Answer:
Q=mcΔT
Explanation:
The formula for expressing the amount of heat transferred between energy stores is given by the equation. The specific heat capacity of water is 4180 J/kgoC (Joules per kilogram per degree), this means it takes 4180 J of heat energy to raise the temperature of 1 kg of water by 1oC.
782g
Explanation:
Given parameters:
Number of moles of N₂ = 23moles
Unknown:
Mass of NH₃ = ?
Solution:
We first obtain the balanced chemical equation for this reaction;
N₂ + 3H₂ → 2NH₃
From the equation we see that;
1 mole of N₂ produced 2 moles of ammonia
23 mole of N₂ will yield 2 x 23 = 46moles of ammonia
Now ;
mass of ammonia = number of moles x molar mass
Molar mass of NH₃ = 14 + 3(1) = 17g/mol
Mass of ammonia = 46 x 17 = 782g
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Refer to the diagram shown below.
In geosynchronous orbit, the satellite makes one circular revolution at the equator in 1 day.
From tables, obtain
r = 42,164 km = 4.2164 x 10⁷ m, the earth's radius
g = 9.8 m/s², acceleration due to gravity.
Note that 1 day = 86400 s
The angular velocity of rotation is
ω = (2π)/86400 = 7.2722 x 10⁻⁵ rad/s
The centripetal acceleration on the satellite is
a = rω²
= (4.2164 x 10⁷ m) * (7.2722 X 10⁻⁵ rad/s)²
= 0.223 m/s²
The weight of the 2000 kg satellite is
W = m(g - a)
= (2000 kg) * (9.8-0.223 m/s²)
= 19154 N
= 19.154 kN
Answer: 19 kN (nearest integer)
C.a battery powering a cell phone