Answer:
a= - 1.2 m/s²
Direction of a : in the negative x- direction
Explanation:
Because the ball moves with uniformly accelerated movement we apply the following formula:
vf²=v₀²+2*a*d Formula (1)
Where:
d:displacement in meters (m)
v₀: initial velocity in m/s
vf: final velocity in m/s
a: acceleration in m/s²
Known data
v₀ = 9.0 m/s
vf= 3.00 m/s
d = 30.0 m.
Problem development
We replace data in the formula (1) to calculate acceleration :
vf²=v₀²+2*a*d
(3)²= (9)² + (2* 30)*a
9=81+(60)*a
9-81=(60)*a
-72= (60)*a
a= -72/60
a= - 1.2 m/s²
Direction of a : in the negative x- direction
Use force (thrust) equals mass times acceleration.
Answer:
the paper ball falls faster and the unfolded paper falls at a slower rate
Explanation:
this is because gravity is pulling both objects down to the ground and hence they are falling. Both objects have the same mass and weight but the resultant force of the paper ball is smaller than that of the unfolded paper. The unfolded paper has a larger surface area and so a larger force is acted upon it, meaning there is more air resistance. This shows that the paper ball falls faster than the unfolded paper.
Answer:
An electrically polarized object can carry no net charge
Example: charge Q at +x and charge -Q at -x for no net charge
An electrically charged object has a net charge on the object
Answer:
A. The electric field lines point outward and the black puck moves backwards. From this I can see that I can't put the red charge in front of the black puck because it will go away from the goal.
B. The electric field lines point inward and the black puck moves forwards and backwards. The conclusion I made from this was the blue charge by itself will not be able to get into the goal.
C.The puck moves faster when the mass increases and moves slower when the mass decreases. The more mass, the more force that is applied to the puck.
D. The relationship between the speed of the black puck and its distance from the blue charge is when the puck is further away from the blue charge, the slower the puck moves away from it.
Explanation: