Answer:
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The density is
Explanation:
The problem is asking to find the density of the object.
The density of an object is given by:
where
m is the mass of the object
V is its volume
For the object in this problem, we have:
m = 35 g (mass)
(volume)
Substituting , we find the density:
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Answer:
Both of them reach the lake at the same time.
Explanation:
We have equation of motion s = ut + 0.5at²
Vertical motion of James : -
Initial velocity, u = 0 m/s
Acceleration, a = g
Displacement, s = h
Substituting,
s = ut + 0.5 at²
h = 0 x t + 0.5 x g x t²
Vertical motion of John : -
Initial velocity, u = 0 m/s
Acceleration, a = g
Displacement, s = h
Substituting,
s = ut + 0.5 at²
h = 0 x t + 0.5 x g x t²
So both times are same.
Both of them reach the lake at the same time.
Answer: The elevator must be accelerating.
Explanation:
As the tension force is opposing to the the force of gravity on the load which is hung vertically, and the tension force can adopt any value in order to comply with Newton's 2nd law, if the tension force is less than the force due to gravity, this means that all system is not in equilibrium, so it must be accelerating.
If we assume that the downward is the positive direction, we can write:
mg - T = ma
If T = 0.9 mg, ⇒ mg (1-0.9) =0.1 mg = m a ⇒a = 0.1 g , in downward direction.
Given data:
The area of the hydraulic press is,
The applied force is,
The pressing force on the large piston is
Given hydraulic press works on Pascal's law principle.
From the Pascal's law, the equation can be given as,
Here,
is the area of the larger piston.
Substituting the values in the above equation, we get:
Thus, the area of the large piston is