How does the tension in your arms compare when you let yourself dangle motionless by both arms and by one arm
1 answer:
When you support yourself with two arms, the tension in each arm is half of the tension you experience when you support your weight with only one arm.
The tension in your arm is directly proportional to the weight of your body.
T = W = mg
When you support your weight with your two arms;
- the upward force balancing the downward force due to the weight of your body will be distributed equally in both arms.
When you support the weight of your body with one arm,
- the upward force balancing the downward force due to your weight will be on only one arm
Thus, when you support yourself with two arms, the tension in each arm is half of the tension you experience when you support your weight with only one arm.
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Complete Question
One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. Having recently studied optics in your physics class, you're not too surprised to see that the patch of light seems to be a circular diffraction pattern. It appears that the central maximum is about 2 cm across, and you estimate that the distance from the window shade to the wall is about 5 m.
Required:
Estimate the diameter of the pinhole.
Answer:
The diameter is
Explanation:
From the question we are told that
The central maxima is
The distance from the window shade is
The average wavelength of the sun is mathematically evaluated as
Generally the visible light spectrum has a wavelength range between 400 nm to 700 nm
So the initial wavelength of the sun is
and the final wavelength is
Substituting this into the above equation
The diameter is evaluated as
substituting values