A packing crate is sitting at rest on an inclined loading ramp. How does the magnitude of the force of static friction compare t
1 answer:
As a crate is resting on the inclined surface of the ramp we have following forces on the crate
1. Weight of the crate vertically downwards
2. Normal force due to ramp perpendicular to the surface
3. static friction force along the ramp upwards
so here we know that crate is at rest
so we can say that
normal force is balanced by component of weight of crate
so we have
also we can say that friction force is balanced by another component of weight of the crate
so friction force is less than the weight of the crate and it will act opposite to it
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Answer:
The rate of change of the distance is 14.89.
Explanation:
Given that,
Distance = 145 miles
Speed of car = 42 miles/hr
Distance covered by car = 55 miles
We need to calculate the the rate of change of the distance
According to figure,
Let OA is x, and AB is y.
Now, using Pythagorean theorem
On differentiating
Hence, The rate of change of the distance is 14.89.
Answer:
The inventors claim is not real
a) No the the freezer cannot operate in such conditions
Explanation:
From the question we are told that
The power input is
The rate of heat transfer
The temperature of the freezer content is
The ambient temperature is
Generally the coefficient of performance of a refrigerator at idea conditions is mathematically represented as
substituting values
Generally the coefficient of performance of a refrigerator at real conditions is mathematically represented as
substituting values
Now given that the COP of an ideal refrigerator is less that that of a real refrigerator then the claims of the inventor is rejected
This is because the there are loss in the real refrigerator cycle that are suppose to reduce the COP compared to an ideal refrigerator cycle where there no loss that will reduce the COP