Which of the following could be used to convert chemical energy to heat energy?
a. a chair sitting still
c. a leaf absorbing sunlight
b. a battery powering a flashlight d. a rock hitting the ground
Answer:
C
Explanation:
Inside a battery there are chemical reactions. When the battery is powering a flashlight, this chemical energy gives a heat one.
A certain light bulb consumes 200J of electrical energy per second, but only emits 25J of light energy per second. Calculate the efficiency of this bulb.
Answer:
The answer is 12.5%
Explanation:
The efficiency of a light bulb is:
Light energy comes out of the bulb / Electrical energy that was put in
= 25J / 200J = 12.5%
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Which type of mirror curves outward?
Which type of mirror always has an image that is smaller than the object?
Which type of mirror is used to focus light rays?
Which type of mirror has a flat surface?
Explanation:
1. Convex mirror is curved outward.
2. Convex mirror forms an image that is smaller than the object.
3. Concave mirror is used to focus light rays. That's why it is also known as a converging mirror.
4. Plane mirror has a flat surface. It forms the same size of the image as that of the object.
The reflective surface of a convex mirror, also known as a curved mirror, bulges toward the light source.
Thus, A curved mirror's surface can be convex, meaning it bulges outward, or concave, meaning it bulges inward. Since a convex mirror reflects light outward, it cannot be utilized to concentrate light.
Because the focus and center of curvature are fictitious positions inside the mirror and are therefore unreachable, convex mirrors or curved mirrors always produce a virtual image.
As a result, convex mirror images cannot be projected onto a screen. The picture is also smaller than the projected object, but it grows larger as it goes closer to the convex mirror.
Thus, The reflective surface of a convex mirror, also known as a curved mirror, bulges toward the light source.
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Contrast electron movement within conductors and insulators.
Answer:
Electrons surrounding a nucleus are attracted to the protons within it because electrons and protons have opposite charges. Electrons closest to the nucleus are attracted with such a force that they can’t escape from the atom. These electrons tend to shield the protons from electrons that are farther away because electrons have the same charge and repel each other. Electrons that are farther away have less attraction to the protons within the nucleus and are more likely to be detached from the atom.
Electrons can be transferred from atoms of one body to atoms of another body through friction. This can occur when one body is rubbed against another or when a liquid flows across a solid. In either case, one body may be given a positive charge while the other body is given a negative charge of the same magnitude. Both charges are developed at the same time. Electrons can also be transferred from one body to another when a charged body comes into contact with an uncharged body. The electrons move in the direction that will equalize the charges; thus, the uncharged body will be given the same charge as the charged body.
Free electrons move from points of negative charge to points of positive charge. When these electrons move freely from one point to another with little resistance, the material they’re traveling through is said to be a conductor. Conductors have a large number of free electrons. Insulators, on the other hand, have very few free electrons and offer great resistance to the movement of these electrons. Electric charges produced on one end of a body composed of insulating materials will most likely not spread throughout the body. In a conductor, this charge would spread throughout the entire body. Metals are generally conductors; oils, rubber, air, porcelain, and plastics are good insulators.
Lightning is produced by the rapid transfer of free electrons when one of the following conditions exist:
One part of a cloud is positively charged and a neighboring part of the same cloud is negatively charged.
A positively charged cloud comes near a negatively charged cloud.
A cloud with either a positive charge or a negative charge comes near the earth.
Explanation:
Free electrons are abundant in conductors. Conversely, insulators provide a high level of barrier to the movement of these free electrons, since they have some of them. In a body made of insulating materials, electric charges generated on one end are likely to remain localized there.
What are conductors?Electrons can move freely between particles when they are in conductors, which are substances. The charge can be transported across the whole surface of an object constructed of a conducting substance.
Because distant electrons have the same charge as these nearby ones and resist one another, these electrons usually act as a shield for protons. Further distant, electrons are less attracted to the nucleus's protons and are therefore more prone to break away from the atom.
Free electrons migrate from negatively charged to positively charged locations. The substance these electrons are passing through is referred to as a conductor when it allows them to go easily from one location to another with little resistance. Electrons are abundantly free in conductors.
A body made of insulating materials will likely not conduct electricity when it generates charges on one end. This charge would permeate the entire body of a conductor. Oils, rubber, air, porcelain, and plastics are effective insulators while metals are typically conductors.
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I need help with this question I added an image so y’all can see !
Answer:
a) .66
Explanation:
from (0,4) to (3,6)
the slope would be
[tex] \frac{2}{3} [/tex]
when diving the fraction the half slope is .66666...
A TV set shoots out a beam of electrons. The beam current is 10A. How many electrons strike the TV screen in a minute.
Answer:
600 mC
Explanation:
The charge of an electron is 1.6 x 10-19C so for a current with 10 mA, the charge going to screen in one second is 10 mC
so number of electrons, n = (10 x 10-3)/(1.6 x 10-19) = 6.25 x 1016 so in a minute the charge is 10 * 60 = 600 mC
Answer:
Total charge, q = It = 10 A x 60 s = 600 C
We know that, q = ne
So no. of electrons, n = q/e = 600 / (1.6×10-19) = 375x1019
When an object is fully magnetized, all of its magnetic domains will be ?
