PHYSICS HIGH SCHOOL

What statement BEST describes a solid?Question 12 options:


Solids have definite shape and variable volume.


Solids have variable shape and variable volume.


Solids have a definite shape and definite volume.


Solids have a variable shape and definite volume.

Answers

Answer 1
Answer: Solids: definite shape, definite volume
Because they are stiff and the molecules don't move around, they vibrate quickly.
Liquids: indefinite shape, definite volume
Because the shape or "fixed" area of liquids won't stay the same.
Gases: indefinite shape, indefinite volume
Because you've probably noticed, gases are set more freely, allowing molecules to move more freely than in solids and liquids. 
x) Hope I helped! Which do you think it is?
Answer 2
Answer:

Answer:

anwser is c

Explanation:

hope this helps

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stone thrown vertically upward with speed of 15.5m/s from edge of cliff 75.0m high. how much later does it reach bottom of cliff?

Answers

Answer:

Approximately 5.66\; {\rm s}, assuming that g = 9.81\; {\rm m\cdot s^(-2)} and that air resistance is negligible.

Explanation:

Let upward be the positive direction. Under the assumptions, acceleration of the stone would be a = (-g) = (-9.81)\; {\rm m\cdot s^(-2)} (negative since the stone is accelerating downward.)

The duration of the flight can be found in the following steps:

  • Find velocity right before landing given displacement, initial velocity, and acceleration.
  • Find duration of the flight from acceleration and the change in velocity.

In SUVAT equation v^(2) - u^(2) = 2\, a\, x:

  • v is the final velocity right before landing (needs to be found,)
  • u = 15.5\; {\rm m\cdot s^(-1)} is the initial velocity,
  • a = (-9.81)\; {\rm m\cdot s^(-2)} is acceleration, and
  • x = (-75.0)\; {\rm m} is displacement (downward because the stone landed below where it was launched.)

Rearrange this equation to find v:

\begin{aligned}v &= \sqrt{u^(2) + 2\, a\, x} \n &= \sqrt{(15.5)^(2) + 2\, (-9.81)\, (-75.0)} \; {\rm m\cdot s^(-1)} \n &\approx -40.05\; {\rm m\cdot s^(-1)}\end{aligned}.

In other words, the velocity of this stone has changed from the initial value of u = (15.5)\; {\rm m\cdot s^(-1)} to v \approx (-40.05)\; {\rm m\cdot s^(-1)} during the flight. Divide the change in velocity by acceleration a = (-9.81)\; {\rm m\cdot s^(-2)} (the rate of change in velocity) to find the duration of the flight:

\begin{aligned}t &= (v - u)/(a) \n &\approx ((-40.05) - (15.5))/((-9.81))\; {\rm s} \n &\approx 5.66\; {\rm s}\end{aligned}.

In other words, the stone would be in the air for approximately 5.66\; {\rm s}.

Why does a vibraing simple pendulum not produce any sound

Answers

Human ear can hear  the lowest frequency about 20 Hz, this is 20 vibrations per second. Vibrations of pendulum are very small and frequency is less than 20 Hz, so we can't hear it.
It does, but the sound is at a frequency that's too low for you to hear.
If you could build a pendulum short enough so that it made 20 or more
complete swings every second, THEN you'd begin to hear sound from it.

The Sun's energy reaches the earth by _____. conduction convection radiation fusion

Answers

When heat or any other kind of energy move from one place
to another, conduction and convection need some material stuff
along the way, otherwise they don't happen. 

There is no material stuff between the Sun and the Earth, so
the Sun's energy reaches us by radiation.

The Sun's energy reaches the earth by Radiation

Further explanation

Heat is the energy transfer of an object with the environment or other objects because of the temperature difference between the two.

Heat moves from high-temperature objects to low-temperature objects

The process of heat transfer has 3 types

  • 1. Conduction, which is the transfer of energy that requires an intermediate medium and without the transfer of particles
  • 2. Convection is the transfer of energy due to the movement of the particles
  • 3. Radiation is the transfer of energy without an intermediate medium / through vacuum

Energy from sun to earth through its atmosphere is not through conduction because the atmosphere is a bad conductor. Whereas convection is not possible because the earth must be heated first. And conduction and convection cannot pass through vacuum

Heat transfer from the sun occurs because its energy is carried in the form of electromagnetic waves

Learn more

the type of heat transfer takes place when the furnace is up to an entire room

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Convection is a mode of heat transfer

brainly.com/question/1564011

the sun transmits heat to Earth only by radiation

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the process of convection

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Keywords : heat, radiation, convection, conduction, sun

Gravity is a force between any two objects with mass. Why doesn't a person feel a gravitational force between him/herself and another person?A) A person doesn't exert a gravitational force.

B) The two gravitational forces cancel each other out.

C) The gravitational forces of people is so small it is
overshadowed by that of Earth.

D) There are so many people we are actually balanced by all the different gravitational forces.

Answers

The answer would be C. The gravitational force between two bodies however it is too small that it is overshadowed by that of earth. Gravitational force is the weakest force of all. Each body with a mass exerts a gravitational force onto each other but this value is so small that it can be neglected.

The highest point of a wave is called thea. height.
b. trough.
c. crest.
d. wavelength

Answers

The highest point of a wave is called the "crest." A wave is a disturbance that travels through a medium or space, transferring energy without transporting matter. Therefore, the correct answer is option c.

As a wave propagates, it undergoes cycles of oscillation with alternating high and low points. The highest point of a wave, where the displacement or amplitude is at its maximum, is referred to as the "crest." On the other hand, the term "trough" refers to the lowest point of a wave, where the displacement or amplitude is at its minimum in the negative direction. The trough is the opposite of the crest, representing the bottommost part of a wave.

Learn more about Crest here.

brainly.com/question/10598623

#SPJ6

the answer is c ,  crest

A skater goes down a hill with a constant acceleration of 2.25 m/s2 for 50 meters. If the skater's final velocity was 20 m/s, calculate her initial velocity.

Answers

Answer:

The initial velocity of the skater is 13.22 m/s.

Explanation:

Given that,

Acceleration of the skater, a=2.25\ m/s^2

Distance covered, d = 50 m

The skater's final velocity was, v = 20 m/s

We need to find the initial velocity of the skater. It can be calculated using third equation of motion as :

v^2-u^2=2ad\n\nu=√(v^2-2ad) \n\nu=√((20)^2-2* 2.25* 50) \n\nu=13.22\ m/s

So, the initial velocity of the skater is 13.22 m/s. Hence, this is the required solution.

Learn more,

Kinematics

https://brainly.in/question/10299229

Answer:

Vi = Vf - (a * t) just plug this in.

Vi stands for “initial velocity”

Vf stands for “final velocity”

a stands for “acceleration”

t stands for “time”
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