Answer:
a roller coaster at top.on hill
Time = (distance) / (speed)
Time = (150 x 10⁹ m) / (3 x 10⁸ m/s) =
50 x 10¹ sec =
<em>500 sec</em> = 8 min 20 sec
Answer:
194,22g/mol
Explanation:
8*12,01+10*1,01+4*14,01+2*16=194,22g/mol
Answer:
The value is ![u = 72.69 \ m/s](https://tex.z-dn.net/?f=u%20%3D%2072.69%20%5C%20%20m%2Fs)
Explanation:
From the question we are told that
The amount of force a square meter of an aircraft wing should produce is ![F = 1000 \ N](https://tex.z-dn.net/?f=F%20%3D%201000%20%5C%20%20N)
The air speed relative to the bottom of the wing is
The air level density of air is ![\rho_s = 1.29\ kg/m^3](https://tex.z-dn.net/?f=%5Crho_s%20%3D%20%201.29%5C%20%20kg%2Fm%5E3)
Gnerally this force per square meter of an aircraft wing is mathematically represented as
![F = \frac{1}{2} * \rho_s * A * [ u^2 - v^2 ]](https://tex.z-dn.net/?f=F%20%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20%2A%20%20%5Crho_s%20%2A%20%20A%20%20%2A%20%5B%20u%5E2%20-%20%20v%5E2%20%5D)
Here u is the speed air need to go over the top surface to create the ideal lift
A is the area of a square meter i.e ![A = 1 \ m^2](https://tex.z-dn.net/?f=A%20%3D%20%201%20%5C%20%20m%5E2)
So
![1000 = \frac{1}{2} * 1.29 * 1 * [ u^2 - 61.1 ^2 ]](https://tex.z-dn.net/?f=1000%20%20%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20%2A%201.29%20%20%2A%20%201%20%20%2A%20%5B%20u%5E2%20-%20%2061.1%20%5E2%20%5D)
=>
Answer:
B. twice as much kinetic energy
Explanation:
Lets take the mass of the first marble =2 m
the mass of the second marble = m
We know that velocity of particle does not depends on their mass that is the velocity of both mass will be same after dropping from the roof.
We know that kinetic energy of a mass is given as
![KE=\dfrac{1}{2}Mv^2](https://tex.z-dn.net/?f=KE%3D%5Cdfrac%7B1%7D%7B2%7DMv%5E2)
Kinetic energy for heavier mass
![KE=\dfrac{1}{2}\times 2m\times V^2](https://tex.z-dn.net/?f=KE%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%202m%5Ctimes%20V%5E2)
Kinetic energy for light mass
![KE'=\dfrac{1}{2}\times m\times V^2](https://tex.z-dn.net/?f=KE%27%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%20m%5Ctimes%20V%5E2)
KE=2 KE '
Form above two equation we can say that ,the kinetic energy for the heavier mass is twice the lighter mass.
Therefore the answer will be B.