The answer is 54.675 J
<span>The kinetic energy (Ke) of an object is the product of half of its mass (m) and the square of its velocity (v²):
</span>Ke = 1/2 m * v²
We have:
Ke = ?
m = 15 kg
v = 2.7 m/s
_____
Ke = 1/2 * 15 kg * (2.7 m/s)² = 1/2 * 15 kg * 7.29 m²/s² = 54.675 kg * m²/s²
Ke = 54.675 J
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Answer:
306.12N/m^2
Explanation:
Mass = 30 kg
g = 9.8m/s2
F = mg
F = 30 x 9.8
F = 294N
L = 0.98m
Since the stilts is square, then the area is L^2
A = L^2
A = 0.98^2
A = 0.9604m^2
P =?
P = F/A
P = 294/0.9604
P = 306.12N/m^2
The pressure exerted by the man is 306.12N/m^2
Answer:
M.A = load/ effort
1200N/400N
= 3
velocity ratio= radius of wheel/radius of Axle
40cm/10cm
=4
efficiency= 3/4*100
75%