A.

Neither sound waves nor light waves can travel through a vacuum.

B.

Sound waves can not travel through a vacuum but light waves can.

C.

Both sound waves and light waves can travel through a vacuum.

D.

Light waves can not travel through a vacuum but sound waves can.

**Answer:**

B mate

**Explanation:**

Nanananananakakskskdjdjs

HELP PLEASE!!! 15 POINTS

How does the speed of waves vary in different media?

Radio waves are used to transmit verbal messages through space.

IS THIS TRUE OR FALSEE???

This will be true plz give me brainless

Which of the following describes an ionic compound (or what is true for ionic compounds)?

a. It has a low melting points

b. It consists of shared electrons

c. It conducts electric current in water solution

d. It consists of two non-metals

**Answer:**

a b c

**Explanation:**

b. It consists of shared electrons

c. It conducts electric current in water solution

d. It consists of two non-metals

What are Ionic compound?**Ionic compounds** are neutral compounds made up of positively charged ions called **cations **and negatively charged ions called **anions.**

For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.

The properties of **ionic compound **are:

Therefore,

b, c, d are the correct answer.

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A stone dropped from the top of a building strikes the ground in 4.2 s. How tall is the building? Someone explain please!

**Answer:**

well i'm not sure if which unit of measure you need but i think its 86.49 meters tall.

Well every objects Acceleration is 9.8 meters per second per second. So 9.8 m/s faster every second. I’m not exactly sure how to solve that though

A car starts from rest and accelerates for 2.9 s

with an acceleration of 2 m/s2.

How far does it travel?

Answer in units of m.

**Answer:**

[tex]a \: = \frac{v - u}{t} [/tex]

2 = v-0/2.9

2× 2.9 = v

v = 5.8 m/s

[tex]v \: = \frac{d}{t} [/tex]

5.8 = d/2.9

5.8×2.9 = d

d = 16.82 m

Plz I need the answer quick!!!

What is the definition of law of conservation of energy￼

**Answer:**

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside. This is particularly confusing in the case of non-conservative forces, where energy is converted from mechanical energy into thermal energy, but the overall energy does remain the same. The only way to use energy is to transform energy from one form to another.

**Explanation:**

Hope this helps!

Answer:

means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

Explanation: this is a shorter answer.

The gradual change in a species over time is called

a.

mutation.

b.

evolution.

c.

migration.

d.

variation.

PLZ HURRY WILL GIVE BRAINLIEST

Answer: B. Evolution

Explanation:

As species grow older over time they will gradually evolve through natural selection and evolution.

The gradual change in a **species **over time is known as **evolution (b).**

The process of evolution occurs through several mechanisms, including mutation, migration, and natural selection.

Mutation (a) is the spontaneous change in the genetic material of an **organism**. These changes can result in new traits that may be advantageous, disadvantageous, or neutral for survival. When mutations occur, they can introduce genetic variation within a population, which serves as the raw material for evolution.

Natural selection is a crucial factor driving evolution. Individuals with advantageous traits that better suit their **environment **are more likely to survive and reproduce, passing on these advantageous traits to their offspring. Over generations, the frequency of beneficial traits increases in the population, leading to the adaptation and evolution of the species.

Variation (d) encompasses the differences in **physical traits** and genetic makeup among individuals within a population. This variation is essential for evolution to occur since it provides the raw material for natural selection to act upon.

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Alguien ayudeme con estos problemas de fisica porfa 1. Una persona recorre 4200 m en 25 minutos, luego 4.54 Km en un hora y finalmente 9000 m en 55 minutos. Halle, el tiempo total empleado en minutos, su velocidad y rapidez. 2. Una partícula en una circunferencia de 40 cm de diámetro da 30 vueltas completas en dos minutos. Halle la velocidad y rapidez de la partícula. 3. Una persona da 500 pasos de 40 cm al oeste, luego 400 pasos de 35 cm al norte y finalmente 300 pasos de 30 cm al este utilizando en total 2 min y 120 segundos. Halle la distancia recorrida, desplazamiento, velocidad y rapidez. 4. Una persona recorre una pista circular de 250 metros de radio, ¿Cuál es su distancia, desplazamiento, velocidad y rapidez en dar media vuelta a la pista si el tiempo empleado es de 90 segundos

