It would be "Researchers found environmental safe replacements for CFC's"
Answer:
A) Periodic time
Explanation:
Wavelength is the distance from a point on a wave to the same point on an adjacent wave
Wave speed is the speed the wave is travelling at
Wave frequency is how many waves pass a fixed point in a given time period
Answer:
0.615 m
Explanation:
We need to determine the force on the spring first. By Newton's second law of motion, force is the product of the mass and acceleration. The mass is given.
The acceleration is determined using the equation of motion.
Given parameters:
Initial velocity, <em>u</em> = 0.00 m/s
Distance, <em>s</em> = 4.19 m
Time, <em>t</em> = 0.601 s
We use the equation

With <em>u</em> = 0.00 m/s,



The force is

From Hooke's law, the extension, <em>e</em>, of a string is given by

where <em>k</em> is the spring constant.
Hence,
