1. solve for y-dir
sy = v0yt - 0.5gt^2 where g = 9.81 m/s^2
14 = v0yt - 4.905t^2
vy = v0y - gt where vy = 0 at the top of height
0 = v0y - 9.81t
2 eqns, 2 unkns
i. 14 = v0yt - 4.905t^2
ii. 0 = v0y - 9.81t
solved
v0y = 1.689 m/s
t = 16.573 s
2. solve for x-dir
sx = 0.5t×(vx + v0x)
where vx = 0 m/s b/c it lands in the end
where t = 16.573×2 = 33.146 s b/c 16.573 seconds was until ball reached height, hence it must take twice as long to reach the ground
21 = 0.5×33.146*(0 + v0x)
v0x = 1.267 m/s
Now combine x & y components
v0 = sqrt(v0x^2 + v0y^2)
m/s
hence v0 = 2.112 m/s
Answer:
122.5m
Explanation:
Basic kinematics, negating drag and assuming ideal conditions, we use the equation:
d=vi*t+1/2*a*t^2
Since vi is 0 (we know this because you’re dropping it, not throwing it)…
…and the only acceleration acting on it is gravity, a=9.8 m/s^2…
…we get
d=1/2(9.8)(5)^2
Some quick mental math tells us that this is about 125 m.
Plugging it in, we find it to be 122.5 m.
As the distance from the Sun increases the time to orbit the Sun increases. <em>(a)</em>
Examples:
-- Nearest planet to the sun: Mercury. Time to orbit the sun: 88 days
-- 3rd planet from the sun: Earth. Time to orbit the sun: 1 year
-- 5th planet from the sun: Jupiter. Time to orbit the sun: 12 years
-- 9th closest object to the sun: Pluto. Time to orbit the sun: 248 years
Another pair of examples:
-- Object in a near Earth orbit: International Space Station
Time to orbit the Earth: 90 minutes
-- Object in a far Earth orbit: the Moon
Time to orbit the Earth: 27.3 days
The reason for all of this is: Two things about orbits.
1). The larger the orbit is, the farther the object has to travel around it.
2). The farther out the object is, the slower it travels in its orbit.
This is simply the way gravity works.
Answer:
226.2 m/sec
Explanation:
We have given
The plank's constant
Mass of electron
Now according to Heisenberg uncertainty principle
So
Answer:
7 Electrons
Explanation:
Assuming that final energy level is that same as valence shell, we first need to find how many of the electrics will be used to fill the ones before it.
Electron shell capacities are as follows :
First shell/Ebergy level: 2 electrons
Seconds shell/energy level : 8 electrons
Third shell /energy level :8 electrons
The first two shells total to 10, and the first three shells total to 18. Since chlorine (17) fills more than 2 shells but less that 3, the third one is its final energy level. We find the number in the final energy level by subtracting the 10 in the full first two. 2+8=10
17-10=7
Chlorine has 7 electrons on its final energy level.
Hope this helped!