Answer:
a. 
b. = 40 km/ million years
Explanation:
The computation is shown below;
According to the question, Data provided in the question
Average speed = 4.0 cm / per year
Distance move in 1 second at this speed
Based on the above information
a. For distance move in 1 second is
As we know that

b. For speed per kilometer per million years is

= 40 km/ million years
Answer:
The answer to your question is Ep = 73.6 Joules
Explanation:
Data
mass = 2.5 kg
height = 3 m
gravity = 9,81 m/s²
Potential energy = ?
Potential energy is the energy stored in an object due to its position, the highest the object be, the highest the potential energy.
Formula
Pe = mgh
Substitution
Ep = (2.5)(9.81)(3)
Simplification and result
Ep = 73.6 Joules
The answer is C!!!XD
Hope this helped!!!XD
Also, can I get brainliest please? I only need 2 more:D
Answer:A)For open pipe
1stπ=484cm
2nd wavelength=161.3cm
3rd is=96.8cm
B)For closed pipe
1st wavelength=242cm
2nd=121cm
3rd wavelength=80.7cm
Explanation:
An open pipe produces a standing waves whose wavelength is related to it's length(length of pipe) by nL/4=π ,where n represent odd integers 1,2,3...
So the first note called fundamental note or 1st Harmonic is L=π/ 4,121=π/ 4
π= 121×4=484cm
Third harmonic,L=3π /4
So π= 4l/3=4×121/3=161.3cm
The 3rd wavelength is
Fifth harmonic=
π =4l/5=4×121/5=96.8cm
For a pipe open at one end and closed at the other also called closed pipe
Fundamental note is
2L/n= π where n=1,2,3....ie integers
First wavelength
π=2L=2×121=242cm
Second wavelength
π=L=121cm
Third is
π=2L/3=2×121/3=80.7cm