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3 years ago

6

A child drops a ball from a window.The ball strikes the ground in 3.0 seconds.What is the velocity of the ball the instant befor

e it hits the ground?

1 answer:

lord [1]3 years ago

4 0

It might be 4.0 or 2.22344 seconds as velocity speed

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Convert 75°C into (A) kelvin (B) °F

sukhopar [10]

Answer:

348.15K

Explanation:

75C+273.15=348.15K

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2 years ago

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3 years ago

2. Below what depth would a submarine have to submerge so that it would not be swayed by surface waves with a wavelength of 24 m

Travka [436]

<u>Answer:</u> Below 12m of depth, the submarine has to submerge so that it would not be swayed by surface waves

<u>Explanation:</u>

To avoid the surface waves, a submarine has to submerge below the wave base. It is the position below which the motion of the waves is negligible.

This wave base is equal to half of the wavelength. The equation becomes:

Wave base = $\frac{\text{Wavelength}}{2}$

We are given:

Wavelength = 24 m

Putting values in above equation, we get:

Wave base = $\frac{24m}{2}=12m$

Hence, below 12m of depth, the submarine has to submerge so that it would not be swayed by surface waves

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2 years ago

Una pelota recorre 20 m hacia la derecha y luego 10 m hacia la izquierda, todo en un lapso de tiempo de 10 s , cual es si veloci

zvonat [6]

Answer:

v = 1 i ^ m / s, v = 1 m / s

Explanation:

In this problem we show the difference between vectors and scalars.

The average speed is

v = Δx / Δt

The bold are vectors

Δx = 20-10 = 10 i^ m

v = 10/10

v = 1 i ^ m / s

the unit vector indicates that the velocity is on the x-axis

The average speed is

v =Δx / Δt

v = 10/10

v = 1 m / s

in this case we have a scalar

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3 years ago

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kolezko [41]

The correct answer is b

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2 years ago