10.0 force to get 2000j to move a box in 8s.
Answer:
a) 4 s
b) 36 m/s²
c) 54 m
Explanation:
s = 2t³ – 24t + 6
a) Find t when v = 72 m/s.
v = ds/dt
v = 6t² – 24
72 = 6t² – 24
6t² = 96
t = 4
b) Find a when v = 30 m/s.
a = dv/dt
a = 12t
When v = 30:
30 = 6t² – 24
6t² = 54
t = 3
a = 36
c) Find Δs between t = 1 and t = 4
Δs = (2(4)³ – 24(4) + 6) – (2(1)³ – 24(1) + 6)
Δs = 38 – (-16)
Δs = 54
#1
The x axis of the trajectory will show the displacement in X direction only
So it is the Horizontal range
Correct answer would be
<em>Displacement in the horizontal direction(my guess)</em>
2
The stone is projected horizontally at height 64.8 m
now we can use kinematics in Y direction
now we have
<em>so here it will fall in the air for time t = 3.64 s</em>
A - the hot liquid metal in the outer core of Earth creates electric currents