For uniform acceleration (or deceleration in this case), you use the formula:
Vf = Vi + at
Vi = 22 m/s
Vf = 0 (coming to a stop)
t = 5 sec
Plugging everything into the formula gives you:
0 = 22 + 5a
-22 = 5a
a = -22/5 or -4.4 m/s^2
Hope this helps!
Answer:
3947.7 kg/m³
Explanation:
The relativistic density can be calculated using below expression;
ρ = ρ' /[√( 1 - v²/c²)]
where,
ρ = Change in Density as a result of motion
ρ'= Actual density of cube
ρ' is given as = 1800 kg/m³
v = Velocity that the cube moves = 0.89c
c = Speed of light
c= 3×10^8 m/s
ρ = ρ' /[√( 1 - v²/c²)]
if we substitute the given values we have
ρ= 1800/ √ 〈1- 0.89c²/ c²〉
ρ=3947.7 kg/m³
Hence, the cube's density is 3947.7 kg/m³
Answer:
![h = 269.6 m](https://tex.z-dn.net/?f=h%20%3D%20269.6%20m)
Explanation:
Pressure at the bottom of the building and at the top of the building must be related as
![P_{top} = P_{bottom} - \rho g h](https://tex.z-dn.net/?f=P_%7Btop%7D%20%3D%20P_%7Bbottom%7D%20-%20%5Crho%20g%20h)
![P_{top} = 730 mm Hg](https://tex.z-dn.net/?f=P_%7Btop%7D%20%3D%20730%20mm%20Hg)
![P_{bottom} = 755 mm Hg](https://tex.z-dn.net/?f=P_%7Bbottom%7D%20%3D%20755%20mm%20Hg)
now we will have
![(755 \times 10^{-3})(13.6 \times 10^3)(9.81) = P_{bottom}](https://tex.z-dn.net/?f=%28755%20%5Ctimes%2010%5E%7B-3%7D%29%2813.6%20%5Ctimes%2010%5E3%29%289.81%29%20%3D%20P_%7Bbottom%7D)
![P_{bottom} = 1.007 \times 10^5 Pa](https://tex.z-dn.net/?f=P_%7Bbottom%7D%20%3D%201.007%20%5Ctimes%2010%5E5%20Pa)
![P_{top} = (730\times 10^{-3})(13.6 \times 10^3)(9.81)](https://tex.z-dn.net/?f=P_%7Btop%7D%20%3D%20%28730%5Ctimes%2010%5E%7B-3%7D%29%2813.6%20%5Ctimes%2010%5E3%29%289.81%29)
![P_{top} = 0.974 \times 10^5](https://tex.z-dn.net/?f=P_%7Btop%7D%20%3D%200.974%20%5Ctimes%2010%5E5)
now we have
![(1.007 - 0.974)\times 10^5 = 1.25 (9.81) h](https://tex.z-dn.net/?f=%281.007%20-%200.974%29%5Ctimes%2010%5E5%20%3D%201.25%20%289.81%29%20h)
![h = 269.6 m](https://tex.z-dn.net/?f=h%20%3D%20269.6%20m)
Answer: 2.6 daL
Explanation: I just took the test
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They can be compounds too.
Examples: salt, sugar, and water are all compounds, not elements or mixtures.