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vredina [299]
4 years ago
13

A 55 kg person moves at the constant speed of 7 m/s along a straight stretch of track for 20s. How far does he travel in this ti

me ?
Physics
1 answer:
crimeas [40]4 years ago
6 0
By definition,
Distance = Speed * Time

Therefore the distance traveled is
(7 m/s)*(20 s) = 140 m

Answer: 140 m
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3 years ago
What is the amount of mass in a given volume called?
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allochka39001 [22]
B is the correct answer
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3 years ago
Your tutor tells you that an ampere (A) and a volt (V) measure the same thing and that the different terms just make a simple co
saw5 [17]

Answer:

Explained

Explanation:

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3 years ago
A simple harmonic oscillator of amplitude A has a total energy E.
jeka57 [31]

Answer:

a) K=E-\frac{kA^2}{18}

b) U=\frac{kA^2}{18}

Explanation:

The law of conservation of mechanical energy states that total mechanical energy remains constant during oscillation. Mechanical energy is defined as the sum of kinetic energy and potential energy:

E=U+K\\E=\frac{kx^2}{2}+\frac{mv^2}{2}

a) The position is one-third the amplitude. So, we have x=\frac{1}{3}A. Replacing and solving for K

E=\frac{k(\frac{1}{3}A)^2}{2}+K\\E=\frac{kA^2}{18}+K\\K=E-\frac{kA^2}{18}

b) The potential energy is defined as:

U=\frac{kx^2}{2}

Replacing:

U=\frac{k(\frac{1}{3}A)^2}{2}\\U=\frac{kA^2}{18}

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3 years ago
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