**Answer:**

1) t_total = 140 min , v = 126.7 m / min , 2) v = 0.628 m / s ,

3) v = 0.592 m / s , θ = -39.3 º

**Explanation:**

Here we have some short kinematics problems

1) d₁ = 4200 m at T1 = 25 min

d₂ = 4.54 km at t2 = 1 h

d₃ = 9000 m at t3 = 55 min

of the statement the direction of each route is the same

Let's reduce the distances to the SI system

d₂ = 4.54 km (1000 m / 1 km) = 4540 m

t₂ = 1 h (60 min / 1 h) = 60 min

Total time is

t_total = t1 + t2 + t3

t_total = 25 + 60 +55

t_total = 140 min

the distance is

d_total = 4200 + 4540 +9000

d_total = 17740 m

with movement it is in one dimension and all displacement is in the same direction, distance equals displacement.

Speed is

v = 17740/140

v = 126.7 m / min

in the direction of travel

Speed is the modulus of speed

| v | = 126.7 m / min

2) the angular velocity is

w = θ / t

In this exercise

t = 2 min (60 s / 1min) = 120 s

θ = 30 rev (2π rad / 1 rev) = 60π rad

w = 60π / 120

w = 1.57 rad / s

linear velocity is

v = w r

v = 1.57 0.40

v = 0.628 m / s

velocity is the speed tangential to the trajectory

3) the data for this exercise are

distance = (number of steps) (distance of one step)

d₁ = 500 0.40 m = 200 m West

d₂ = 400 0.35 m = 140 m North

d₃ = 300 0.30 m = 90 m East

in a total time of t = 2 min and 120 s

t = 2 60 + 120 = 240 s

the distance traveled is

x axis we assume the direction towards + x (East) positive

x_total = d₃ -d₁

x_total = 90-200 = -110 m

y axis

y_total = d₂

y_total = 140 m

we use the Pythagorean theorem to find the distance0

D = √ (x_total² + y_total²)

D = √ (110² + 90²)

D = 142.13 m

The speed is

v = D / t

v = 142.13 / 240

v = 0.592 m / s

speed is

v = 0592 m / s

tan θ = Y / X

θ = tan -1 y / x

θ = tan -1 (90 / (- 110))

θ = -39.3 º

4) This angle is measured on the positive side of the x axis in a clockwise direction

θ = 1.5 rev (2π rad / 1 rev) = 3π rad

t = 90 s

the angular velocity is

w = θ / t

w = 3πi / 90

w = 0.1047 rad / s

the speed is

v = w R

v = 0.14047 250

v = 26.17 m / s

velocity is tangent to path

m1=200g m2=150g

find the acceleration

the track is horizontal and frictionless

**Answer:**

50 or 1.3333

**Explanation: Explanation you cancel out the mass and the force to see what your acceleration would be or you could divide F by M**

how can magnetic potential energy be transferred to kinetic energy

**Answer:**

A magnetic force can convert kinetic energy stored in a magnetic field to potential energy. Kinetic energy can convert potential energy stored in a gravitational field. A magnetic energy can convert potential energy stored in a gravitational field to kinetic energy.

car decelerates uniformly and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration while slowing down?

Help!!!!

**Answer:**

[tex]a=-1.388\ m/s^2[/tex]

**Explanation:**

Initial velocity of car, u = 50 km/h = 13.88 m/s

It stops, v = 0

Time, t = 10 s

**We need to find the car's deceleration while slowing down. As the car is slowing down, it will have deceleration. It can be calculated as follows :**

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{0-13.88 }{10}\\\\a=-1.388\ m/s^2[/tex]

**So, the deceleration of the car is **[tex]1.388\ m/s^2[/tex].

What is the speed of an object that travels 60 meters in 4 seconds?

a) 240 m/s

b) 15 m/s

c) 0.067 m/s

d) 15 mph

**Answer:**

B) 15 m/s

**Explanation:**

Since most of the answer choices are in m/s, you can try dividing 60 meters/4 seconds in order to get the seconds on the bottom to become 1 second.

