Increasing
Explanation:
If a ship is moving forward and has a positive acceleration, we can say that the velocity of the ship is increasing.
Velocity is the rate of change of displacement of a body with time.
Acceleration is the rate of change of velocity with time.
Acceleration =
If a ship is moving with positive acceleration, the velocity of the ship is increasing also.
- This is because when velocity is increasing, the change will be positive.
- From the equation, to have positive velocity, the final velocity must be greater than the initial one.
- With this, acceleration will be positive.
- So we can say, velocity of the ship is increasing.
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Answer:
the earthquake's epicenter is L = 1091.2 km away
Explanation:
if the P and S waves start from the same place (x=0) :
P would travel the distance L in , L = vP * tP
P would travel the distance L in , L = vS * tS
therefore
vP * tP= vS * tS
if the difference in time d= tS-tP → tS=d+tP , then
vS * tS= vP * tP
vS *(d+tP) = vP * tP
vS*d + vS*tP = vP * tP
vS*d = vP * tP - vS*tP = (vP - vS) * tP
tP = vS*d / (vP - vS)
replacing values
tP = vS*d / (vS - vP) = 5.1 km/s * 1.5 min*60 s/min / ( 8.8 km/s - 5.1 Km/s) = 124 s
therefore
L = vP*tP = 8.8 km/s * 124 s = 1091.2 km
Metals can form a sea of elections which causes them to be good conductors of energy
c) To determine the velocity of the motion at the given time, consider that the velocity is also the area under the line of the graph a vs t.
Between t=0s and t = 2 s, the area under the line is:
A1 = 2 X 2 = 4
Then, until t = 2s the velocity is 4 m/s
The area between t = 2s and t = 4 s is:
A2 = 2 x 0 = 0
The area between t = 4s and t = 5s, the area is:
A3 = 2 x 1 = 2
Now, consider that the velocity is the sum of the previous areas, but taking areas on the negative y-axis as negative ones. Then, you have:
A = A1 + A2 - A3 = 4 + 0 - 2 = 2
Hence, the velocity is 2 m/s
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