Explanation:
Energy is involved in changes of state because the energy of particles of matter determines the matter's state.
Changes of state are physical changes in matter.
Energy must be absorbed to change a liquid to a gas.
Sublimation is solid to gas (no liquid involved).
1 D
2 False
3 True
4 D
The rate of energy absorption from the outdoor air is 4400 KJ/h
<u>Explanation:</u>
Coefficient of performance (COP), is an expression of the efficiency of a heat pump. When calculating the COP for a heat pump, the heat output from the condenser (Q) is compared to the power supplied to the compressor (W).
The coefficient of performance,
We replace the value in the equation with given data,
By making a conversion, we get
The energy balance,
Now, replace the values in the equation, we get
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Answer:
5 years
Explanation:
The centripetal acceleration of a planet is equal to the acceleration due to gravity.
ac = g
Centripetal acceleration is:
ac = v² / r
where v is velocity and r is radius of travel.
Acceleration due to gravity is:
g = GM / r²
where G is gravitational constant, M is the mass of the sun, and r is the radius of travel.
Therefore:
v² / r = GM / r²
v² = GM / r
v = √(GM / r)
Distance is speed times time, so:
d = v t
2πr = √(GM / r) t
t = 2πr √(r / (GM))
t = 2π √(r³) / √(GM)
We know that when r = 1 AU, t = 1 year.
1 = 2π √(1³) / √(GM)
1 = 2π / √(GM)
2π = √(GM)
Substituting:
t = 2π √(r³) / (2π)
t = √(r³)
When r = 3AU:
t = √(3³)
t = 5.2
Planet B takes approximately 5 years to orbit the sun.