käännösapua
1.
Auton kiihtyvyydeksi ilmoitetaan 9,5 s nollasta sataan kilometriin tunnissa.
-Laske auton keskikiihtyvyys yksiköissä m/s^2
-Kuinka pitkän matkan auto kiihdytyksessä (9,5 s) kulkee?
Auton kiihtyvyys oletetaan vakioksi.
2.
Poltettaessa yksi kilogramma polttoöljyä vapautuu noin 42 MJ energiaa. Oletetaan, että 80% tästä voidaan hyödyntää. Erään omakotitalon lämpöhäviöt talvella kovalla pakkasella ovat 4,0 kW. Kuinka paljon polttoöljyä vuorokaudessa tulee polttaa (siis hyötysuhde 80%) omakotitalon lämmittämiseksi (4,0 kW:n teho).
3.
Ilmastointiputken halkaisija on 125 mm. Siinä virtaavan ilman nopeus on 1,2 m/s.
-Laske tilavuusvirta (litraa/s) ilmastointiputkessa.
-Putki kapenee halkaisijaan 80 mm. Mikä on ilman nopeus tälloin?
Hello my friend. I've got some physics problem in Finnish needed to translate into English so that I can understand and solve them. Please help me to translate them.
Thank you very much.
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Answers · 1
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1. The acceleration of the car is given as 9.5 s from zero to one hundred kilometers per hour (100 km/h).
- calculate the mean acceleration(?) of the car in the unit m/s^2
- During the 9.5 s acceleration, how far does the car travel?
The acceleration of the car is assumed to be constant.
2. When burning a kilogram of fuel oil about 42 MJ of energy is released. Assume, that 80 % of this can be utilized. The loss of heat of a detached house at winter in severely cold weather (several minus degrees celsius) is 4.0 kW. How much fuel oil should be burned within a day (with 80 % efficiency) to warm the detached house (4.0 kW power).
3. The diameter of a ventilation pipe is 125 mm. The velocity of the air flowing in the pipe is 1.2 m/s.
- Calculate the volumetric flow (liters/s) in the ventilation pipe
- The pipe tapers to the diameter of 80 mm. What is the velocity of air then?
Here you are. :)
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