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Allisa [31]
3 years ago
15

The universe consists of many galaxies. Which choice correctly identifies our home galaxy and its type?

Physics
1 answer:
White raven [17]3 years ago
8 0

Answer:

B

Explanation:

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How much heat is required to change 1.0 kg of ice, originally at -20.0 degrees celcius, into steam at 110.0 degrees celcius? Ass
Marizza181 [45]

Answer:

Q = 3087460 J

Explanation:

As we know that first ice will convert into water

then water will heat to 100 degree celcius and then it will converted into vapor and then its temperature is raised to 110 degree C

First we will find the heat to take the ice at 0 degree and then convert it into water

Q_1 = ms_{ice}\Delta T + mL

Q_1 = 1(2100)(0 - (-20)) + 1(335000)

Q_1 = 42000 + 335000 = 377000 J

Now heat required to take it to 100 Degree then convert into vapor and then raise temperature to 110 degree

Q_2 = 1(4186)(100 - 0) + (1)(2250000) + 1(4186)(110 - 100)

Q_2 = 2710460 J

So total heat required is given as

Q = Q_1 + Q_2

Q = 377000 + 2710460

Q = 3087460 J

5 0
3 years ago
What provides the centripetal force needed to keep Earth in orbit?
laiz [17]

option C ............

8 0
3 years ago
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A 2kg box is pushed along a flat frictionless surface with an applied force of 53.91newton j+19.62 j were j is horizontal and j
tamaranim1 [39]

Since the box doesn't move vertically at all, no work is done by the vertical component of the force.

If 53.91 Newtons is the horizontal component of the force (very unclear in the question), then the work done is

<u>Work = (force) x (distance)</u>

Work = (53.91 N) x (10 m)

<em>Work = 539.1 Joules</em>

<u>Power = (work done) / (time to do the work)</u>

Power = (539.1 joules) / (90 sec)

Power = (539.1/90) (joule/sec)

<em>Power = 5.99 watts</em>

=====================================

Note:  If the mass of the box is only 2 kg, and you push it along the surface with a constant force of 53⁺ Newtons, and the surface really is frictionless, then that box is gonna cover a WHOOOOOLE LOT more than 10 meters in 90 seconds.  I get 109,168 meters !

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3 years ago
Why did Rita's hands get hot when she rubbed them ?
Setler79 [48]

Answer:

due to production of heat through friction

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3 years ago
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What will happen if you rub two different materials together?
Dafna1 [17]
It will cause heat from friction
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3 years ago
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