Wood burning is a chemical reaction. However, wood does not just spontaneously catch on fire. It needs ____________ to begin the chemical reaction.

A) Chemical Energy
B) Physical Energy
C) Electron Energy
D) Activation Energy

Answers

Answer 1
answer: a.) chemical energy
explanation: fire needs a chemical reaction which leads to energy in the form of heat being produced. it turns kinetic energy into the form of heat.
Answer 2

Answer:

A chemical energy

Explanation:

This is the answer


Related Questions

A stationary speed gun emits a microwave beam at 2.10x10^10 Hz. It reflects off a car and returns 638 Hz lower. What is the speed of the car? (Unit=m/s)

Answers

Answer:

The answer is 4.55 m/s!

Explanation:

I wish you luck with Acellus! We got 15 days left!

Please mark brainliest.

The speed of the car will be approximately 9.14 meters per second.

To find the speed of the car, we can use the Doppler effect equation for frequency shift:

Δf/f₀ = v/c

where:

Δf = frequency shift (638 Hz lower in this case)

f₀ = original frequency emitted by the speed gun (2.10x10¹⁰ Hz)

v = velocity of the car

c = speed of light in a vacuum (approximately 3.00x10⁸ m/s)

We need to rearrange the equation to solve for the velocity (v) of the car:

v = Δf/f₀ × c

Now, let's plug in the values:

Δf = 638 Hz

f₀ = 2.10x10¹⁰ Hz

c = 3.00x10⁸ m/s

v = 638 Hz / 2.10x10¹⁰ Hz × 3.00x10⁸ m/s

Calculate the value:

v ≈ 9.14 m/s

So, the speed of the car is approximately 9.14 meters per second.

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Why has the study of genetic differences in intelligence been so controversial?
A.
Genetics has no role in intelligence.
B.
The studies didn’t really measure differences in genetics.
C.
The idea of genetic differences has often been used to justify racial discrimination.
D.
All of the above

Answers

Final answer:

The controversy over genetic differences in intelligence primarily relates to the misuse of genetic arguments for racial discrimination and the oversight of environmental influences on intelligence.

Explanation:

The study of genetic differences in intelligence has been controversial due to several factors. The primary concern arises from the historical use of genetic arguments to justify racial discrimination. These views, although scientifically refuted, have at times resurged, as in the case of 'The Bell Curve'. Notably, the controversy arises from interpretations that link genetics and race with intelligence without accounting for the significant influence of environmental variables. Additionally, research has shown a closing of IQ gaps with increased access to education, pointing to nurture's critical role in intelligence development. The persistence of the idea that intelligence could be predetermined by race without adequate consideration of environment and socioeconomic factors contributes to the ongoing debate.

Moreover, there is a recognition that intelligence is affected both by genetics and environment, with environmental influences shaping the manifestation of cognitive abilities. Twin studies show a genetic component to intelligence, but conflict theorists note that IQ tests can be biased and do not always offer a fair assessment of a person's intellectual capabilities, reinforcing the complex interplay of genetics, environment, and social factors in the development of intelligence.

Jennifer and Janna are trying to figure out how to control the mouse problem in their horse barn. They have tried several types of traps baited with peanut butter with no luck. The girls decide that the problem might not be the type of trap; it might be the type of food. What is the BEST question for the girls to use on their next experiment?

Answers

Answer:

It is option A because girl notices that it is matter of food which depends.

Explanation:

Answer: Your answer would be C

Explanation: None of the traps work with peanut butter, the next step is to test each type of trap individually with different foods. Hope this helps :)

A point charge Q = -400 nC and two unknown point charges, q1 and q2, are placed as shown. Point charge q1 is located 1.3 meters along the +x-axis, point charge q2 is located 0.7 meters down the -y-axis, and point charge Q is located 2.0 meters from the origin at an angle of 30° above the x-axis. At the origin, the three charges together create an electric field that has magnitude zero. What is the charge q1?
150 nC

120 nC

–120 nC

–150 nC

250 nC

Answers

Final answer:

To find the charge q1, set up equations for the electric fields created by each charge and solve them simultaneously. The value of q1 is -150 nC.

Explanation:

To find the charge q1, we need to consider the electric field created by each of the three charges separately. Since the total electric field at the origin is zero, the electric fields from charges Q, q1, and q2 must sum up to zero.

We can use the formula for the electric field due to a point charge, which is given by E = k * Q / r^2, where k is the electrostatic constant, Q is the charge, and r is the distance from the charge to the point of interest. By setting up equations for the electric fields from each charge and solving them simultaneously, we can find the value of q1.

After solving the equations, we find that the charge q1 is equal to -150 nC.

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If a race car is traveling South due to a 30N force and the parachute deploys resulting in a 10N force North what is the Net Force (or Resultant Force)?

a) 40n east
b) 40n south
c) 10n west
d) 20n south

Answers

Answer:

F = 20 N south  

Explanation:

It is given that,

Force applied on the racing car in south direction is 30 N and parachute deploys resulting in a 10 N force due North.

