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3 years ago

Some earthquake waves, a cat’s purr, and elephant communications consist of ultrasonic waves.

Physics

2 answers:

Kobotan [32]3 years ago

7 0

The answer to your question is true.

slavikrds [6]3 years ago

3 0

True because when a can purrs thats basically saying the cat is happy and cats, elaphants among other animals can sence eartquakes from miles away

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Answer:

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Explanation:

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2 years ago

Does a sled have inertia while sitting still

madam [21]

Answer:

Yes, a sled has inertia while sitting still.

Explanation:

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4 years ago

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3 years ago

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slega [8]

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3 years ago

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At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 2.5 m/s2. At the same insta

Licemer1 [7]

Answer:

6.96 s

Explanation:

<u>Given:</u>

u = initial speed of the automobile = 0 m/s

a = constant acceleration of the automobile = $2.5\ m/s^2$
v = constant speed of the truck = 8.7 m/s

<u>Assume:</u>

t = time instant at which the automobile overtakes the truck.

At the moment the automobile and the truck both meat each other the distance travel by both vehicles must be the same.

$\therefore \textrm{Distance traveled by the automobile }=\textrm{Distance traveled by the truck}\\\Rightarrow ut+\dfrac{1}{2}at^2=vt\\\Rightarrow (0)t+\dfrac{1}{2}\times 2.5\times t^2=8.7t\\\Rightarrow 1.25t^2=8.7t\\\Rightarrow 1.25t^2-8.7t=0\\\Rightarrow t(1.25t-8.7)=0\\\Rightarrow t = 0\,\,\,or\,\,\, t = \dfrac{8.7}{1.25}\\\Rightarrow t = 0\,\,\,or\,\,\, t = 6.96\\$

Since t = 0 s is the initial condition. So, they both meet again at t = 6.96 s such that the automobile overtakes the truck.

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3 years ago