Answer:
Explanation:
Given
Mass = m
Time = t
Force = mass × acceleration ..... 1
Where acceleration = velocity/time
Ave Force = m×∆v/∆t
= mv/t
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Sin is the vertical component. So multiply sin 30 and 14. BOOM! You got the answer.
Answer:
a) 269.23 N
b) Fr = 70.77 N
c) Work output = 5250 J
d) Work Input = 6630 J
e) Mechanical Advantage
- ideal mechanical advantage = 3.9
- Actual Mechanical Advantage = 3.09
Explanation:
a) In an ideal machine, all the work input is converted to work output.
Work output = F₀ × d₀ = 1050 × 5 = 5250 J
Work input = Fᵢ × dᵢ = 19.5 Fᵢ
19.5 Fᵢ = 5250
Fᵢ = 269.23 N
b) Real effort = 340 N
Since 269.23 N is the force required to lift the 1050 N load in this pulley system, the rest of the 340 N force services frictional forces.
Frictional force = 340 - 269.23 = 70.77 N
c) Output work = Work done by the load = F₀ × d₀ = 1050 × 5 = 5250 J
d) Input Work = Work done by the Effort = Fᵢ × dᵢ = 340 × 19.5 = 6630 J
e) Ideal Mechanical advantage = distance travelled by effort/distance travelled by load
ideal mechanical advantage = 19.5/5 = 3.9
Actual Mechanical Advantage = Load/Effort = 1050/340 = 3.09
Efficiency = Work output/Work input = 5250/6630 = 0.792
Answer:
0.095 hours = 5.7 mins
Explanation:
from the questions we are given the following:
distance (s) = 4.7 km/h
maximum speed of boat with respect to the water (S) = 12.7 km/h
speed of flowing water = 4.7 km/h
minimum crossing time =?
the minimum crossing time can be gotten from the formula
time =
in this question we would not be considering the speed of the flowing water because we were told to find the minimum time to cross with a boat moving at a maximum speed with respect to the flowing water
time =
= 0.095 hours = 5.7 mins