Answer:
The forces that do non-zero work on the block are gravity and normal reaction force
Explanation:
In this question we have given,
mass of the wooden block,
angle between ramp and horizontal surface, 
in this case ramp is friction less so friction force will be zero and hence work done due to friction force will be zero.
As wooden block is sliding down due to gravity(gravity is pulling the block in downward direction).
so two forces will act on wooden block as it slides down the ramp that are gravity and normal reaction force.
Therefore, the forces that do non-zero work on the block are gravity and normal reaction force.
Answer:
Pascal's law
According to the Pascal's law ,pressure will be same in the all direction for a static and in-compressible fluid.In-compressible fluid means the density of the fluid is constant through out the volume.
Lets take cylinder 1 and cylinder 2
W= Applied load on the cylinder 1
We know that pressure = Load/Area
A₁=Cross sectional area of first cylinder
P₁=W/A₁
Given that fluid is In-compressible then pressure will be same and the same pressure will transfer to the second cylinder.
P₂=W₂/A₂=P₁
W₂=P₁ A₂
Given that
d₁=2.05 cm
d₂= 21.5 cm
W₂=P₁ A₂=A₂ W/A₁
W₂d₁²=W d₂²
W₂ x 21.5₁²=W x 2.05₂²
W₂=0.0090 W
Answer:
The answer is choice A and choice D
Explanation:
The answer below is just a joke, don't listen to them.
:)
Answer:
D) The given reaction is Exothermic, because energy is released
Explanation:
Here, given that Zinc is added to a beaker containing hydrochloric acid.
Also, the beaker gets warm.
⇒The energy is released in the form of heat.
EXOTHERMIC reactions are those type of reactions in which energy is released in the form of heat.
When the beaker gets warm, the reaction is exothermic in nature.
Hence, the given reaction is Exothermic, because energy is released