Answer:
magnetically saturated
Explanation:
When all of the domains are aligned, the material is said to be magnetically saturated. When a material is magnetically saturated, no additional amount of external magnetization force will cause an increase in its internal level of magnetization.
hope this helps u :)
if a source of sound waves is rabidly approaching a person the sound heard by the person appears to have?
Answer:
have a frequency. higher than the frequency actually produced by the source.
Explanation:
Answer:
If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have - a pitch lower than the original pitch.
In the diagram, q1= +8.0 C, q2= +3.5 C, and q3 = -2.5 C. q1 to q2 is 0.10 m, q2 to q3 is 0.15 m. What is the net force on q2? Label sign for charges (+ or -). (Unit = N). pls help?
Answer:
f(t) = 28,7 [N]
Explanation: IMPORTANT NOTE: IN PROBLEM STATEMENT CHARGES ARE IN C (COULOMBS) AND IN THE DIAGRAM IN μC. WE ASSUME CHARGES ARE IN μC.
The net force on +q₂ is the sum of the force of +q₁ on +q₂ ( is a repulsion force since charges of equal sign repel each other ) and the force of -q₃ on +q₂ ( is an attraction force, opposite sign charges attract each other)
The two forces have the same direction to the right of charge q₂, we have to add them
Then
f(t) = f₁₂ + f₃₂
f₁₂ = K * ( q₁*q₂ ) / (0,1)²
q₁ = + 8 μC then q₁ = 8*10⁻⁶ C
q₂ = + 3,5 μC then q₂ = 3,5 *10⁻⁶ C
K = 9*10⁹ [ N*m² /C²]
f₁₂ = 9*10⁹ * 8*3,5*10⁻¹²/ 1*10⁻² [ N*m² /C²]* C*C/m²
f₁₂ = 252*10⁻¹ [N]
f₁₂ = 25,2 [N]
f₃₂ = 9*10⁹*3,5*10⁻⁶*2,5*10⁻⁶ /(0,15)²
f₃₂ = 78,75*10⁻³/ 2,25*10⁻²
f₃₂ = 35 *10⁻¹
f₃₂ = 3,5 [N]
f(t) = 28,7 [N]
Answer:
facts
Explanation:
In the diagram, q1 = +6.60*10^-9 C and q2 = +3.10*10^-9 C. Find the magnitude of the total electric field at point P. pls help?
Answer:
|E(t)| = 1258,46 [N/C]
α = 67,5⁰ (angle with respect x-axis)
Explanation:
E(t) Electric Field is a vector, so we need to determine module and direction
E(t) = E(q₁) + E (q₂) Where E(q₁) and E (q₂) are electric fields due to electric charge q₁ and q₂ respectively.
E(q₁) = K * q₁/ (d₁)² K = 9 *10⁹ [N*m²/C²] d₁ = 0,350 m
E(q₁) = 9 *10⁹ * 6,6*10⁻⁹ / 0,1225 [N*m²/C²] *C/m²
E(q₁) = 484,9 [N/C]
E(q₂) = 9 *10⁹ * 3,1*10⁻⁹ / 0,024025
E(q₂) = 1161,29
Then
|E(t)| = √ |Eq₁|² + |Eq₂|²
|E(t)| = √ ( 484,9)² +( 1161,29)²
|E(t)| = √ 235128 + 1348594,46
|E(t)| = 1258,46 [N/C]
And tanα = 1161,29/484,9 tanα = 2,395 α = 67,5⁰
The angle of the vector electric field with the x-axis
Answer:
1258.46 N/C
Explanation:
acellus
When a cup of water, held upright, is dropped on the moon, the air makes the
cup fall faster than the water.
O A. True
B. False
Answer:
False
Explanation:
They both posses constant acceleration
B - False
hope this helps
At what distance from the centre of the earth its acceleration due to gravity becomes one third only? [Mass and radius of earth = 6x10 24 kg & 6.4x10 6 m resp.]
Answer:
235
Explanation:
3. There are twice as many people in the household, but your income has also doubled. Is your new
tax liability about twice as much as when you were single, more than twice as much, or less than
twice as much? Tell whether you think this difference-or the lack of one-seems fair.
Answer:
The answer is less than twice as much.
Explanation:
When the income doubles, the personal tax liability also doubles. However, because I have more dependents on my household, I'm able to get tax reductions to take care of the dependents.
What is a healthy way to cope with distress
How many millimeters are 120 meters ? Help ! Please <3
PLS HELP. I WILL MARK U THE BRAINLIEST IF U ANSWER EVERYTHING STEP BY STEP AND CORRECTLY.
distance is the length of his trip so 15( 3+4+8)
displacement is how far he is from his original point ( -5)( -4^2 + 3^2 = 5^2) he was displaced 5 meters from his start position
Guys I really need help with this question ): can someone give me the answer to this thanks
Answer:
the answer is
D) -1.5
Explanation:
[tex] \frac{ - 1.5}{1} [/tex]
move -1.5 down
then 1 right
What percent of the gross domestic product (GDP) is currently generated by the service industry?
