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sveta [45]
3 years ago
10

You and your friends find a rope that hangs down 19m from a high tree branch right at the edge of a river. You find that you can

run, grab the rope, swing out over the river, and drop into the water. You run at 2.0 m/s and grab the rope, launching yourself out over the river.How long must you hang on if you want to drop into the water at the greatest possible distance from the edge?
Physics
1 answer:
tangare [24]3 years ago
5 0

Answer:

Explanation:

Given

length of rope L=19\ m

velocity while running v=2\ m/s

when the person jumps off the bank and hang on the rope then we can treat the person as pendulum with Time period T which is given by

T=2\pi \sqrt{\frac{L}{g}}

T=2\pi \sqrt{\frac{19}{9.8}}

T=2\pi \times 1.392

T=8.74\ m/s

Greatest Possible distance will be covered when person reaches the other extreme end  of assumed pendulum (velocity=zero)

therefore he must hang on for 0.5 T time

time=0.5\times 8.74=4.37\ s

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Answer:

Explanation:

Given

Minute hand length =16 cm

Time at a quarter after the hour to half past i.e. 1 hr 45 min

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Angle =270^{\circ}

(c)For the next half hour

Effectively it has covered 2 revolution and a quarter

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angle turned =90^{\circ}

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Angle turned will also be same i.e. 90 ^{\circ}

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3 years ago
In film photography, shutter speed is the length of time that the film is exposed to the scene you’re photographing. Similarly,
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Answer:

a. 1/1000 sec

Explanation:

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Thus, the fastest one is option A.

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g A 45.0 - kg girl is standing on a 150. - kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is
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Answer:

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