1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Andrej [43]
3 years ago
9

When you rub a match against a rough surface, fire results, giving off light and heat. The law of conservation of energy says th

at energy cannot be created.
How can you explain the fire seeming to come from nowhere?

The energy was stored in chemical bonds before it became heat and light.
Matches are made to take up energy from surfaces.
The energy started out as the sound energy of the rubbing match.
Physics
2 answers:
Trava [24]3 years ago
7 0
The law of conservation of energy states that energy can neither be created nor destroyed. striking a match stick with a surface that conducts heat, it is not part of the law
shutvik [7]3 years ago
4 0
The energy was stored in chemical bonds before it became heat and light, it is the result when you rub a match against a rough surface. Energy can not be created nor destroyed but it can be stored, potential energy is stored in a match when you strike it, it releases that energy.
You might be interested in
1. If you add air to a flat tire through a single small entry hole, why does the air spread out to fill the tire?
ikadub [295]

Answer:

The tire fills up just like anything else that holds air when u pump a ball or tire up it fills all the way up cause it is a small confined space and after filling it with air the atoms of the air fill the tire up

Explanation:

7 0
3 years ago
Choose the statement(s) that is/are true about the ratio \frac{C_p}{C_v} C p C v for a gas? (Ii) This ratio is the same for all
Blababa [14]

Answer:

(i) false

(ii) true

(iii) true

(iv) false

Explanation:

(i) The ratio of Cp and Cv is not constant for all the gases. It is because the value of cp and Cv is different for monoatomic, diatomic and polyatomic gases.

So, this is false.

(ii) For monoatomic gas

Cp = 5R/2, Cv = 3R/2

So, thier ratio

Cp / Cv = 5 / 3 = 1.67

This statement is true.

(iii) for diatomic gases

Cp = 7R/2, Cv = 5R/2

Cp / Cv = 7 / 5 = 1.4

This statement is true.

(iv) It is false.

6 0
4 years ago
A person on a daily diet of 2,500 calories should get no_more than <br> calories from fat each day.
ivann1987 [24]

Answer:

35%

Explanation:

3 0
3 years ago
Read 2 more answers
A force of 8.0 N is along x direction, another force of 6.0 N is along +y direction. If both forces are acting on a point object
Darya [45]

Answer:

Resultant force, R = 10 N

Explanation:

It is given that,

Force acting along +x direction, F_x=8\ N

Force acting along +y direction, F_y=6\ N

Both the forces are acting on a point object located at the origin. Let the resultant force of the object is given by R. So,

R=\sqrt{F_x^2+F_y^2+F_xF_y\ cos\theta}

Here \theta=90^{\circ}

R=\sqrt{F_x^2+F_y^2}

R=\sqrt{8^2+6^2}

R = 10 N

So, the resultant force on the object is 10 N. Hence, this is the required solution.

6 0
3 years ago
When an average force F is exerted over a certain distance on a shopping cart of mass m, its kinetic energy increases by 12mv2.
VMariaS [17]

Answer:

A)d=\dfrac{1}{2F}mv^2

B)\Delta KE'=2\times \dfrac{1}{2}mv^2

Explanation:

Given that

Force  = F

Increase in Kinetic energy = \dfrac{1}{2}mv^2

\Delta KE=\dfrac{1}{2}mv^2

we know that

Work done by all the forces =change in the kinetic energy

a)

Lets distance = d

We know work done by force F

W= F .d

F.d=ΔKE

F.d=\dfrac{1}{2}mv^2

d=\dfrac{1}{2F}mv^2

b)

If the force become twice

F' = 2 F

F'.d=ΔKE'

2 F .d = ΔKE'                          ( F.d =Δ KE)

2ΔKE = ΔKE'

\Delta KE'=2\times \dfrac{1}{2}mv^2

Therefore the final kinetic energy will become the twice if the force become twice.

8 0
4 years ago
Other questions:
  • A rogue band of colonists on the moon declares war and prepares to use a catapult to launch large boulders at the earth. Assume
    7·1 answer
  • A sailboat of mass m is moving with a momentum p. how would you represent its kinetic energy in terms of these two quantities?
    13·1 answer
  • Your spaceship lands on an unknown planet. to determine the characteristics of this planet, you drop a 1.50 kg wrench from 5.50
    12·2 answers
  • 3.4.3 Quiz: Buoyancy
    8·1 answer
  • Suppose a skydiver jumps out of a plane at 15,000 meters above the ground. It takes him 2.0 seconds to pull the cord to deploy t
    8·1 answer
  • The speed of a bullet of mass 20 g is 216 kilometre-per-hour what is kinetic energy in joules​
    13·1 answer
  • Newton believed he knew the physical cause of gravity. True or False?
    7·1 answer
  • Question 1 of 25
    7·2 answers
  • AP physics here! Please help me answer only this question and then explain how you got your answer. After that, I will do the re
    7·1 answer
  • A. How much work is done by a man standing with a load of 100 kg?ANS=0​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!