You want to find how many meters the object can travel in 1 second, rather than 4 seconds.

[tex]\frac{60 \ m}{4 \ s} \div \frac{4}{4} = \frac{15 \ m}{1 \ s}[/tex]Now you can see that for every 1 second of time, the object can travel 15 meters. This corresponds to answer choice **B) 15 m/s**.

The last option, D, is incorrect because we are not dealing with hours as our unit of time. We are dealing with seconds.

**Answer:**

b) 15 m/s

hope it help you

If your speed is 3 meters in 1 second (3m/s), how long would it take you to go 15

meters?

**Answer:**

5 seconds

**Explanation:**

**Answer:**

5 seconds

**Explanation:3=1 6=2 9=3 12=4 15=5 15 equal 5 mean 15 meters in 5 sec**

What would you not find on an acceleration graph? *

O pie chart

O x axis

O time

O velocity

Pie Chart is the correct answer

3. What are the two parts of a shadow?

O opaque area and dark area

the umbra and penumbra

O the umbra and

antunghaya

O the illuminated opaque object and the umbra

**Answer:**

the umbra and penumbra

**Explanation:**

The two parts of a shadow are the umbra and penumbra.

A shadow is an expression formed when light from a source is cut blocked by an opaque body.

Most shadows are made up of two parts, umbra and penumbra.

The umbra is the darkest, and the innermost part of a shadow. In the penumbra, only a portion of the light source is blocked. It is more of like a partial shadow.The umbra is directly formed by light which impinges on an opaque body and it completely cut off.

Help PLZ ;)

If the distance between two objects increases, what happens to the force of gravity between them?

(A) Increases

(B) Decreases

(C) Stays the same

**Answer:**

B) Decreases

**Explanation:**

Gravitational force is inversely proportional to distance. As distance between 2 objects increase, gravitational force between the 2 objects decreases.

Hope this helps!

**Answer:**

The answer would be B

**Explanation:**

You walk east for 30 m, then decide to walk north foranother 30 m. What is the angle of direction of your displacement?

**Answer:**

Displacement is 42.426 m NE and the angle is opposite/adjacent or 30/30 which would equal 1 degree which doesn't seem right but hopefully its an answer.

**Explanation:**

Which is inversely proportional to your weight on a planet's surface?

A. Only your mass

B. Your mass and the mass of the planet

O O O

C. Only the planet's mass

D. The distance from the surface to the center of the planet

**Answer:**

most likely D

**Explanation:**

Distance from the surface to the center of the planet is **inversely **proportional to your **weight **or **force **due to gravity on a planet's surface.

A **force **is an effect that can alter an object's motion according to physics. An object with mass can change its **velocity, or accelerate**, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both **magnitude and direction.**

The gravitational constant, denoted by the capital letter G, is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's theory of general relativity.

f = Gmm/r²

Distance from the surface to the center of the planet is **inversely **proportional to your **weight **or **force **due to gravity on a planet's surface.

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An object has an acceleration of 6m/s/s. If the net force was tripled and the mass was doubled, then the new acceleration would be

Acceleration = Force / mass

New acceleration = 3F / 2m = 1.5 x the old acc = 9 m/s/s

New acceleration = 3F / 2m = 1.5 x the old acc = 9 m/s/s

How do you find the distance a object has traveled

**Answer: Got this from a web search... Change the answer up a bit**

**Explanation:**

The distance travelled is the path taken by a body to get from an initial point to an end point in a given period of time, at a certain velocity. If the velocity is constant: Distance = time * velocity. d = v*t.

**Answer:**

I researched and found it to be TIME * VELOCITY ( d= v*t)

**Explanation:**

**When I use * I just mean multiply. So its time 'multiplied by velocity' in order to get 'distance'**

A mover applies a net force of 28 N to a sofa that has a mass of 70 kg.

