The acceleration due to gravity on planet Alpha is B) 8.0 m/s2
Explanation:
The weight of a body is given by:
where
m is the mass of the body
g is the acceleration of gravity at the location of the body
In this problem, we have:
m = 70 kg is the mass of the astronaut
W = 560 N is the weight of the astronaut on the surface of planet Alpha
Therefore, we can re-arrange the equation to find g, the acceleration of gravity on the planet:
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Answer:
Answered
Explanation:
v= 1 m/s
A= 1 m^2
m= 100 kg
y= 1 mm
μ = ?
ζ= viscosity of SAE 20 crankcase oil of 15° C= 0.3075 N sec/m^2
forces acting on the block are
F_s ← ↓ →F_f
mg
N= mg
F_s= shear force = ζAv/y F_f= friction force = μN
now in x- direction F_s= F_f
ζAv/y = μN
0.3075×1×1×1/1×10^{-3} = μ×100
⇒μ=0.313 (coefficient of sliding friction for the block)
Now, as the velocity is increased shear force also increases and due to this frictional force also increases.
Now, to compensate this frictional force friction coefficient must increase
as v∝μ