We need to find the net force on the car.

Let North denotes +y axis and South denotes -y axis.

So, F₁ = +10 N

F₂ = -30 N

Net force is :

[tex]F=F_1+F_2\\\\F=10+(-30)\\\\F=-20\ N[/tex]

It means that the net force is 20 N and it is acting in south. Hence (d) is correct.    

Why is permeable soil best for plants that need a lot of drainage? Water fills this type of soil. Water dries up in this type of soil. Water flows through this type of soil. Water pools on top of this type of soil.

Answers

Answer:

Water flows through this type of soil.

Explanation:

By definition permeable soil is soil which water and other fluid flow easily through (like sand) If a plant needs drainage the soil will need to flow through the soil easily.

The three basic items to make an electromagnet are a source of current, conducting wire, and a metal _______.

Answers

Answer:

Metal core

Explanation:

Answer:

core

Explanation:

Which expressions correctly represent variations of Ohm's law? Check all that apply.

Answers

Answer:

V = IR

R = V/I

I = V/R

Explanation:

If one wave of 10 m amplitude meets constructively with another of amplitude 20
m, what is the new amplitude?
20 m
30 m
200 m
10 m

Answers

Answer:

B. 30m

Explanation:

This is because when a wave interferes constructively with another wave, they will add since constructive relates to joining or building up.

So, 10m + 20m equals a 30m wave.

A gene is
1. a change in a DNA sequence
2. the 2-letter code representing the alleles inherited from parents
3. a part of a chromosome that controls a particular trait, like eye color
4. a characteristic that is inherited, like eye color​

Answers

Answer:

C - a part of a chromosome that controls a particular trait, like eye color

Explanation:

(if theres an option to pick two, i would pick C and D)

True or False: when measuring speed the distance must be considered to be rectilinear (in a line)

Answers

Answer:

I'm pretty sure it's False

Answer:

I dont know if I'm correct but I have to go with False

Explanation:

PLEASE HELP ME!!! the equations are around the question itself.

Answers

I’m so so sorry I wish I could help.... My best answer is no because they have different shapes but I am not sure

PLEASE HELP

Matilda pushes her bike with a force of 5 Newtons. If she increases her force to 6 Newtons, her bike will —
not change its acceleration
accelerate more quickly
accelerate more slowly

Answers

C accelerate more quickly

Answer:

c

Explanation:

A ball is dropped from rest from a Cliff and falls for 3 seconds.
Neglecting air resistance, the final velocity of the ball is
m/s. (g = -9.8 m/s2)
Enter the answer

Answers

Answer:

-29.4 m/s

Explanation:

Given:

v₀ = 0 m/s

t = 3 s

a = -9.8 m/s²

Find: v

v = at + v₀

v = (-9.8 m/s²) (3 s) + (0 m/s)

v = -29.4 m/s

The final velocity of a ball dropped from rest for 3 seconds is -29.4 m/s.

How to find final velocity?

Given the following information:

The ball is dropped from rest.

The acceleration due to gravity is g = -9.8 m/s².

The time the ball falls is t = 3 seconds.

Use the following formula to calculate the final velocity of the ball:

v = v_0 + g × t

where:

v is the final velocity of the ball

v_0 is the initial velocity of the ball (which is 0 in this case)

g is the acceleration due to gravity

t is the time

v = 0 + (-9.8 m/s²) × 3 seconds

v = -29.4 m/s

Therefore, the final velocity of the ball is -29.4 m/s.

The negative sign indicates that the velocity is downwards.

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An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of 28.1°C. Determine the specific heat capacity of the zinc.

Answers

Answer:

383.34 J/kg.K

Explanation:

From the question,

Heat lost by zinc = heat gained by water in the Styrofoam cup.

c'm'(t₁-t₃) = cm(t₃-t₂).............. Equation 1

Where c' = specific heat capacity of zinc, m' = mass of zinc, t₁ = initial temperature of zinc, t₂ = initial temperature of water in the Styrofoam cup, t₃ = temperature of the mixture

Make c' the subject of the equation

c' = cm(t₃-t₂)/m'(t₁-t₃).............. Equation 2

given: m' = 11.98 g = 0.01198 kg, m = density of water×volume of water = (1×50) = 50 g = 0.05 kg, t₁ = 78.4°C, t₂ = 27°C,  t₃ = 28.1°C

Constant: c = 4200 J/kg.K

Substitute these values into equation 2

c' = 0.05×4200(28.1-27)/[0.01198×(78.4-28.1)]

c' = 231/0.602594

c' = 383.34 J/kg.K

If the mass of Mars is 0.11 ME (mass of Earth) and its radius is 0.53 RE (radius of
Earth), 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

lake water flows downward through tunnels

Answers

Answer:

what's your question?

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