What will the sofa's acceleration be?

**Answer: .4 m/s^2= acceleration**

**Explanation:**

f = m*a

We can rearrange this equation to solve for acceleration. Therefore,

a=f/m

a= 28N/70kg

a= 0.4 m/s^2

Activity 3. Let's Do The Mathi

Direction: Use Newton's second law equation to solve for force, mass, and acceleration

Problem 1- A ball with a mass of 0.5 kg is hit with a force of 2.5N. What is its acceleration?

Problem 2- What is the acceleration of a 15kg box that is pushed across a horizontal surface

with a force of 50N?

Problem 3- An object with a mass of 2.0 kg has a force of 5.0 N applied to it. What is the

resulting acceleration of the object?

Problem 4- An object with a mass of 3.0 kg accelerates 2.5 m/s2 when an unknown force is

applied to it. What is the amount of the force?

Problem 5- An object accelerates 12.0 m/s2 when a force of 6.0 N is applied to it. What is the

mass of the object?

**Answer:**

Problem 1-

The acceleration = 5 m/s²

Problem 2 -

The acceleration = 3.[tex]\overline 3[/tex] m/s²

Problem 3 -

The acceleration = 2.5 m/s²

Problem 4-

The force applied = 7.5 N

Problem 5-

The mass of the object, = 0.5 kg.

**Explanation:**

Problem 1-

The mass of the ball, m = 0.5 kg

The force (applied) with which it was hit, F = 2.5 N

The acceleration, a = Force/Mass = 2.5 N/(0.5 kg) = 5 m/s²

The acceleration = 5 m/s²

Problem 2 -

The mass of the box, m = 15 kg

The force (applied) with which it was hit, F = 50 N

The acceleration, a = Force/Mass = 50 N/(15 kg) = 10/3 = 3.[tex]\overline 3[/tex] m/s²

The acceleration = 3.[tex]\overline 3[/tex] m/s²

Problem 3 -

The mass of the object, m = 2.0 kg

The force (applied) with which it was hit, F = 5.0 N

The acceleration, a = Force/Mass = 5.0 N/(2.0 kg) = 2.5 m/s²

The acceleration = 2.5 m/s²

Problem 4-

The mass of the object, m = 3.0 kg

The acceleration, a, of the object = 2.5 m/s²

The force applied to it, F = Mass × Acceleration = 3.0 kg × 2.5 m/s² = 7.5 N

The force applied = 7.5 N

Problem 5-

The acceleration, a, of the object = 12 m/s²

The force applied, F = 6.0 N

The mass of the object, m = Force/Acceleration = 6.0 N/(12 m/s²) = 0.5 kg

The mass of the object, = 0.5 kg.

Explain how if a solid, liquid, and gas are put into individual containers how they fill the container.

**Answer:**

**serial in which container is filled**

**Solid -base of container**

**Liquid- above solid**

**Gas- above liquid**

**Explanation:**

If any mixture of matter in different state (that solid , liquid or gas )are kept in any container, then substance with higher density will be settled at lowest surface first and similarly the substance with lowest density will be at upper part of container.

In the given container we have to keep solid, liquid and gas

based on this

**solid will be at surface of container**

**above sold will be liquid **

**above liquid will be presence of Gas**

**serial in which container is filled**

**Solid -base of container**

**Liquid- above solid**

**Gas- above liquid**

Newton's first law of motion is also called the law of

.

**Answer:**

The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. Newton's first law of motion is often stated as. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

**Explanation:**

**Answer:**

Newton's first law is also called the law of **Inertia.**

**Explanation:**

The property of a body by virtue of which it wants to remain in its position, is called inertia.

Mainly there ae three types of inertia-

Inertia of restInertia of motion Inertia of directionInertia was discovered by **Galileo **and it was modified by **Newton.**

If a body is in motion or in rest, it wants to remain in its position unless any external force is applied.

