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Alona [7]
3 years ago
9

500cm3 of water is to be jeated from room temperature 28oc to 100oc in order to prepare ahot cup pf coffee. What os the minimum

heat required
Physics
1 answer:
klasskru [66]3 years ago
7 0

Answer:

The minimum heat required is 171626 joules.  

Explanation:

By First Law of Thermodynamics, the amount of heat (Q), in joules, is equal to the change in internal energy of water. The minimum heat required is the sensible heat necessary to heat up the water. That is:

Q = \rho\cdot V \cdot c\cdot \Delta T (1)

Where:

\rho - Density of water, in kilograms per cubic meter.

V - Volume of water, in cubic meters.

c - Specific heat of water, in joules per kilogram-degree Celsius.

\Delta T - Change in temperature, in degrees Celsius.

If we know that \rho = 1000\,\frac{kg}{m^{3}}, V = 5\times 10^{-4}\,m^{3}, c = 4186\,\frac{J}{kg\cdot ^{\circ}C} and \Delta T = 82\,^{\circ}C, then the minimum heat required is:

Q = 171626\,J

The minimum heat required is 171626 joules.  

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A spaceprobe in outer space is flying with a constant speed of 1.795 km/s. The probe has a payload of 1635.0 kg and it carries 4
erma4kov [3.2K]

The speed by which the spaceprobe travels when all the rocket fuel is used up will be 29.262 m/sec.

<h3>What is the law of conservation of linear momentum?</h3>

According to the law of conservation of linear momentum before the collision is equal to the momentum after the collision. These laws state how momentum gets conserved.

Unit conversion;

1 km/sec = 1000 m/sec

Given data;

Spaceprobe speed  = 1.795 km/s = 1795 m /sec

Probe mass = 635.0 kg

Fuel mass = 4092.0 kg

Expelled propellent velocity = 4.161 km/s = 41461 m/sec

From the momentum conservation principle;

\rm P_i = P_f \\\\ (m_p+m_f)v_i = m_pV - m_fv_p \\\\ V = \frac{(635+4092)1795+4092 \times  41461}{635} \\\\ V = 280540.7 \ m/sec \\\\ V = 28.05 m/sec

Hence, the speed by which the spaceprobe travels when all the rocket fuel is used up will be 29.262 m/sec.

To learn more about the law of conservation of momentum refer to:

brainly.com/question/1113396

#SPJ1

7 0
2 years ago
Two clowns are launched from the same spring-loaded circus cannon with the spring compressed the same distance each time. Clown
sweet-ann [11.9K]

Answer:

the kinetic energy of clown A is 0.444 times the kinetic energy of clown B.

Explanation:

Let the spring constant of the spring is k.

For clown A:

m = 40 kg

let the extension in the spring is y.

So, the spring force, F = k y

m g = k y

40 x g = k x y

y = 40 x g / k      ..... (1)

For clown B:

m' = 60 kg

Let the extension in the spring is y'.

So, the spring force, F' = k y'

m' g = k y'

y' = 60 x g / k      .....(2)  

Kinetic energy for A, K = 1/2 ky^2

Kinetic energy for B, K' = 1/2 ky'^2

So, K/K' = y^2/y'^2 K / K' = (40 x 40) / (60 x 60)     (from equation (1) and (2))

K / K' = 0.444

K = 0.444 K'

So the kinetic energy of clown A is 0.444 times the kinetic energy of clown B.

5 0
3 years ago
What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova
DaniilM [7]
These answers aren´t valid .

The correct answer will be:

Planetary system.
5 0
4 years ago
Two charged particles exert an electric force of 27 N on each other. What will the magnitude of the force be if the distance bet
Elena-2011 [213]

Answer:

243 N

Explanation:

The formula for electromagnetic force is F= Kq1q2/r^2

where r is the distance between the charges, if the distance between the charges is reduced by 1/3 then F will increase by 9 [(1/3r)^2 becomes 1/9r which is 9F] so 27*9 is 243N

4 0
3 years ago
Energy is transferred by the process of convection from the hot water at the bottom of the tank to the cooler water at the top.
iragen [17]
The transfer of energy means, in convention process, transport of matter. In this case, hot water has lower density than cool water. The water with less density ascends and leaves gaps that are occupied with cooler water "packages".
7 0
3 years ago
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