Total mechanical energy: D) 2800 J
Explanation:
The total mechanical energy of an object is given by
where:
is the kinetic energy of the object, which is the energy possessed by the object due to its motion, where
m = mass of the object
v = speed
And
is the gravitational potential energy of the object, the energy possessed by the object due to its location, where
is the acceleration due to gravity
h is the height of the object above the ground
For the body in this problem, we have:
m = 4.0 kg
v = 20 m/s
h = 50 m
Substituting, we find its total energy:
Learn more about kinetic and potential energy:
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Answer:
Velocity includes direction.
Explanation:
Velocity is a vector. It includes both direction and magnitude.
Speed is the magnitude of velocity.
Answer:
200 cm cube
Explanation:
The formula for volume is length * breadth * height so we get 200 cm cube as answer.
Answer:
<em>500Hertz</em>
Explanation:
Given the fundamental frequency of the string given as 1.25x10²Hz
Harmonics are integral multiples of the fundamental frequency.
In strings, the third harmonic F3 is expressed in terms of the fundamental frequency expressed as;
F3 = 4F0
F0 is the fundamental frequency;
Given
F0 = 1.25x10²Hz
F3 = 4(1.25x10²)
F3 = 4(125)
F3 = 500Hz
<em>Hence the frequency of the third harmonic is 500Hertz</em>
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#8 positive kinetic energy