Answer:
11.72 m/s
Explanation:
Energy is conserved when there are no energy loses. So potential energy and kinetic energy must be the same at the beginning and at the end.
Mechanical energy is the addition of both energy types, which is conserved.
So E= P+ K,
E: Mechanical energy
P: Potential Energy
K: kinetic energy.
P= m*g*h
K= (m*v^2)/2
M:mass
G:gravity=9.8m/s^2
H:altitude=7m
V: Velocity.
So P+K is conserved,
P1+K1=P2+K2
At the beginning there's no movement, so V=0, then K1=0
At the end there's no altitude, so H=0, then P2=0.
For those reasons,
P1=K2
M*G*H= M*v^2*0.5. As M is in both sides, we can take it out, and replace gravity and altitude with the values we already have.
9,81(m/s^2)* 7m = v^2 *0.5
68.67 (m/s)^2 = v^2 *0.5
(68.67 (m/s)^2 :0.5) ^ (1/2)= |v|
137.34^0.5=|v|
11.72 m/s= |v|
The sign will depend on where are we considering the 0 so will it be positive velocity if it's increasing direction or negative if it is decreasing
V = 20 m/s
Ecin = 1.8 x 10^5 J
Ecin = m*v^2/ 2
1.8*10^5 = m*400/2
200m = 1.8*10^5
I know you can do it :)
Using kinematic equation s=ut + 1/2 at^2(u = initial velocity=0, s=120m, t= 6.32s), 120 = 0(t) + 1/2 a(6.32)^2. a = 120x2/(6.32)^2 = 6m/s^2.
Answer:
The key point was that Kennedy challenged Nixon to a series of televised debates. It was the first televised presidential debate in American history.
In 1960, 88 % of American homes had television. About 2/3 of the electorate watched the first debate on TV. Nixon was recovering from a knee injury, he looked drained. Kennedy, meanwhile, had been resting in a hotel for an entire weekend, he looked tan and confident.
Most Americans watching the debates voted for Kennedy, most radio listeners seemed to give the edge to Nixon. hope this helps
Answer: 1
Explanation: The highest eccentricity an ellipse can have is '1', a straight line.