Answer:
Its D Kr and Xe
Explanation:
Element from the same group have simmilar properties
If you now the atomic number ،its so easy to know how much electrons they have in outermost shell.
When a car hits you in a rear end collision, the car initially has a momentum going in one direction. This causes your car to move in the same direction that car was moving even if you were at rest. So, for conservation of momentum, you initially have momentum going in the east direction for example, after the collision, you will have a change in momentum which causes you to have a velocity in the west direction. This is because you are initially at rest and then there is a sudden change in velocity so when you speed up, that momentum causes you to move backwards. If you don't have a properly adjusted neckrest you could may experience whiplash.
assuming the reference line to measure the height for gravitational potential energy lying at the equilibrium position
m = mass attached to the spring = 10.00 kg
k = spring constant of the spring = 250 N/m
h = height of the mass above the reference line or equilibrium position = 0.50 m
x = compression of the spring = 0.50 m
v = speed of mass = 2.4 m/s
A = maximum amplitude of the oscillation
v' = speed of mass at the maximum amplitude location = 0 m/s
using conservation of energy between the point where the speed is 2.4 m/s and the highest point at which displacement is maximum from equilibrium
kinetic energy + spring potential energy + gravitational potential energy = kinetic energy at maximum amplitude + spring potential energy at maximum amplitude + gravitational potential energy at maximum amplitude
(0.5) m v² + m g h + (0.5) k x² = (0.5) m v'² + m g A + (0.5) k A²
inserting the values
(0.5) (10) (2.4)² + (10) (9.8) (0.50) + (0.5) (250) (0.50)² = (0.5) (10) (0)² + (10) (9.8) A + (0.5) (250) A²
109.05 = (98) A + (125) A²
A = 0.62 m
Answer:
![+1 m/s^2](https://tex.z-dn.net/?f=%2B1%20m%2Fs%5E2)
Explanation:
Acceleration is given by
![a=\frac{\Delta v}{\Delta t}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B%5CDelta%20v%7D%7B%5CDelta%20t%7D)
where
is the change in velocity
is the time interval in which the change in velocity occurs
To find the acceleration at 1 second, we can take the data at t = 1 s and t = 2. We find:
![\Delta t = -3 -(-4) = 1 s](https://tex.z-dn.net/?f=%5CDelta%20t%20%3D%20-3%20-%28-4%29%20%3D%201%20s)
![\Delta v = 2 - (1) = +1 m/s](https://tex.z-dn.net/?f=%5CDelta%20v%20%3D%202%20-%20%281%29%20%3D%20%2B1%20m%2Fs)
So, the acceleration is
![a=\frac{+1}{1}=+1 m/s^2](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B%2B1%7D%7B1%7D%3D%2B1%20m%2Fs%5E2)
Answer:
The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot. As the lever rotates around the fulcrum, points farther from this pivot move faster than points closer to the pivot.
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