Increasing temperature increases light bulb resistance. Christmas tree light bulbs are connected in parallel for continuous illumination. Using a 100 Ohm resistor and a power supply below 8V can cause dim or no illumination due to high total resistance.
The temperature of a light bulb affects its resistance. As the temperature increases, the resistance of the bulb also increases. This phenomenon is known as positive temperature coefficient of resistance. The resistance change is primarily due to the behavior of the filament inside the bulb. When the bulb is turned on, the filament heats up and its temperature rises. As the temperature increases, the atoms in the filament vibrate more vigorously, which leads to increased collisions and hindered electron flow, thus increasing resistance. This temperature-resistance relationship has implications for the current flowing through the bulb and its overall brightness.
Christmas tree light bulbs are connected in parallel for practical reasons. By connecting the bulbs in parallel, each bulb has its own individual circuit connection. This setup allows independent operation of each bulb, meaning that if one bulb fails or burns out, the others can continue to function. In a parallel circuit, the voltage across each bulb remains the same, ensuring consistent brightness across the entire string of lights. Additionally, parallel connection offers convenience when replacing or removing bulbs, as it does not disrupt the circuit for the remaining bulbs. If the bulbs were connected in series, the failure of one bulb would break the circuit, resulting in the whole string going dark.
When a light bulb is connected in series with a 100 Ohm resistor and connected to a power supply, the bulb may not light up or may appear dim. The presence of the resistor in series increases the total resistance in the circuit, limiting the current flowing through it. The voltage across the circuit is shared between the bulb and the resistor, reducing the voltage available to power the bulb. As a result, the bulb may not receive enough current to emit sufficient light. To ensure the bulb lights up brightly, the resistor value should be lower or eliminated, allowing more current to flow through the circuit and reach the bulb.
Learn more about resistance here:
brainly.com/question/32301085
#SPJ11
12. A train is traveling away from you at a constant speed.
What would a distance-time graph look like for this train?
Answer:
b
Explanation:because think about it its going straight so you have to coiunt the miles the train is going and boom your answer is b
Answer:
It would be choice b
Explanation:
speed is constant so they value won't change, on the other hand time is always going.
What is the force that causes you t land on the floor when you fall out of bed?
Answer: gravity.
Explanation:
Answer:gravity
Explanation:
Use the information below to solve this problem: A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters. Question 2 options: 0.6945 m 0.7204 m 1.439 m 343 m
Answer:
Option (1). 0.6945 m
Explanation:
Frequency of a B note = 493.88 Hz
Speed of sound in the air = 343 meters per second
Since, formula to calculate the wavelength of a note is,
λ = [tex]\frac{v}{f}[/tex]
By substituting the given values in the formula,
λ = [tex]\frac{343}{493.88}[/tex]
λ = 0.6945 m
Therefore, wavelength of the music note is 0.6945 m.
Option (1) will be the answer.
Two swimmers relax close together on air mattresses in a pool. One swimmer’s mass is 48 kg, and the other’s mass is 55 kg. If the swimmers push away from each other,
A. their total momentum triples.
B. their momentums are equal but opposite.
C. their total momentum doubles.
D. their total momentum decreases.
In the case when the swimmer push away so the momentum should be equal but it should be opposite.
What is momentum?Momentum means the product of the mass of a particle and its velocity. It is a vector quantity, it applied to both magnitude and direction. Since the swimmers are push away so here the momentum should be equal but it should be an inverse direction, not the direct direction.
learn more about momentum here: https://brainly.com/question/24717686
which statement is an example of the law of conservation of energy
Answer:
The law of conservation of energy can be seen in these everyday examples of energy transference: Water can produce electricity. Water falls from the sky, converting potential energy to kinetic energy. This energy is then used to rotate the turbine of a generator to produce electricity.
Explanation:
Answer:
When a light bulb is turned on, electrical energy is converted to light and heat.
Explanation:
got it right :)
State Newton’s first law of motion in your own words.
Answer:
An object in motion will stay in motion until an outside force is acted upon it.An object at rest will stay at rest until an outside force acts upon it.
