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3 years ago

A ball of mass of 0.5kg is dropped from a height of 2m.

Physics

1 answer:

erastovalidia [21]3 years ago

3 0

Answer:

6.3m/s

Explanation:

Given parameters:

Mass of the ball = 0.5kg

Height = 2m

Unknown:

Velocity when the ball hits the ground = ?

Solution:

Since the potential energy is transformed into kinetic energy;

P.E = K.E

mgh = $\frac{1}{2}$ m v²

cancelling m;

gh = $\frac{1}{2}$ v²

v² = 2gh

v = √2gh

Insert the parameters and solve;

v = √2gh = √ 2 x 9.8 x 2 = 6.3m/s

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3 years ago

A mass is tied to a string and swung in a horizontal circle with a constant angular speed. show answer No Attempt If this speed

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Answer:

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Explanation:

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4 years ago

You are trying to hear your friend give directions to new store in town. But from your distance (1 point) of 15 m you only hear

Marat540 [252]

Answer:

option D

Explanation:

given,

Intensity of sound = 20 dB

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distance between the sound level = ?

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3 years ago

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Andre45 [30]

Answer:

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3 years ago

Read 2 more answers

The local high school is installing new bleachers at the stadium and must also add handrails to meet code. The students know the

Advocard [28]

Answer:

The handrails must be approximately 10.63 meters long

Explanation:

The given parameters are;

The height of the bleachers, h = 8 m

The depth of the bleachers, d = 7 m

The length of the hand rails to go along the bleachers from bottom to top is given by Pythagoras' Theorem as follows;

The length of the hand rail = √(d² + h²)

∴ The length of the hand rail = √(7² + 8²) = √113 ≈ 10.63

In order for the handrails to go along the bleachers from top to bottom, they must be approximately 10.63 meters long.

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3 years ago