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2 years ago

Sounds are reflected best when bounced off [answer] hard surfaces.

Physics

1 answer:

yuradex [85]2 years ago

3 0

Sounds are reflected best when bounced off the flat surfaces.

<h3>What is a sound wave?</h3>

A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.

Since sound waves cannot easily pass through hard surfaces, they bounce off them instead, reflecting back to the source which they first came from.

When sound is reflected off of flat surfaces, it does so most effectively.

Hence the flat surface is the correct answer.

To learn more about the sound wave refer to;

brainly.com/question/11797560

#SPJ1

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Which lobes of the brain receive the input that enables you to feel someone scratching your back? (2 points)

andrew-mc [135]

Answer: Parietal

Explanation: The parietal lobe is where the primary somatosensory cortex is located. This cortex is where all tactile stimulation is processed in the brain and allows to you detect/feel someone scratching your back.

3 0

3 years ago

A pendulum of length l=5.0m attached to the ceiling carries a ball of mass 10.0 kg. The ball (a massive bob) is moved from its s

never [62]

Answer:

Em₀ = 245 J

Explanation:

We can solve this problem with the concepts of energy conservation, we assume that there is no friction with the air.

Initial energy the highest point

Em₀ = U

Em₀ = m g h

The height can be found with trigonometry

The length of the pendulum is L and the length for the angle of 60 ° is L ’, therefore the height from the lowest point is

h = L - L’

cos θ = L ’/ L

L ’= L cos θ

h = L (1 - cos θ)

We replace

Em₀ = m g L (1- cos θ)

Let's calculate

Em₀ = 10 9.8 5.0 (1 - cos 60)

Em₀ = 245 J

3 0

3 years ago

3. Question

aalyn [17]

2. Newton's laws of motion

5 0

3 years ago

Read 2 more answers

The maximum torque on a set of 20 square loops with edge lengths of 6 cm in a 4.0 T magnetic field is:A) 0.288 N-m.B) 4.8 N-m.C)

Vesnalui [34]

Answer:

option (D

Explanation:

Torque is given by

torque = N x i x A x B x sinФ

where, N is number of turns, A is area, b is the magnetic field and Ф be the angle between the area vector and the magnetic field vector, i be the current.

So, torque depends on the current.

option (D)

6 0

3 years ago

How high must you lift a 25 Newton book for it to have the same increase in potential energy as a 20 Newton book that was lifted

Annette [7]

Given :

An object with weight 20 N was lifted to 0.5 meters.

To Find :

How high must you lift a 25 Newton book for it to have the same increase in potential energy as the given book.

Solution :

Since both have same potential energy :

$P.E_2 = P.E_1\\\\W_2h_2 = W_1h_1$

Putting all given values in above equation :

$25h_2 = 20\times 0.5\\\\h_2 = \dfrac{20\times 0.5}{25}\\\\h_2 = 0.4\ m$

Therefore, book with same potential energy is at a height of 0.4 m.

4 0

3 years ago