Explanation:
Answer:
An object in motion will stay in motion until an outside force is acted upon it. An object at rest will stay at rest until an outside force acts upon it.
Explanation:
I really need help with this question, I can't wrap my brain around this.
region 4: warm, low pressure air
region 1: higher pressure air fills vacancy from low pressure air
region 3; cool high pressure air
region 2: warm air cools and increases in pressure.
difference between
Atmospheric pressure and Liquid pressure.
Answer:
one is Atmospheric and one is a Liquid
Explanation:
PLEASE HELP ME WILL GIVE BRAINLIEST
The horizontal and vertical components of a projectile's velocity are......
A. always changing
B. independent of each other
C. dependent on each other
D. always equal
Answer:
A.always changing
Explanation:
Answer:
always equal
The horizontal and vertical components of a projectile's velocity is always equal. The horizontal and vertical have different charges.
please help me with this question asap
if Sarah melts 10g of tin. What mass of melted tin would she have at the end of the experiment?
Answer:
10g
Explanation:
As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".
Though melting of tin isn't a chemical change, the same logic is applied here...
Hence,
The mass of tin will be 10 g itself...
Answer:
10g
Explanation:
The experiment is about melting of tin. When solid tin is melted, it retains the amount of substance it originally has and we expect it to still be 10g.
Mass is the quantity or amount of matter contained in a substance. For most chemical processes, the law of conservation of matter is always succinctly observed.
The law states that "matter is neither created nor destroyed in a chemical reaction or process". Although melting is a phase change, we can adapt this law to the process. Owning to no loss of matter in the melting procedure, the amount of substance remains the same.
Therefore, we are left with about the same mass of substance we started with which is 10g.
An object moves in a straight path. Its position x as a function of time t is presented by the equation x(t) = at – bt2+c, where a = 1.4 m/s, b = 0.06 m/s2 and c =50 m. a. Calculate the average velocity of the object for the time interval t = 0 to t = 5 s b. Calculate the average velocity of the object for the time interval t = 0 to t = 10 s c. Calculate the average velocity of the object for the time interval t = 10 to t = 15 s
Answer:
The answer is below
Explanation:
Given that:
x(t) = at – bt2+c
a) x(t) = at – bt2+c
Substituting a = 1.4 m/s, b = 0.06 m/s2 and c =50 m gives:
x(t) = 1.4t - 0.06t² + 50
At t = 5, x(5) = 1.4(5) - 0.06(5)² + 50 = 55.5 m
At t = 0, x(0) = 1.4(0) - 0.06(0)² + 50 = 50 m
The average velocity (v) is given as:
[tex]v=\frac{x(5)-x(0)}{5-0}\\ \\v=\frac{55.5-50}{5-0}=1.1\\ \\v=1.1\ m/s[/tex]
b) x(t) = 1.4t - 0.06t² + 50
At t = 10, x(10) = 1.4(10) - 0.06(10)² + 50 = 58 m
At t = 0, x(0) = 1.4(0) - 0.06(0)² + 50 = 50 m
The average velocity (v) is given as:
[tex]v=\frac{x(10)-x(0)}{10-0}\\ \\v=\frac{58-50}{10-0}=0.8\\ \\v=0.8\ m/s[/tex]
c) x(t) = 1.4t - 0.06t² + 50
At t = 15, x(5) = 1.4(15) - 0.06(15)² + 50 = 57.5 m
At t = 10, x(10) = 1.4(10) - 0.06(10)² + 50 = 58 m
The average velocity (v) is given as:
[tex]v=\frac{x(15)-x(10)}{15-10}\\ \\v=\frac{57.5-58}{15-10}=0.1\\ \\v=0.1\ m/s[/tex]
The point on the graph that lies on the y-axis (vertical axis) is called the y-intercept. What does the y-intercept tell you about the runner? ( look at photo)
the ending position of the runner
Choices:
the runners distance from the state
the starting position of the runner
the runners speed
Answer:
The starting position of the runner.
Explanation:
When you look at the graph, you can see that the first point on the graph is twenty on the y-axis.
The runner starts at twenty, and ends at thirty.
