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Sagot :
Answer:
3600N
Explanation:
Given: m = 1200kg, Vo = 0m/s, Vf = 30m/s, Δt = 10s
ΣF = ma
we need to find 'a' first, using the definition of 'a' we get equation:
a = (Vf-Vo)/Δt
a = (30m/s)/10s
a = 3 m/s^2
now substitute into top equation
ΣF = ma
Fengine = (1200kg)(3m/s^2)
Fengine = 3600N
Answer:
P = 54000 W or P = 54 kW
Explanation:
P = Work/time
W = Force * distance
first, find acceleration to find net force using kinematics.
v = vo + at
30 = 0 + a(10)
a = 3 m/s^2
Fnet = ma = 1200(3) = 3600N = Force
Next, find the distance traveled using kinematics.
∆x = vo(t) + 1/2at^2
∆x = 0(10) + 1/2(3)10^2
∆x = 150 m
Now use the force and distance you just calculated to find the work done.
W = Force*distance
W = 3600N * 150m
W = 540000
Calculate power.
P = W/t
P = 540000/10
P = 54000 W
or
P = 54 kW
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