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Alika [10]
3 years ago
10

How much heat is required to vaporize 1.5kg of liquid water at its boiling point

Physics
1 answer:
Dafna11 [192]3 years ago
3 0

Given:

Water, 1.5kg at boiling point

Required:

Heat required to vaporize at boiling point

Solution:

Water at boiling point is at 100degrees Celsius

Changing it into Kelvin, just dd 273 to 100 = 373 K

H = mCpT

H = (1.5kg)(4.184kJ/kg-K)(373K)

<span>H = 2340.9kJ</span>

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An astronaut's pack weighs 17.5 N when she is on earth, but only 3.24 N when she is on the surface of an asteroid. What is the a
Nimfa-mama [501]

Answer:

a= 1.81 m/s²

Explanation:

Ratio of the weights on both surfaces can be calculated as,

\frac{W_{a} }{W_{E} }=\frac{ma}{mg}

Here;

   Wa is the weight on the asteroid,       W_{E} is weight on earth,

         m is mass of pack,          a is acceleration due to an asteroid and

         g is acceleration due to gravity.

         Rearrange above equation for a,

           a=g (\frac{Wa}{W_{E} })

Substitute 3.24 N for Wa,       17.5 N for  W_{E},

          9.81 m/s² for g in the above equation,

          a= 9.81(\frac{3.24}{17.5})

          a= 1.81 m/s²

7 0
4 years ago
Compare and contrast four types <br> of friction
malfutka [58]
Some of these frictions depend on the Pressure, temperature of atmosphere.

Static Friction: This is the  friction force when two objects in contact  are not moving relative to each other. This friction is higher than kinetic friction.

Kinetic or Dynamic friction: this the friction force opposing the motion of objects, when two objects in contact are in motion relative to each other.  It is less than the static friction. The two surfaces are rubbing against each other as they move.

Rolling friction:  This is the friction when two objects are in contact and one object is rolling over the other - like a wheel on a road. The point of contact appears as stationary. The rolling friction is very less compared to static friction & dynamic friction.

Lubricated friction: this is the friction between two solid surfaces in contact with a layer of lubricant fluid flowing in between them. This friction is the least.

Fluid friction - viscosity :  this is friction between two adjacent layers that are moving relative to each other at different speeds in a fluid.  This is not high.

Internal friction: when an object is compressed and forced to deform, like in a piece of rubber, there is friction between the layers, that opposes this deformation.

Skin friction is the friction that opposes movement of a fluid across a solid surface.  This is also called drag.  When a coin is dropped in water, there is a friction called drag on the coin. Same is the case when a ball is thrown, a drag is experienced by the ball due to the drag of air.

6 0
3 years ago
A certain unbalanced force gives a 5kg object an acceleration of 15 m/s2. What would be the acceleration if the same force was a
stira [4]

Answer:

a2 = 2.5 m/s2

Explanation:

F1 = m1 a1 We use the same force so F1 = F2

= 5kg × 15m/s2 F2 = m2 a2

= 75N a2 is required

a2 = F2 / m2

= 75N / 30 kg

= 2.5 m/s2

7 0
4 years ago
What are the constituent metals of stainless steel?
bogdanovich [222]

<span>Stainless steel is a metal alloy that made up mainly of carbon and chromium. In combination with low carbon contents, chromium is highly reactive element that imparts remarkable resistance to corrosion and heat.</span>

Moreover, stainless steel is mixed up with sufficient nickel, which is an essential allying element in the series of stainless steel grades. Other components are manganese, molybdenum, silicon, titanium, aluminum, niobium, copper, nitrogen, and sulfur.

 

6 0
3 years ago
A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decr
Morgarella [4.7K]

Explanation:

Below is an attachment containing the solution.

7 0
3 years ago
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