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GREYUIT [131]
3 years ago
5

What is the moment of inertia of a disc of mass 5kg and radius 10cm?

Physics
2 answers:
vodka [1.7K]3 years ago
6 0

Answer:

500

Explanation:

Lelu [443]3 years ago
3 0
I=1/2MR²
I=1/2(5 kg)(0.1 m)²
I=0.025 kg/m²
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A vertical piston-cylinder device initially contains 0.1 m^3 of air at 400 K and 100 kPa. At this initial condition, the piston
jenyasd209 [6]

Answer:

Q=-38.15kJ

Explanation:

From the question we are told that

Piston-cylinder initial Volume of air v_1=0.1 m^3

Piston-cylinder initial temperature T_1=400k

Piston-cylinder initial pressure P_1= 100kpa

Supply line temperatureT_s=400k

Supply line pressure P_s= 500kpa

Valve  final pressure P_v=500kpa

Piston movement pressure P_m=200kpa

Piston-cylinder final Volume of airv_2=0.2 m^3

Piston-cylinder final temperature T_2=440k

Piston-cylinder final pressure P_2= 500kpa

Generally the  equation for conservation of mass is mathematically given by

Q=m_2 \mu_2-m_1 \mu_1 +W-(m_2-m_1)h

where

Initial moment

m_1=\frac{p_1 V_1}{RT_1}

m_1=\frac{100*0.1}{0.287*400}

m_1=8.7*10^-^2kg

Final moment

m_2=\frac{p_2 V_2}{RT_2}

m_1=\frac{500*0.3}{0.287*440}

m_1=79*10^{-2}kg

Work done by Piston movement pressure

W=Pd

W=P(v_2-v_1)

W=200(0.2-0.1))

W=20000J

Heat function

h=cT_1

h=1.005(400)

h=402

Therefore

Q=(0.792*0.718(440)-0.0871*0.718(400)+20-(0.792-0.087)*402))

Q=-38.15kJ

It is given mathematically that the system lost  or dissipated Heat of

Q=-38.15kJ

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3 years ago
When you need to pass a motorcycle, _____________.A. move into the left lane to pass the motorcycle B. pass to the left using th
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Answer:

A) move into the left lane to pass the motorcycle

Explanation:

According to law, when it is needed to pass other vehicles, it requires you to only pass other vehicles on the left (using the left lane).  

When passing a motorcyclist, remember to give him/her the same full lane width as other vehicles. Never drive in the same lane with a motorcyclist, even if the lane is wide enough to fit your vehicle and the motorcyclist.

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One of the principal difficulties in establishing the theory of continental drift (the idea that tectonic plates drift around on
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