68 percent
71 percent
82 percent
95 percent
The global economy is heavily reliant on the service sector, which accounts for more than two-thirds of global GDP, over three-quarters of foreign direct investment in advanced nations, the majority of worker employment, and the majority of job growth. Thus, option B is correct.
What GDP is generated by the service industry?The service sector, often known as the tertiary sector, makes up the third tier of the three-sector economy. Instead of creating products, this sector provides training, consulting, and maintenance and repairs.
The GDP of the nation is significantly impacted by the service sector. Through trade in services, it not only generates many jobs, but also significantly improves the country's economic performance.
Therefore, 70% of GDP is made up of consumer expenditure. The retail and service sectors are important to the American economy.
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What type of relationship exists between the length of a wire and the resistance, if all other factors remain the same?
OA.
Resistance is directly related to length.
OB.
Resistance is directly related to the square of the length.
O c. Resistance is inversely related to the length.
OD.
Resistance is inversely related to the square of the length.
Answer:
It is proportional or directly related....
HOPE YOU RATE THE ANSWER..Which statement is true of the electric field at a distance from the source charge?
O A. It is independent of the source charge.
OB. It is directly proportional to the source charge.
OC.
It is inversely proportional to the source charge.
OD.
It is directly proportional to the distance.
Answer:
the correct answer is B. it is directly proportional to the source charge.
Answer:
B is the correct answer.
HELP PLSSSSSSS ASAP FIRST CORRECT ANSWER WILL GET BRANLIST. A bunny accidentally knocks a basket of eggs off of a table. Luckily the basket lands safely on the floor with all the eggs unbroken. Air resistance is negligible. What is the acceleration of the egg-basket system in midair? A)The acceleration cannot be determined without knowing how hard the basket was pushed. B) Acceleration is downward and less than g because the eggs are light. C) The acceleration fluctuates because of the rolling of the eggs. D) Acceleration is downward with a magnitude of g because the system is a projectile.
Answer: i think is C
Explanation:
Because eggs do not have a good weight and the basket swings because not all eggs weigh the same there are small and large in the basket
I think it's this good luck :)
Answer:
Acceleration is downward with a magnitude of g because the system is a projectile.
Explanation:
There are traits like blood type and eye color, and others like speaking English or having a scar. What are the terms used to describe these different types of traits? How are each defined?
PLEASE ONLY ANSWER IF YOU KNOW
WILL GIVE BRAINLEIST
depending on Genetics the father genes depend on everything because they give most of the heredity and genetics to the child more than the mother does
How many milligrams in 1 gram. ??? HELP !!!
PLS HELP. WILL MARK AS THE BRAINLIEST. PLS ANSWER STEP BY STEP.
Answer:12
Explanation:
its the way u read it
What kind of information would be published in the Occupational Outlook Handbook (OOH)?
training guides for a chosen field
religious demographics of workers in a chosen field
current job openings in a chosen field
prospects for growth in a chosen field
Answer:
Explanation:growth of field is according chatestrophic reactions in physics due to radiation of sun
fill in the term to complete each sentence
a wave carries___ from one place to another.
mechanical waves carry energy through___.
Energy
A material medium
A wave carries energy from one place to another. Mechanical waves carry energy through a material medium.
What is a wave?A wave is a phenomenon that flows across a material medium without leaving any lasting mark.
Mechanical or electromagnetic waves can be used to classify them. Transverse and longitudinal are the two main forms.
A wave carries energy from one place to another. Mechanical waves carry energy through a material medium.
Hence the correct options for the fill-in-the-blanks are energy and a material medium.
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How many kilograms are in 2.5 grams ?
Answer:
0.0025 kilograms
Explanation:
There are a 1000 grams in 1 kilogram, so that means that there are
0.0025 kilograms in 2.5 grams.
Answer:
Below
Explanation:
● 1 kg = 1000 g
Divide both sides by 1000
● 1/1000 kg = 1000/1000 g
● 0.001 kg = 1 g
Multiply both sides by 2.5
● 2.5 g = 0.001 × 2.5 kg
● 2.5 g = 2.5 × 10^(-3) kg
● 2.5 g = 0. 00 25 kg
If the cross-sectional area of a wire is decreased while all other factors remain the same, how will the resistance change?
OA
It will increase
OB.
It will decrease.
OC. It will go to zero.
OD
The cross-sectional area does not affect the resistance.
Answer:
The answer is OA it will increase.
Explanation:
When an object is fully magnetized, all of its magnetic domains will be ?
A
Facing random directions,
B
Facing opposite directions, split down the middle of the object.
С
Facing opposite directions every-other domain
D
All facing the same direction.
Johnathan wants to lift a 200N box onto a 5m ledge. How much work is done?
a. 1000 J
b. 40 J
c. 0.025 J
d. 195 J
Answer:
1000 J which agrees with answer a in your list of options
Explanation:
Recall the formula for work (W) as the force (F) applied times the distance (d) covered in the same direction of the force:
W = F * d
W = 200 N * 5 m = 1000 J
