A tired physics professor can easily read the fine print of the financial page when the newspaper is held at arm's length, 61.5
1 answer:
Answer:
45.04 cm
Explanation:
The tired physics professor red easily at a distance of 26 cm
So v = 26 cm
And it is given that object distance that is u = 61.5 cm
There is relation between focal length object distance and image distance that is
Here f =focal distance v = image distance and u = object distance
So
So f=45.04 cm
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Answer:
v = 5.34[m/s]
Explanation:
In order to solve this problem, we must use the theorem of work and energy conservation. This theorem tells us that the sum of the mechanical energy in the initial state plus the work on or performed by a body must be equal to the mechanical energy in the final state.
Mechanical energy is defined as the sum of energies, kinetic, potential, and elastic.
E₁ = mechanical energy at initial state [J]
In the initial state, we only have kinetic energy, potential energy is not had since the reference point is taken below 1.5[m], and the reference point is taken as potential energy equal to zero.
In the final state, you have kinetic energy and potential since the car has climbed 1.5[m] of the hill. Elastic energy is not available since there are no springs.
E₂ = mechanical energy at final state [J]
Now we can use the first statement to get the first equation:
where:
W₁₋₂ = work from the state 1 to 2.
where:
h = elevation = 1.5 [m]
g = gravity acceleration = 9.81 [m/s²]