Therefore, the runner starts at twenty on the y-axis, so it's the starting position of the runner.
The y-intercept tell you about the starting position of the runner.
What is y-intercept of a function?The intersection of the graph of the function with the y-axis gives y-intercept of that function. The y-intercept is the value of y on the y-axis at which the considered function intersects it.
Assume that we've got: y = f(x)
At y-axis, we've got x = 0, so putting it will give us the y-intercept.
Thus, y-intercept of y = f(x) is y = f(0)
When we look at the graph, we can see that the first point on the graph is twenty on the y-axis.
The runner starts at twenty and ends at thirty.
Thus, the runner starts at twenty on the y-axis, so it is the starting position of the runner.
The y-intercept tell you about the starting position of the runner.
Learn more about y-intercept here:
https://brainly.com/question/16540065
#SPJ2
A 100 kg steel beam is being lifted by a crane to the top of 15 meter building. How much Potential Energy is in the steel be a m when it reaches the top of the building.
x = 20
v = 3.5 m/s
t = ?
Answer:
16.5 I think
Explanation:
PLEASE HURRY AND HELP
What is the correct unit for acceleration?
A. m
B. m/s
C. m/s2
In a complete description of a force vector, which is usually not necessary?
Answer:
Position
Explanation:
A force vector has both magnitude and direction, which can be represented by a line with an arrow head. The length of the line describes magnitude, while the arrows points in the required direction.
generally, the position of a vector is unimportant when describing the vector. Thus, when a force vector is to be described, it is unnecessary to make reference to its original position. Majorly, its magnitude and direction is considered.
The temperature of a sample of iron with a mass of 10.0 g changed
from 50.4°C to 25.0°C with the release of 114.3 J of heat. What is the
specific heat of iron
Answer:
Q = mc(θ₂-θ₁)
47 calories = 10 g *c*(50.4 - 25)
47cal = 10*c* 25.4
47 /(10*25.4) = c
0.185 = c
Specific heat of iron = 0.185 cal/g°C
Explanation:
a body at rest in one reference frame may be in motion in another reference frame what does it mean?
Answer:
Explanation:
Suppose you are standing on a platform connected to a train station. You appear to be at rest to a third person looking at you from the parking lot.
But what happens if you are observed by someone in the dining car of the train that just passed you?
You appear to be moving. He can prove it because your relative size is getting smaller. How does he know that it is he that is moving and that you are standing still? If he has no idea what's going on with his motion, he also has no idea who is moving.
Does the kinetic energy of an object depend on its gravitational potential energy? use evidence to explain your answer.
Answer:
Short answer: No
Explanation:
Long answer: Kinetic energy is the amount of energy in a moving object. Gravitational potential energy is the energy in an object because of the object's position in the gravitational field.
Imagine a car travelling along a road. There is a wall at one end of the road and car collides with this wall. The energy released when the car collides with the wall is the kinetic energy of the moving car. To have kinetic energy an object must have velocity. The equation for the kinetic energy of a moving object is
K.E = [tex]\frac{1}{2} mv^{2}[/tex] , where m is the mass of the object and v is velocity. So, if velocity is zero (i.e. the object isn't moving), K.E = 0.
Now, imagine a car falling from a plane which is flying at a height of 300 metres from the ground. The energy the car possesses at a height of 300m is its gravitational potential energy. This is the energy which causes the falling car to move toward the ground in the first place.
You might think that as the car moves towards the ground, it has velocity since it's moving. Well, yes; the car does have kinetic energy, but only when it starts moving; the car does not have any kinetic energy when it's on the cargo hold of the plane. It is the gravitational potential energy of the car which causes an increase in kinetic energy. The equation for gravitational potential energy is:
[tex]G.P.E = mgh[/tex] , where m= mass of the object, g is the gravitational field strength (i.e 10N/kg) and h is the height of the object from the ground. So, imagine if the car parked on the ground, its gravitational potential energy would be zero, and if gravitational potential energy is zero, then there will be no force to cause the car to start moving and gain kinetic energy.
