Answer:
The velocity = 5.82[m/s], Tension = 1.78 [N]
Explanation:
We can solve this problem using the principle of energy conservation and Newton's second law.
Here we can find an attached image of the pendulum with a free body diagram, where we can see the forces acting over the pendulum.
The initial data are:
The pendulum is released when the string is at 90° with respect to the vertical axis. Therefore the initial velocity is zero = 0, and the initial kinetic energy will be zero also.
The expression that defines the kinetic energy and the work is the following equation.
We take the reference point where the pendulum is matching the vertical axis. At this point the potential energy is zero and all the potential energy has been transformed into kinetic energy.
Now analyzing once again the expression deducted, we have:
In the free body diagram, we can see the forces and the equation to find the tension T. Especial attention must be seen to notice that the acceleration to find the tension in the equation should be the normal acceleration.
The normal acceleration is defined by:
Clearing the tension T, this value is 1.78 [N]
The characteristics of stars that can be determined by analyzing a star's spectrum - Doppler shift, temperature, size, composition, and rotation.
1- Rotation: The star's rotation creates a broadening of the spectral lines, which can be used to determine the star's rotation.
2- Temperature: Measure the relative strengths of spectral lines to determine a star's spectral class which corresponds to temperature.
3- Doppler shift: The Doppler shift of the star is determined by its radial velocity.
4- Size: Measure the width of spectral lines. If the lines are narrow, the star's diameter is large. If the lines are wider, the star's diameter is smaller.
5- Composition: Computer models and temperature are used to determine elemental abundances from relative strengths of absorption lines in a star's spectrum.
Learn more about spectrum on:
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Answer:
B
Explanation:
In this calorimetry problem, the heat released by the reaction is equal to the heat absorbed by the solution (assumed to have the same specific heat capacity as water, 4.19 Jg⁻¹°C⁻¹).
The formula Q = mcΔt will be used to calculate the heat energy, where m is the mass, c is the specific heat capacity, and Δt is the change in temperature from final to initial.
The volume of solution is (50.0 + 50.0)mL = 100.0mL = 100.0g, since water has a density of 1.00g/mL.
The heat absorbed by the solution is then calculated.
Q = mcΔt = (100.0 g)(4.19 Jg⁻¹°C⁻¹)(28.2°C - 25.0°C) = 1340 J
The closest answer is B) 1300 J. This answer is obtained by including only two significant figures in the answer.
D because if you are heavier and standing higher up then you will have greater potential energy than someone who weighs less and is standing at a lower height.
Answer:
are nearby and bright i hope this helps