Homework Statement
Two identical loudspeakers
are driven in phase by the same amplifier at a frequency of 680 Hz. The
speakers are 4.6 m apart. An observer stands 9 m away
from one of the speakers as shown. The observer
then starts moving directly towards the closest speaker.
How far does the...
Homework Statement
A molecule of DNA (deoxyribonucleic acid) is 2.10 μm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.09% upon becoming charged. Determine the effective spring constant...
Homework Statement
For the reaction below, the constant pressure heat of reaction is qp = −3256 kJ mol−1 at 25 °C. What is the constant volume heat of reaction, qV , at 25 °C?
16 CO(g) + 33 H2(g) ⟶ C16H34(l) + 16 H2O(l)
Enter your answer in kJ mol−1, rounded to the nearest kilojoule...
Homework Statement
A gas sample containing 3.00 moles of Helium gas undergoes a state change from 30 degrees celsius and 25.0 L to 45 degrees celsius and 15.0 L. What is the entropy change for the gas (ideal gas)? For He, Cp = 20.8 J/k*mol
Homework Equations
ΔS = Cv*ln(Tf/Ti) + nR*ln(Vf/Vi) =...
It is equal to 1 atm * 19.367 L
So to convert 19.367 atm*L to joules, I will multiply by 101.325 J
so work is equal to +1962.36 J ?
Edit: so to get the change in internal energy I just simply add work to q
1. Homework Statement
What are the values of q, w, ΔU, ΔH for the following constant pressure process for a system containing 0.596 moles of CH3OH ?
CH3OH(g, 123.0 ºC, 1.00 atm) ⟶ CH3OH(l, 30.0 ºC, 1.00 atm)Molar heat capacity for CH3OH(g), Cp,m = 44.1 J K−1 mol−1
Molar heat capacity for...
Homework Statement
If I am asked to give my answer in acceptable SI units and to 3 significant figures, how would I express my answer?
Homework Equations
Answer: 589883.4263 J
The Attempt at a Solution
My instinct would be to put this in KJ, but I don't know if that's an "acceptable SI...
Homework Statement
A flower pot is knocked off a window ledge from a height
d = 21.6 m
above the sidewalk as shown in the figure below. It falls toward an unsuspecting man of height
h = 1.71 m
who is standing below. Assume the man below requires 0.300 s to respond to a warning. How close to...
Homework Statement
What is w when a gas is compressed from 42.1 L to 25.1 L using a constant external pressure of 739 Torr? Remember to include a "+" or "−" sign as appropriate.
Homework Equations
W = -P(dV)
The Attempt at a Solution
Pressure = (739 Torr / 760 Torr)*(101.325 kPa)
W =...
Ah, thanks, I finally got the correct answer, but what do you mean I didn't have to find the oscillation frequency?
I feel a bit stupid to say this but the equations in my textbook are of the form: a = -Aω^2cos(2pi*f*t)