Answer:
The buoyant force is 3778.8 N in upward.
Explanation:
Given that,
Mass of balloon = 222 Kg
Volume = 328 m³
Density of air = 1.20 kg/m³
Density of helium = 0.179 kg/m³
We need to calculate the buoyant force acting
Using formula of buoyant force
![F_{b}=\rho_{air}\times V_{b}\times g](https://tex.z-dn.net/?f=F_%7Bb%7D%3D%5Crho_%7Bair%7D%5Ctimes%20V_%7Bb%7D%5Ctimes%20g)
Where,
= density of air
V = Volume of balloon
g = acceleration due to gravity
Put the value into the formula
![F_{b}=1.20\times321\times9.81](https://tex.z-dn.net/?f=F_%7Bb%7D%3D1.20%5Ctimes321%5Ctimes9.81)
![F_{b}=3778.8\ N](https://tex.z-dn.net/?f=F_%7Bb%7D%3D3778.8%5C%20N)
This buoyant force is in upward direction.
Hence, The buoyant force is 3778.8 N in upward.
Hi!
The energy of the block is 4 m/s
To calculate this, you need to use the equation for
kinetic energy. The block is sliding (i.e. it's moving). If the object is sliding across a level surface, the only energy it has is kinetic energy, because
there is no change in potential energy (which changes with height). So, the mechanical energy will be pure kinetic energy. The equation is the following, derived from the expression for kinetic energy:
![v= \sqrt{ \frac{2*Ke}{m}}=\sqrt{ \frac{2*20 (kg*m^{2}*s^{-2}) }{2,5kg}}=4 m/s](https://tex.z-dn.net/?f=v%3D%20%5Csqrt%7B%20%5Cfrac%7B2%2AKe%7D%7Bm%7D%7D%3D%5Csqrt%7B%20%5Cfrac%7B2%2A20%20%28kg%2Am%5E%7B2%7D%2As%5E%7B-2%7D%29%20%7D%7B2%2C5kg%7D%7D%3D4%20m%2Fs)
Have a nice day!
Answer:
4.29 millimeters
Explanation:
Bats emit ultrasound waves: in air, ultrasound waves travel at a speed of
![v=343 m/s](https://tex.z-dn.net/?f=v%3D343%20m%2Fs)
The frequency of the waves emitted by this bat is:
![f=80.0 kHz = 80,000 Hz](https://tex.z-dn.net/?f=f%3D80.0%20kHz%20%3D%2080%2C000%20Hz)
Therefore we can find the wavelength of the wave emitted by the bat by using the relationship between speed, frequency and wavelength:
![\lambda=\frac{v}{f}=\frac{343 m/s}{80,000 Hz}=4.29\cdot 10^{-3} m=4.29 mm](https://tex.z-dn.net/?f=%5Clambda%3D%5Cfrac%7Bv%7D%7Bf%7D%3D%5Cfrac%7B343%20m%2Fs%7D%7B80%2C000%20Hz%7D%3D4.29%5Ccdot%2010%5E%7B-3%7D%20m%3D4.29%20mm)
Answer:As sunlight passes through the atmosphere, all UVC and most UVB is absorbed by ozone, water vapour, oxygen and carbon dioxide. UVA is not filtered as significantly by the atmosphere. Is there a connection between ozone depletion and UV radiation? Ozone is a particularly effective absorber of UV radiation.
Explanation:
I had old notes
Answer:
Convergent.
Explanation:
Just as oceanic crust is formed at mid-ocean ridges, it is destroyed in subduction zones. Subduction is the important geologic process in which a tectonic plate made of dense lithospheric material melts or falls below a plate made of less-dense lithosphere at a convergent plate boundary.