Answer:
Distance will be 348.55 m
Explanation:
We have given speed of sound in air = 343 m /sec
And speed of sound in concrete = 3000 m/sec
Let time is t sec
It is given that 0.90 sec apart
As we know that distance will be same
And distance = speed × time
So 3000×t = 343 × (t+0.9)
![3000t=343t+308.7](https://tex.z-dn.net/?f=3000t%3D343t%2B308.7)
t = 0.116 sec
So distance will be d = 3000 t = 3000×0.116 = 348.55 m
Answer:
The dependant variable is obvrioulsy going to be the temperature of the watch, and the independan variable is going to be the amount of water ebing poured into the cups.
Explanation:
The temperature is the dependant variable by how it is the thing being observed, or recorded. Your independant variables could be a few things from wha information I have but it could be either, the amount of water being poured into the cups, the temperature of the water being poured, or the amount of time between each new temperature of wather bing poured into the cups.
Radio waves - used for communication e.g. radios and TVs
Microwaves - used for cooking food and for satellite communications
Infrared light - used by electrical heaters and infrared cameras
Ultraviolet radiation - kills bacteria - sterilises water and makes it safe to drink and produces vitamin D - good for skin
Inertia is the correct answer!
A. 90km/h = 25 m/s
W=1/2mv^2
=1/2* 650* 25^2
= 203125(J)
b. v’= 90-50= 40km/h
= 100/9 m/s
W=1/2mv^2
=1/2*650*(100/9)^2
= 40123,45679