Answer: 0.1416 kg
Explanation:
Total Mass = Mass of beach ball + Mass of air inside
Mass of beach ball = 0.100 kg
Mass of air = density * volume
Density = 1.30 kg/m^3
Radius (r) = 21.6 cm = 0.216 m
Volume (sphere) = π * r^3 = π * (0.216)^3 = 0.032 m^3
Hence:
Mass of air = 1.30 * 0.032 = 0.0416 kg
Total Mass = 0.100 + 0.0416 = 0.1416 kg
The United States has a more significant economy than most countries around the world.
To solve this question, we use the wave equation which is:
C=f*λ
where:
C is the speed;
f is the frequency;
λ is the wavelength
So in this case, plugging in our values in the problem. This will give us:
C = 261.6Hz × 1.31m
= 342.696 m/s is the answer.
Answer:
4.5sec
Explanation:
From the question above, the following are the parameters that are given
u= 30m/s
v= 50m/s
s= 180m
First of all we have to find the acceleration by using the third equation of motion
V^2= U^2 + 2as
50^2= 30^2 + 2(a)(180)
2500= 900 + 360a
Collect the like terms
2500-900= 360a
1600=360a
Divide both sides by the coefficient of a which is 360
1600/360=360a/360
a= 4.44m/s
The next step is to find the time. To do this we will have to use the first equation of motion
v= u + at
50= 30 + 4.44t
Collect the like terms
50-30= 4.44t
20= 4.44t
Divide both sides by the coefficient of t which is 4.44
20/4.44= 4.44t/4.44
t= 4.5sec
Hence 4.5secs elapses while the auto moves at a distance of 180m
