<span>What role did gravity play in the formation of the planets?
A.
Gravitational forces brought together several moon-sized bodies, called
planetesimals, to form larger bodies that became planets.</span>
Answer:
The speed with which just after he grabs her is 2.68 m/s.
Explanation:
Given that,
Mass of Erica, m = 38 m/s
Mass of Danny, m' = 46 kg
Erica reaches the high point of her bounce, Danny is moving upward past her at 4.9 m/s. At this moment, the initial speed of Erica will be 0. The momentum will remain conserved. Using the conservation of linear momentum as :

So, the speed with which just after he grabs her is 2.68 m/s. Hence, this is the required solution.
Answer:
a)
, b)
, c)
, 
Explanation:
a) The angular motion is obtained by integrating the angular acceleration function twice:



The angular motion when t = 2 s. is:


b) Let be
the distance between A and the rotation axis, measured in meters. The magnitude of the angular velocity when t = 2 s. is:


Finally, the magnitude of the velocity is:

c) The angular acceleration of the disk when t = 2 s. is:


Lastly, the normal and tangential components at point A are, respectively:





Answer:
Explanation: RADIUS OF EARTH = 6400X1000m =
ACC DUE GRAVITY ABOVE SURFACE OF EARTH = g' =2.45 m/s^2
ACC DUE GRAVITY ON SURFACE OF EARTH =g= 9.8 m/s^2
A/C TO FORmULA
g'/g=1-2h/Re
g'/g +2h/Re = 1
2h/Re =1- g'/g
2h= (1- g'/g)Re
2h=(1-2.45 /9.8)
6400X1000
2h = (0.75)6400X1000
2h = 4800000
h= 2400000
m