Explanation:
rent me for brainliest pls
Less than. A machine should have equal or more output than input to have a high efficiency. :)
Answer:
83,900 J
Explanation:
First, find the acceleration:
F = ma
1150 N = (1600 kg) a
a = 0.719 m/s²
Now find the final velocity.
Given:
Δx = 45.8 m
v₀ = 6.25 m/s
a = 0.719 m/s²
Find: v
v² = v₀² + 2aΔx
v² = (6.25 m/s)² + 2 (0.719 m/s²) (45.8 m)
v = 10.2 m/s
Now find the final KE:
KE = ½ mv²
KE = ½ (1600 kg) (10.2 m/s)²
KE = 83,920 J
Rounded to three significant figures, the final kinetic energy is 83,900 J.
Answer:
Negative work done of 30729.6 Joules
Explanation:
Since work done is dot product of force and displacement. so,
W= F.d
W= F d cosΘ
where Θ is the angle between force and displacement. Since resistive force and displacement makes an angle of 180 (as one is pointed east and other west). So,
W = (7.92)(1940)(cos (180)) (distance should be in meter)
W = 15364.8(-1)
W = -15364.8 (for going east)
Total work done will be twice of that as the resistive force and distance are same for the way back.
W = -15364.8 + (-15364.8)
W = -30729.6 Joules
