Which of the following ocean motions are powered by the wind? waves tides surface currents deep ocean currents
2 answers:
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Answer:
Net pull = 110 N to the left
Explanation:
Group the different pulls according to the direction (right or left)
2 pull 196 N each to the right
4 pull 98 N each to the left
5 pull 62 N each to the left
3 pull 150 N each to the right
1 pull 250 N to the left
Since positive direction is to the right, the pulls to the left will have a minus (-)
The resulting force is negative, meaning the direction is to the left
(a)
<u>Explanation:</u>
Given:
Moment of Inertia of m₁ about the axis, I₁ = m₁x²
Moment of Inertia of m₂ about the axis. I₂ = m₂ (L - x)²
Kinetic energy is rotational.
Total kinetic energy is
Work done is change in kinetic energy.
To minimize E, differentiate wrt x and equate to zero.
Alternatively, work done is minimum when the axis passes through the center of mass.
Center of mass is at
Answer:
25.5 m/s
Explanation:
The Doppler effect occurs when there is relative motion between a source of a wave and an observer. In such situation, there is a shift in the apparent frequency of the wave perceived by the observer.
The formula that gives the apparent frequency perceived by the observer is:
where
f is the real frequency of the wave
f' is the apparent frequency of the wave
v is the speed of the wave
is the velocity of the source (negative if the source is moving towards the observer, positive otherwise)
is the velocity of the observer (positive if the observer is moving towards the source, negative otherwise)
In this problem:
v = 340 m/s is the speed of sound
f = 800 Hz is the frequency of the horn
f' = 860 Hz is the apparent frequency
(the observer is at rest)
Re-arranging the equation for , we can find the velocity of the horn and the driver:
So, 25.5 m/s towards the observer.