Leta stetter hollingworth conducted pioneering work on __________. a. identity development in ethnic minorities b. cognitive pro
1 answer:
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Answer:
Four; Two; One; Three
Explanation:
During a lab, a student tapes a ruler to a lab table and sets the ruler in motion. A laser detector pointed at the ruler records how many times the ruler vibrates back and forth in a period of time.
Pitch or frequency is defined as the number of cycles per unit time. We can calculate the pitch for each trials i.e.
Trial one,
Trial two,
Trial three,
Trial four,
Hence, the order of the trials from least to greatest pitch is :
Trial four, Trial two, Trial one and Trial three i.e. option (d) is correct.
Answer:
The force exerted is 6189.4 N
Solution:
As per the question:
Area of the book, A =
Mass of the book, m = 3 kg
Pressure of the book, P =
Now,
Pressure, P =
Force, F = PA =
Force on mass of 3 kg, F' = mg =
Now, the force at the bottom is given by:
F'' = F + F' = 6160 + 29.4 = 6189.4 N