Energy consumed

Power x time

=  (v² / r ) x t  x 60 = 26638850

t  = 26638850 x 6.35 / (240 x 240 x 60 )

= 48.95 h

Heat required to evaporate water at 100 degree

= mass x latent heat

= 131 x 2260000

= 296060000 J

Total heat required

= 296060000 + 26638850 + 16853150

= 339552000 J

time required = 339552000 x 6.35 / (240 x 240 x 60 )

= 623.88 h .

3 0
3 years ago
Why reverberation doesn't occur in well furnished room?​
yaroslaw [1]

Answer:

It is because the room is occupied with stuffs.

Explanation:

In a well furnished room there are things

like bed, cupboard, wardrobe and other stuffs, So they act as absorbing materials.

They absorb sound and do not give a chance to resounds.

8 0
3 years ago
If 31.25
valentina_108 [34]
<span>1 C = 6.24150965(16)×10^18 electrons

31.25 x 10^18 electrons / (6.24150965(16)×10^18 electrons / C) = 5.007 Coulombs

</span><span>I hope this helps. </span>
4 0
3 years ago
Read 2 more answers
A 20-pound object is dropped from a 50-foot bridge onto the ground below it. A 50-pound object is dropped from a 100-foot cliff
Anvisha [2.4K]

Answer:

here 20 lb object will hit the ground first

Explanation:

Acceleration of the object while it is dropped in air is given as

F = mg

a = \frac{F}{m}

a = g

so acceleration of the object is independent of the mass of the object

now time to reach the ground is given as

h = \frac{1}{2}gt^2

t = \sqrt{\frac{2h}{g}}

for 20 pound object

t_1 = \sqrt{\frac{2(50)}{32}}

t_1 = 1.77 s

for 50 pound object

t_2 = \sqrt{\frac{2(100)}{32}}

t_2 = 2.5 s

5 0
3 years ago
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