Answer:

Explanation:
We can use the kinematics equation
to solve this problem. To find the initial vertical velocity, find the vertical component of the object's initial velocity using basic trigonometry for right triangles:

Now we can substitute values in our kinematics equation:
(acceleration due to gravity)
- Solving for

Answer:
None.
Explanation:
- By definition, work is a process that it happens when an applied force
causes an object to change its position, i.e. to have a displacement.
Since the laptop cart is at rest while he stops at the water fountain, no
net work done is on the laptop cart.
Answer:
the molrcular mass of carbon dioxide id 44.01amu
Explanation:
plz make me brainliest
Answer:
The value is 
Explanation:
From the question we are told that
The height of the water is 
The density of oil is 
The height of oil is 
Given that both arms of the tube are open then the pressure on both side is the same
So

=> Here

where
is the density of water with value 
and
is the atmospheric pressure
and

=> 
=> 
=> 
=> 
The difference in height is evaluated as


Answer:
Ķ rot = 2K rot
When the arms and weight are retracted toward the body, the energy increases by twice the initial kinetic energy because the moment of inertia has decreased coupled with the energy needed to bring the hands towards the body.
Explanation:
K rot = kinetic energy of system when hands + weight are stretched out = ½ Iw²
Where w = angular velocity when arms and weight are stretched out
I = inertia of the system = ( Ie + Ip) where Ie= moment of inertia of the extra weight carried and Ip = moment of inertia of the person.
Ķ rot = final rotational energy when arms and external weight are pulled in = ½Ìŵ² where Ì =( Ìe + Ìp)
And Ìe = inertia of weight when hands are retracted and Ìp = inertia of person when hand are retracted
Using conservation of angular momentum which is
Iw = Ìŵ
Substitute ŵ = (I/Ì)*W in Ķ rot to give
Ķ rot =½Ì *[ (I/Ì) * W ]²
Ķ rot = ½ ( I²/Ì) * w²
Since K rot = ½ I w²
So Ķ rot = K rot ( I/Ì )...eq3
From the question above system inertia reduces by a factor of 2
Ì = ½I
Sub expression into equ3
Ķ rot = 2K rot