Answer:
sound waves in air and water are longitudinal. Their disturbances are periodic variations in pressure that are transmitted in fluids. Figure 13.5 the wave on a guitar string is transverse
Answer:
Yeah chemical change occurs when you fry an egg since the whites harden and change shape in a way. Mass is conserved since it doesn't change.
B.) Three electrons are lost, creating Al^3+
Answer:
a) Pex = 15 bar
b) work = 3000 J
Explanation:
<u>Step 1: </u>Data given
Volume of the gas = 2.5 dm³
Pressure of the gas = 3.00 bar
The gas is compressed at a constant pressure pex , so that the final volume is 0.5 dm³
The final temperature is the same as in the beginning.
<u>Step 2:</u> Calculate Pex
If the gas is compressed isothermally ( =constant temperature), then via the ideal gas law we can write:
P2 =Pex = (P1*V1)/V2
Pex = (3 * 2.5)/0.5
Pex = 15 bar
<u>Step 3:</u> Calculate the work
If Pex is constant, then is:
w = −
∫Pex *dV = -Pex *ΔV = -15 *(0.5-2.5)dm³ = 30dm³ bar
30dm³ bar * 10^5 Pa
/bar * 0.1³ m³/dm³ =3000 kg*m²/s² = 3000 J