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BARSIC [14]
3 years ago
15

77. There is a 250-m-high cliff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks loose from the to

p of this cliff. (a) How fast will it be going when it strikes the ground? (b) Assuming a reaction time of 0.300 s, how long a time will a tourist at the bottom have to get out of the way after hearing the sound of the rock breaking loose (neglecting the height of the tourist, which would become negligible anyway if hit)? The speed of sound is 335.0 m/s on this day.
Physics
1 answer:
lisabon 2012 [21]3 years ago
8 0

Answer:70 m/s or 6.84 s

Explanation:

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A uniform electric field is directed parallel to the +y axis. If a positive test charge begins at the origin and moves upward al
lukranit [14]

Answer: option 1 : the electric potential will decrease with an increase in y

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V = kq/y

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From the formulae, we can see that q and k are constants, only potential (V) and distance (y) are variables.

We have that

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3 0
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Explanation:

8 0
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Please answer ASAP .
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Answer:

Explanation:

a = gsinθ

a = 9.8sin30

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8 0
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