Answer:
η = 0.667 = 66.7%
Explanation:
The efficiency of the man can be given by the following formula:
η = output/input
where,
η = efficiency of man = ?
output = potential energy gain of the box = Wh
input = work done by man = Fd
Therefore,
where,
W = weight of box = 200 N
h = height gained by box = 1 m
F = force exerted by man = 60 N
d = length of ramp = 5 m
Therefore,
<u>η = 0.667 = 66.7%</u>
Answer:
A. Atoms of the same element but ith different mass.
Explanation:
No the vector can never be shorter than one of its components
<h3><u>Answer;</u></h3>
3.53 cm
<h3><u>Explanation;</u></h3>
Mechanical advantage = Input distance/output distance
Input distance = 3.0 cm
Mechanical advantage = 0.85
Output distance = Input distance/Mechanical advantage
= 3.0/0.85
<u>= 3.53 cm</u>
Answer:
S = 108m
Explanation:
According to Second Law of Motion:
S = Vi*t + 0.5*a*t^2
Vi = 21m/s
a = 3m/s^2
t = 4s
Putting all values in Equation
S = 21*4 + 0.5*3*4^2
S = 84 + 24
S = 108m
