Answer:
yes smoke is chemically combined because smoke is a collection of airborne solid and liquid particles and gases released when a material burn.
hope it is helpful to you
11.31g/cm3
Explanation:
since density= mass/volume
mass=13
volume of a sphere=4/3πr3
=4/3*3.14*(0.65)^3
=1.149
therefore it becomes,13/1.149
=11.31g/cm
Answer:
speed of plane in still air = 252 mph
speed of wind = 42 mph.
Explanation:
Given:
Distance travelled by the small plane = 245
Time taken to fly 245 miles = 1 hour and 10 minutes.
Time taken for return trip = 50 minutes.
To Find:
speed of the wind=?
The speed of the plane in still air=?
Solution:
We Know that
=>
=>
=>
=>210 mph against wind
on way back
=>
=>
=>
=> 294
Now
294 = plane +wind------------------------(1)
210 =plane - wind-------------------------(2)
Solving (1) and (2)
2 plane = 504
plane = 252
plane = 
So substituting plane value in eq(2) we get,
210 =252 - wind
wind = 42 mph