Thus** Newton's first law of motion is also called law of inertia.**

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please can i have help with this question

Opposites attract so north goes to south and Vice versa. When the same poles are facing each other they push away when they are opposites they attract.

Molten (melted) iron and carbon monoxide are produced in a blast furnace by the reaction of iron(III) oxide and pure carbon. Fe2O3 + 3C ---> 2Fe + 3CO If 4 moles of Fe2O3 are used, how many moles of Carbon Monoxide (CO) can be produced?

**Answer:**

**Explanation:**

Fe₂O₃ + 3C ---> 2Fe + 3CO

1 mole 3 moles

From the balanced equation above , we see that , 1 mole of Fe₂O₃ reacts with carbon to form 3 moles of CO .

So , 4 moles of Fe₂O₃ will react with carbon to form 3 x 4 moles of CO .

moles of CO formed = 3 x 4 moles = 12 moles.

How long would it take Jesse with an acceleration of -2.50 m/s2 to bring his bicycle with an initial velocity of 13.5 m/s to a complete stop?

Answer: 5.4 seconds

Explanation:

The time taken to stop the bicycle is 5.4 seconds. The final **velocity** is zero. Then, the** distance** travelled by the **bicycle** is 36.45 m.

**Acceleration** is a physical quantity that, measures the rate of change in velocity. It is a vector quantity thus having both magnitude and direction. It can be defines as the ratio of change in velocity to the change in time.

Given** initial velocity** = 13.5 m/s

final velocity is zero since the bicycle is stopping.

then Δt = Δv/a

Δt = 13.5 m/s/ 2.50 m/s² = 5.4 seconds.

Hence, the bicycle will take 5.4 s to complete stop.

The **distance** covered within this time can be determined using the equation as follows:

s = ut + 1/2 at²

where u is the initial velocity

s = (13 m/s × 5.4 s) + (-2.50 m/s² ×5.4 s ×5.4 s) = 36.4 m.

Therefore, the bicycle will travel up to 36.4 m before stopping.

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Who am I answer key

**Answer:**

huh

**Explanation:**

PLEASE HELP ASAP WILL MARK BRAINLIEST

Select ALL the correct answers.

Which of these factors make hydrogen fuel cells a better option than burning fossil fuels?

1.Hydrogen fuel cells have a higher energy efficiency.

2.Hydrogen fuel cells create less pollution.

3.Burning fossil fuels relies on outdated devices and technology.

4.Hydrogen is the most abundant element in the universe.

5.Hydrogen fuel cells are more expensive than fossil fuels.

**Answer:**

1) and 2)

**Explanation:**

Hydrogen fuel is very efficient. More energy is extracted from this fuel source than with conventional power technologies, according to Tobin Smith for Billion Dollar Green. Fossil fuels have a high combustion rate and are capable of releasing tremendous amount of energy.

An object has a mass of 20,000kg and a density of 4000kg/m? What is its

volume?

The answer is 20000kg

A skydiver jumps from an airplane traveling 120. km/hr at a height of 1000. m. If his parachute must open 500. m above the ground, how long does he have for the chute to open?

**Answer:**

The parachute to open in 15 sec.

**Explanation:**

**Given that,**

Velocity = 120 km/hr

Height = 1000 m

If his parachute must open 500. m above the ground.

**We need to calculate the time for parachute to open **

**Using formula of time**

[tex]v=\dfrac{d}{t}[/tex]

[tex]t=\dfrac{d}{v}[/tex]

Where, d = distance

t = time

v = velocity

Put the value into the formula

[tex]t=\dfrac{500}{120\times\dfrac{5}{18}}[/tex]

[tex]t=15\ sec[/tex]

**Hence, The parachute will be open in 15 sec.**

x 2 +2x8=The answer is (x-2) (x+4)
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What measures did Georgia's royal governors take to encourage settlers to stay in Georgia? A.They lifted the prohibitions on the sale of all types of alcohol. B.They lifted regulations restricting land ownership and banning slavery. C.They offered land grants to any settlers whose child was born in the colony. D.They annexed part of Florida and offered land to any settler willing to move there.
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