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anastassius [24]
3 years ago
5

A boat can move at a constant velocity of 8 km/h in still water. How long will it take for the boat to move 24 km?

Physics
1 answer:
Elis [28]3 years ago
4 0

Answer: D.) 3hrs

Explanation:

Given the following :

A boat can move at a constant velocity of 8 km/h; How long will it take for the boat to move 24 km

Recall:

Velocity = Displacement / time

For the boat to travel a distance of 24 km at a constant velocity of 8km /hr

Time taken = Displacement(distance moved) / velocity

Time taken = 24km / 8kmhr^-1

Tine taken = 3hrs

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A skateboarder rolls off a 2.5 m high bridge into the river. If the skateboarder was originally moving at 7.0 m/s, how much time
saul85 [17]

Answer:

  t = 0.714 s and  x = 5.0 m

Explanation:

This is a projectile throwing exercise, in this case when the skater leaves the bridge he goes with horizontal speed

         vₓ = 7.0 m / s

Let's find the time it takes to get to the river

         y = y₀ + v_{oy} t - ½ g t²

the initial vertical speed is zero and when it reaches the river its height is zero

        0 = y₀ + 0 - ½ g t²

        t = \sqrt{\frac{2y_o}{g}  }

        t = ra 2 2.5 / 9.8

        t = 0.714 s

the distance traveled is

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       x = 7.0 0.714

       x = 5.0 m

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Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. Th
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Explanation:

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As the one fringe is shift, so the optical path changed by one wavelength.

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