PHYSICS MIDDLE SCHOOL

Acoustics involves the study of _______ and the mediums through which they travel.A.Light waves
B.mechanical waves
C.electromagnetic waves
D.gamma rays

Answers

Answer 1
Answer:

Answer: The correct option is B.

Explanation:

Acoustic deals with the study of mechanical waves and the mediums through which they travel. It includes sound, infra sound, ultrasound and vibrations.

The mechanical wave is a wave which can travel through a material medium. It can travel through solid, liquid and gases. Sound is the mechanical vibrations of the particles of a gaseous medium.

Therefore, acoustic involves the study of mechanical waves and the mediums through which they travel.
Answer 2
Answer: the answers B,mechanical waves

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A child is sledding. He starts at the top of the hill with a velocity of zero, and 3 seconds later he is speeding down the hill at 12 meters per second. What is the child's acceleration?

Answers


Magnitude of acceleration = (change of speed) / (time for the change) =

                                             (12 m/s  -  0)   /   (3 sec)  =

                                               12/3  =  4 m/s²

What's a challenge question ?  Have we all passed the event horizon
and been spaghettified without knowing it ?

If an object is falling downward, is the acceleration due to gravity (9.8 m/s/s) negative?

Answers

NO! ACCELERATION IS NEVER NEGATIVE UNLESS IT IS SLOWING DOWN.
No because the acceleration is getting larger. If the object was slowing down it would be negative. It does not matter in direction. Its wether is is speeding up or slowing down.

If the mass of Mars is 0.11 ME (mass of Earth) and its radius is 0.53 RE (radius ofEarth), How much is the gravitational field g at the surface of Mars?
Given: ME=6.0x1024 kg and RE=6.4x106m

Answers

Answer:

3.8 m/s²

Explanation:

g = GM / R²

g = G (0.11 ME) / (0.53 RE)²

g = 0.39 G ME / RE²

g = 0.39 (9.8 m/s²)

g = 3.8 m/s²

Answer:

vote me brainliest! Please!

simple put is 3.8 m/s²

took it on edge 2020

How are intensity sound and energy related

Answers

sound is a form of energy in that it consists fluctuations of air pressure . The speed of the fluctuations is measured in cycles per second or Hertz (HZ)

Intensity is how large the fluctuations are, also known as amplitude and for the sound the unit is decibels of sonic pressure level (dB SPL)

What was the hiker's total displacement?A.24 km  B.4 km north  C.14 km northeast  D.0 km

Answers

we can see it as two movements: one on the north-south axis and one on the west-east axis.

On the north-south Axis, the hiker went 8 km north and 4 km south, so in total the hiker went 4 km north (we can subtract one for the other and the direction remains that which was bigger)

On the west-easth Axis, the hiker went 6 km east and 6 km west, so in total the hiker  didn't move on this axis! or, he/she moved but then "came back"

So in total, the hiker only moved4 km north - answer B.

Answer:

its b

Explanation:

ik

During the course of trajectory the horizontal component of the velocity is; A) constant
B) increasing
C) decreasing
D) negative

Answers

The horizontal component of the velocity remains constant in a trajectory course.

Answer: A

Explanation:

The trajectory path is formed due to the gravitational pull acting on the object thrown from some point either upward or downward.

As it is known that the velocity is divided into horizontal and vertical component, the vertical component of the velocity of the object thrown will be mainly influenced by the gravitational pull as it acting in vertical direction only.

So the vertical component of the object following a trajectory path will be changing at a rate of 9.8 m/s2 which is the acceleration due to gravity.

On the other hand, the horizontal component of the velocity will remain constant in order to maintain the law of conservation of energy.

im not 100 percent sure but i think its a
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