New lab
e # testportal. net/exam/DoTestQuestion. html
Testname: Physics - Par exam z mensiv...
![subject](/tpl/images/cats/fizika.png)
Physics, 12.07.2021 14:00 kanajahbunn
New lab
e # testportal. net/exam/DoTestQuestion. html
Testname: Physics - Par exam z mensive group
Time Tent to complete the rest un to min. To Sec
Question 12/21 (4 p.)
10 grams of aluminium heated from -20°C to 800*C. The specific heat of aluminium is 900 J/kg °C (for solid and liquid aluminium as well),
the heat of solidification is 400 kJ/kg, and the melting point is 660 °C.
Calculate
a. The energy required to heat the aluminium to its melting point
b. The energy required to melt the whole amount
c. The energy that the entire process requires
In the space below write only the answers you calculated (only the values + unit)
Paragraph
DD (1)
BI X2 x 2
X x 2 ©
A
a
P
Answer auto-saved at: 9:56:27 AM
1 WORDS POWERED BY TINY
Type here to search
gi
E
27°C
* !
9:57 am
12/07/2021
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 07:40
Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents
Answers: 2
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 18:00
Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling â the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the systemâs thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 19:50
The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 Ă 10-6 Ï·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 Âą per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to itâs resistivity when at operating temperature? explain.
Answers: 3
You know the right answer?
Questions
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/en.png)
English, 14.04.2021 18:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mkx.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 14.04.2021 18:30
![question](/tpl/images/cats/istoriya.png)
History, 14.04.2021 18:30
![question](/tpl/images/cats/mat.png)
Mathematics, 14.04.2021 18:30
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 14.04.2021 18:30
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 14.04.2021 18:30
![question](/tpl/images/cats/en.png)
English, 14.04.2021 18:30
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 14.04.2021 18:30
![question](/tpl/images/cats/mat.png)
Mathematics, 14.04.2021 18:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 14.04.2021 18:30
![question](/tpl/images/cats/en.png)