Answer:
a.87.6 m/s
b.18.25 Hz
Explanation:
the equation for the wave speed is expressed as

where v is the speed,
T is the tension in Newton
l is the length
and m is the mass
Now since

by substituting values into the equation, we have

b. the expression for the frequency is giving as
.
Note we 2L as the wavelength because we solving for the fundamental frequency as stated in the question.
Answer:
10m/s^2
Explanation:
Force = mass x acceleration
Acceleration = force/ mass
= 20000000/2000000
=10m/s^2
Mercury, Venus, Earth, and Mars are considered terrestrial planets because those planets are mainly composed of metal or rock and are closest to the sun.
The longitude based on the time difference is 15 degrees.
<h3>Longitude of complete rotation of the Earth</h3>
The longitude of a complete rotation of the earth in a 24 hours is calculated as follows;

<h3>Time difference</h3>
The time difference between the local apparent solar time and the Greenwich time is calculated as follows;

Since it is one hour time difference, the longitude is 15 degrees.
Learn more about Earth longitude here: brainly.com/question/1939015