When a sound source is moving toward the observer, the observer will hear a higher pitch. This is due to
2 answers:
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Answer:
A) Em = 4.41 J
B) L = 0.33m
Explanation:
A) The total mechanical energy of the block is the elastic potential energy due to the compressed spring. The gravitational energy is zero. Then you have:
k: constant's spring = 730 N/m
Δx: distance of the compression = 0.11m
You replace the values of k and Δx:
B) To find the distance L traveled by the block you take into account that the total mechanical energy of the block is countered by the work done by the friction force, and also by the work done by the gravitational energy.
Then, you have:
μ: coefficient of kinetic friction = 0.19
g: gravitational acceleration = 9.8m/s^2
M: mass of the block = 2.5kg
θ: angle of the inclined plane = 21°
You replace the values of all parameters:
hence, the distance L in which the block stops is 0.33m
Answer:
97 minutes and 12 seconds
Explanation:
Let x be the total time
From the first statement
Total time of Dara's exercise is 14580 seconds
40 %
Time when she had completed 40% was 1 hour 37 minutes and 12 seconds