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2 years ago

13

When a pendulum is at the midpoint of its oscillation, hanging straight down, which statement is true?

2 answers:

Svetach [21]2 years ago

5 0

When a pendulum is at the midpoint of its oscillation, hanging straight down ...

-- that's the fastest it's going to swing, so its kinetic energy is maximum;
and
-- that's the lowest it's going to get, so its potential energy is minimum.

'c' is your choice.

Misha Larkins [42]2 years ago

3 0

c. Kinetic energy is maximum and potential energy is minimum.

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A package is dropped from a helicopter that is descending steadily at a speed v0. After t seconds have elapsed, consider the fol

qaws [65]

Answer:

Part a)

$v = \sqrt{v_o^2 + g^2t^2}$

Part b)

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Part c)

$v_f = v_o - gt$

Part d)

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Explanation:

Part a)

As we know that speed of package is same as that of helicopter in horizontal direction

So after time "t" the velocity in x direction will remain constant while in Y direction it will go free fall

So we have

$v_y = -gt$

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Part b)

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so we will have

$d = \frac{1}{2}gt^2$

Part c)

If helicopter is rising upwards with uniform speed

then final speed of the package after time t is given as

$v_f = v_i + at$

$v_f = v_o - gt$

Part d)

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Answer:

Explanation:

a )

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efficiency = (800 / 2025) x 100

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