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ICE Princess25 [194]
4 years ago
5

Liquid water heats up and cools down slowly. What causes this property?

Physics
1 answer:
Alja [10]4 years ago
3 0

Answer:

water forms hydrogen bonds

Explanation:

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Steve is whirling a rubber cork, tied with a string to his finger, over his head as shown in the figure. The motion of the cork
I am Lyosha [343]

The tension in the string corresponds to the gravitational attraction between the Sun and any planet.

6 0
3 years ago
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A 23.0 kg child plays on a swing having support ropes that are 2.10 m long. A friend pulls her back until the ropes are 45.0 deg
Romashka [77]

Answer:

a. 139.748J

b.3.486m/s

c.zero

Explanation:

a. Given the mass of the child as 23.0kg, rope length is 2.1mand incline is 45°

Potential energy during release is calculated as:PE=mgh

#Find vertical difference of when the swing is at rest (2.1m) and when the child is pulled back.

Find the height when the child is pulled back:

cos 45\textdegree=y/2.10\\\\y=1.48m

#therefore,vertical difference is 2.1m-1.48m=0.62m

\therefore PE=mgh\\\ \ =23.0kg\times 9.8m/s^2\times 0.62m\\\ \ =139.748J

#Hence the potential energy during release is 139.748J

b. From a, above, we have PE=139.748J, M=23.0kg.

At the bottom, all the PE will be transferred into KE. Potential energy is calculated as:

KE=0.5mv^2\\\\mv^2=2KE\\\\v=\sqrt{2KE/m}\\\\v=\sqrt{2\times 139.748J/23.0}\\\\v=3.486m/s

#Hence the velocity at the bottom of the swing is 3.486m/s

c. Work is calculated as the product of force by distance.

From a, b above we have mass as 23.0kg .

-since the distance of the ropes remained constant the change in distance is zero:

W=mgd\\=23.0\times 9.8m/s^2\times 0\\=0

Therefore the work in the ropes is 0,zero.

8 0
3 years ago
What is the current in the 10.0 resistor?
Flura [38]

Answer:

12.0V

12.0V

Explanation:

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8 0
3 years ago
El monoxido de carbono reacciona con el hidrogeno gaseoso para producir metanol (ch3oh) calcule el reactivo limite y el reactivo
Orlov [11]

Answer:

Se obtienen 2,27 gramos de metanol.

Explanation:

La reacción entre monóxido de carbono e hidrógeno para producir metanol es la siguiente:

CO + 2H₂ → CH₃OH  

Para encontrar el reactivo limitante y el reactivo en exceso, debemos calcular el número de moles de CO y H₂:

\eta_{CO} = \frac{m}{M}              

En donde:    

m: es la masa

M: es el peso molecular  

\eta_{CO} = \frac{m}{M_{CO}} = \frac{2,0 g}{28,01 g/mol} = 0,071 moles

\eta_{H_{2}} = \frac{2,0 g}{2,02 g/mol} = 0,99 moles

Dado que la relación estequiométrica entre CO y H₂ es 1:2, el número de moles de hidrógeno gaseoso que reaccionan con el monóxido de carbono es:

\eta_{H_{2}} = \frac{2}{1}*0,071 = 0,142 moles      

Entonces, se necesitan 0,142 moles de H₂ para reaccionar con 0,071 moles de CO y debido a que se tienen más moles de H₂ (0,99 moles) entonces el reactivo limitante es CO y el reactivo en exceso es H₂.

Ahora podemos encontar la masa de metanol obtenida usando el reactivo limitante (CO) y sabiendo que la realcion estequiométrica entre CO y CH₃OH es 1:1.    

\eta_{CH_{3}OH} = \eta_{CO} = 0,071 moles

m = 0,071 moles*32,04 g/mol = 2,27 g

Por lo tanto, se obtienen 2,27 gramos de metanol.

Espero que te sea de utilidad!      

6 0
3 years ago
If you were to choose one, which of Earth's spheres is the most important, and why?
Molodets [167]

Earth's land makes up the geosphere.

Earth's water makes up the hydrosphere. ...

Earth's air makes up the atmosphere. ...

Earth's living things make up the biosphere. ...

The four spheres interact. ...

Humans can have major impacts on all the spheres.

pick one

7 0
3 years ago
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