You calculated the density correctly.
When you drop anything into a fluid . . .
-- If the object is MORE dense than the fluid, it sinks.
-- If the object is LESS dense than the fluid, it floats.
A. 409 Hz
The fundamental frequency of a string is given by:

where
L is the length of the wire
T is the tension in the wire
m is the mass of the wire
For the piano wire in this problem,
L = 0.400 m
T = 1070 N
m = 4.00 g = 0.004 kg
So the fundamental frequency is

B. 24
For this part, we need to analyze the different harmonics of the piano wire. The nth-harmonic of a string is given by

where
is the fundamental frequency.
Here in this case

A person is capable to hear frequencies up to

So the highest harmonics that can be heard by a human can be found as follows:

Answer:
The force of the car is 15000N.
Explanation:
The unit of force is Newtons (N), so based on the question, the force is 15000 Newtons.
I am pretty sure that <span>the following whihc cannot be determined by looking at the phase diagram is definitely </span>D. system pressure. I consider this one to be correct because only this point is not included into<span> phase diagram and can't be determined itself. Hope it will help! Regards!</span>
Answer:10.667 m/s
Explanation:
Given
For First half students travel for 18 m/s for 10 min
For second half students travel for 6 m/s for 20 min
For last half students travel for 12 m/s for 15 min
average Speed

