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3 years ago

How much energy is required to change a 39.0-g ice cube from ice at -14.0°c to steam at 108°c?

1 answer:

7 0

Heat is added to the mass as follows:
Q_-14-0 = mC_iΔT = 39*2.06*(0--14) = 39*2.06*14 = 1124.76 J
Q_0 = mC_f = 39*334 = 13026 J
Q_0-100 = mC_wΔT = 39*4.18*100 = 16302 J
Q_100 = mC_v = 39*2230 = 86970 J
Q_100-108 = mC_sΔT = 39*2.03*(108-100) = 39*2.03*8 = 633.36J

Q = Summation of all the heats added = 1124.76+13026+16302+86970+633.36 = 118056.12 J ≈ 118.06 kJ

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how much heat is lost when 71.07g of steam at 100 degrees condenses to form liquid water at 100 degrees

alukav5142 [94]

Answer:

Q = 160.36[kJ], is the heat lost.

Explanation:

This is a thermodynamic problem where we can find the latent heat of vaporization, at a constant temperature of 100 [°C].

We know that for steam at 100[C], the enthalpy is

$h_{gas} = 2675.6[kJ/kg]$

For liquid water at 100[C], the enthalpy is

$h_{water} = 419.17[kJ/kg]$

Therefore

$h_{g-w} = 2675.6-419.17 = 2256.43[\frac{kJ}{kg} ]$

The amout of heat is given by:

$Q=h_{g-w}*m\\ where:\\m = mass = 0.07107[kg] = 71.01[g]\\Q = heat [kJ]\\Q =2256.43*0.07107\\Q=160.36[kJ]$

3 0

3 years ago

A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the drive train, and 70% reaches the wheels.

shutvik [7]

Answer:

a = 6.53 m/s^2

v = 11.5689 m/s

Explanation:

Given data:

engine power is 217 hp

70 % power reached to wheel

total mass ( car + driver) is 1530 kg

from the data given

2/3 rd of weight is over the wheel

w = 2/3rd mg

maximum force

$F = \mu W$

we know that F = ma

$ma = \mu (2/3 mg)$

$a_{max} = 2/3(1.00) (9.8) = 6.53 m/s^2$

the new power is $p = 70\% P_[max} = 0.7 P_{max}$

$P =f_{max} v$

$0.7P_{max} = ma_{max} v$

solving for speed v

$v =0.7 \times \frac{P_{max}}{ma_{max}}$

$v = 0.7 \frac{217 [\frac{746 w}{1 hp}]}{1500 \times 6.53}$

v = 11.5689 m/s

7 0

4 years ago

What is meant by a charge carrier hole in a semiconductor? Can it be created in a conductor?

lara [203]

Answer:

The materials used to make electronic components like transistor and integrated, circuit behave as if effective particles known as electron through them, causing electrical properties

6 0

4 years ago

Consider three force vectors F~ 1 with magnitude 43 N and direction 38◦ , F~ 2 with magnitude 26 N and direction −140◦ , and F~

Rama09 [41]

Answer:

34.70 N

Explanation:

Given :

F~ 1 = 43 N in direction 38◦

F~ 2 = 26 N in direction −140◦

F~ 3 = 27 N in direction 110◦

Therefore,

F~x = 43 cos (38) + 26 cos (-140) + 27 cos (110)

= 43 (0.7) + 26 (-0.7) + 27 (-0.3)

= 3.8

F~y = 43 sin (38) + 26 sin (-140) + 27 sin (110)

= 43 (0.6) + 26 (-0.6) + 27 (0.9)

= 34.5

so, F~ = $\sqrt{3.8^2 + 34.5^2}$

= 34.70 N

6 0

3 years ago

a steam engine work on its vicinity 285 k heat is released with the help of 225 c energy absorbed to the system what is the effi

zvonat [6]

The efficiency of steam engine is 26.66 %.

<h3>What is Efficiency?</h3>

The efficiency is defined as the work done by the engine divided by the heat supplied.

Work done is the difference between the heat supplied and heat rejected.

So, efficiency η = (Qs -Qr) / Qs

Given is the heat supplied Qs = 225 Joules and heat rejected Qr =285 . then the work done is

W = 225 -225 = - 60 Joules

Efficiency η = 60/225 x 100%

η = 26.66 %

Thus, the efficiency of the steam engine is 26.66 %.

Learn more about efficiency.

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8 0

2 years ago

Read 2 more answers