In this sense, you might say that the kinetic energy of the object does depend on its gravitational potential energy, but remember, in the first example, the car was not moving downwards; it was moving horizontally. So gravitational potential energy only affects kinetic energy downwards, but kinetic energy can be in any direction.
And hence, gravitational potential energy does not affect kinetic energy.
Processes such as dissolving, melting, freezing, and evaporationg can affect the appearance of a substance, but the identity of the substance remains the same. These processes are called
A. physical properties
B. chemical change
C. chemical process
D. physical change
During an ,
experiment, a siginal from a spaceship
reached the ground station in five minutes. What was the
distance of
the spaceship from
the ground station? The
signal travels at the speed of light, that is 3x 109 ms‐1
Answer:
1.5*10^9
Explanation:
distance =V x T
=3x10^8x5
=1.5*10^9
A handball is hit toward a wall with a velocity of 14.3 m/s in the forward direction. It returns with a velocity of 13.5 m/s in the backward direction. If the time interval during which the ball is accelerated is 0.011 s, what is the handball's average acceleration?
Answer:
Let's define t = 0 as the moment when the ball hits the wall.
in this moment, we have a given acceleration, but if we only want to calculate the average acceleration, then let's consider the acceleration constant.
a(t) = A.
To find the velocity equation we should integrate, and the constant of integration will be the initial velocity, in this case, is 14.3m/s.
v(t) = A*t + 14.3m/s
Now we know that at t = 0.011s, the velocity is -13.5m/s (the sign is negative because the ball is moving in the opposite direction as before).
Then we can solve the equation:
v(0.011s) = -13.5m/s = A*0.011s + 14.3m/s
Now we can solve it for A, the average acceleration:
-13.5m/s - 14.3m/s = A*0.011s
(-27.8m/s)/0.011s = A = -1313.5 m/s^2
PLEASE HELP!!!!! 30 POINTS!!!!! I HAVE NO IDEA HOW TO DO THIS!!
Match these items and the phrases with which they are associated.
1. upward force of a liquid on an object
2. H 2 O
3. basic unit of matter
4. amount of matter in an object
5. n = 1
6. l × w × h
7. drew first picture of atom
8. mass/volume
mass,
atom,
water,
buoyancy,
inner shell,
volume,
density,
Neils Bohr,
concrete
as a car skids to a stop, friction transforms kinetic energy to
Answer:
potential energy
Explanation:
Which of the following was/were used by the Greek philosophers in
order to understand the world?
a Observation
b Experiment
C Reason
d All of the above
Need help
Answer:
a and c are both correct
Explanation:
The Greek Philosophers had to reject many existing explanations (mostly from the babylonians and the egyptians) because of possible religion bias. They resorted to logic and reason to provide understanding for the world around them. The first set of Greek Philosophers were the Milesian thinkers; whom aside from logic and reason also placed value on Observation in understanding the world.
There are generally no evidence to support the use of experiment to support the claims of the Greek philosophers
The answer is reason C (reason).
please help!!
There are more electrons in the orbitals of an atom that there are protons in the nucleus of the atom true or false
Answer:
An element is a pure substance that contains only one type of atom. TRUE. 2. ... FALSE, they are all carbon atoms. 7. The smallest unit of matter is an atom. TRUE. 8. When an ... TRUE. 10. Most of the mass of an atom is found in the electron layers. FALSE. 11. The nucleus of an atom contains protons and neutrons. TRUE ...
Explanation:
What is the momentum of a baseball with a mass of 4 kg being thrown at a velocity of 84 m/s towards the hitter
Answer:
The answer is 336 kgm/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocityFrom the question
mass = 4 kg
velocity = 84 m/s
We have
momentum = 4 × 84
We have the final answer as
336 kgm/sHope this helps you
HELPPPP!!!!!
The air we breathe is a(n) _____.
A. compound
B. mixture
C. element
D. alloy
what is the properties of polarization
Answer:
Explanation:
The polarization characteristics depend on the shape, size, and optical properties of the surface particles. Generally, the radiation is linearly polarized and is said to be negatively polarized if it lies in the scattering plane and positively polarized if it is perpendicular to the scattering plane.
