Answer:
3. more resistance and draws more current
Explanation:
According to a derivation from Ohm's law, the power, P, generated by the bulb is directly proportional to square of the current, I, passing through it. i.e
P ∝ I²
P = I²R -------------------- (i)
Where;
R = constant of proportionality called resistance
From equation (i), it can thus be deduced that the power, P, is also directly proportional to the resistance, R.
Thus;
(i) When power increases, resistance increases
(ii) When power increases, current also increases.
So for the 100-watt bulb, compared to the 60-watt bulb, there will be more resistance and more current will be drawn.
Answer:
Option 1. Less resistance and draws more current
Explanation:
To better understand this concept, let us determine the resistance and current of each bulb assuming a 240V supply.
Recall:
Power = current (I) x voltage (V)
P = IV
Power = square voltage/ resistance
P = V^2 /R
For the 60watt bulb:
Power (P) = 60watts
Voltage = 240V
Current (I) =?
Resistance =?
A. P= IV
60 = I x 240
Divide both side by 240
I = 60/240
I = 0.25A
B. P = V^2 /R
60 = (240)^2 / R
Cross multiply to express in linear form
60 x R = (240)^2
Divide both side by 60
R = (240)^2 / 60
R = 960 ohms
For 100watts bulb:
Power (P) = 100watts
Voltage = 240V
Current (I) =?
Resistance =?
A. P= IV
100 = I x 240
Divide both side by 240
I = 100/240
I = 0.42A
B. P = V^2 /R
100 = (240)^2 / R
Cross multiply to express in linear form
100 x R = (240)^2
Divide both side by 100
R = (240)^2 / 100
R = 576 ohms
Summary:
60watts bulb has a current of 0.25A and a resistance of 960 ohms
100watts bulb has a current of 0.42A and a resistance of 576 ohms.
Comparing the resistance and current of the 60watts and 100watts bulb under the same supply of 240V,
the 100watts bulb has lesser resistance than the 60watts bulb and draws more current than the 60watts bulb.
a person run 21.0 km west then runs 10.0 km east what is the persons distance
Answer:
31.0 km
Explanation:
21.0+10.0=31.0 km
Answer:
Distance from starting point = 11 km, Distance ran altogether = 31 km
Explanation:
21 - 10 = 11
21 + 10 = 31
Which of the following are created by an arrangement of electric charges or a
current (the flow of electric charges)?
A. A gravitational field
B. A magnetic field
c. A quantum field
O
D. An electric field
GHIDMAT
Final answer:
An arrangement of electric charges or a current creates both an electric field and a magnetic field. Mass generates a gravitational field, not related to charges or currents, and a quantum field is more broadly conceptual and not directly created by charges or currents. So the correct options are B and D.
Explanation:
The arrangement of electric charges or a current, which is the flow of electric charges, creates both an electric field and a magnetic field. Mass produces a gravitational field but is unrelated to electric charges or current. While a quantum field is a more comprehensive concept that includes various types of fields at the quantum level, it is not directly created by just the arrangement of electric charges or current alone.
Electric fields are created around objects that have a net electric charge, and these fields exert forces on other charged objects. On the other hand, magnetic fields are specifically generated by moving charges (current) or changing electric fields as per Ampere's Law and Maxwell's equations. This phenomenon underlies many technologies, including electric motors and magnetic imaging, by utilizing the interaction between current and the magnetic field it produces.
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A student is helping his mom make sweet tea. She wants the tea to be very sweet and very strong. The student knows how to alter solutes so that they will dissolve better and faster.
Which of the following conditions would help make the sweet tea faster?
I. using sugar cubes with less surface area
II. using granulated sugar with greater surface area
III. using hot water
IV. using cold water
V. allowing to sit
V1. stirring vigorously
A. I, III, and VI
B. I, III, and V
C. II, III, and VI
D. I, IV, and V
Answer:
C
Explanation:
Greater surface area will allow the sugar to dissolve faster. Stirring and hot water will also help dissolve the sugar faster.
Answer:
D
Explanation:
stirring temperature small particle size
A toy consists of two identical spheres connected by a string with negligible mass. The toy is thrown at an angle above the horizontal such that the string remains taut and both sphere are revolving counterclockwise in a vertical plane around the center of the string.
when the toy was released, the center of the string was moving with an initial speed of 15m/s at a 60 degree angle above the horizontal. What is the speed of the center of the string at the instant when the string reaches the top of its trajectory?
Answer:
7.5 m/s
Explanation:
The center of the string is a single point following projectile motion. At the top of its trajectory, the vertical component of the velocity is 0 m/s. In the horizontal direction, assuming negligible air resistance, the acceleration is 0 m/s², so the horizontal velocity is the same as the x component of the initial velocity. Therefore, the net speed of the center of the string is equal to the initial horizontal component of the velocity.
v = vₓ = 15 m/s cos 60° = 7.5 m/s
At the top of the trajectory, the speed of the center of the string is the same as the initial horizontal velocity, which is 7.5 m/s. This is because the vertical component of the velocity becomes zero while the horizontal component remains unchanged. Thus, the speed of the center of the string is 7.5 m/s.
To determine the speed of the center of the string at the top of its trajectory, we need to consider the initial conditions and the influence of gravity on the projectile motion.
The toy is thrown with an initial speed of 15 m/s at an angle of 60 degrees above the horizontal. We can break this down into horizontal and vertical components:
Initial horizontal velocity: v_x = v_0 cos(θ) = 15 m/s x cos(60°) = 7.5 m/sInitial vertical velocity: v_y = v_0 sin(θ) = 15 m/s x sin(60°) ≈ 13 m/sAt the top of the trajectory, the vertical component of the velocity becomes zero since the toy momentarily stops moving upwards and is about to start descending. The horizontal component, however, remains unchanged as there is no horizontal acceleration acting on it (ignoring air resistance).
Therefore, at the top of the trajectory, the speed of the center of the string is the horizontal component of the initial velocity: 7.5 m/s.
What were the provisions of the 1973 Vietnam War cease-fire?
Check all of the boxes that apply.
The United States would return its prisoners of war.
The United States would allow South Vietnam to decide its own future.
Communist forces would return their prisoners of war.
The United States would keep troops in Vietnam.
Communist forces would not send more soldiers to South Vietnam,
Answer:
BCE
Explanation:
The provisions of the 1973 Vietnam War cease-fire are
The United States would allow South Vietnam to decide its own future.Communist forces would return their prisoners of war.Communist forces would not send more soldiers to South Vietnam.What is Vietnam located?Vietnam is a country located in the southeast Asian region on the Indochinese peninsula. It was under french colonial rule rule since 19th century.
Given are the provisions of the 1973 Vietnam War cease-fire.
The provisions of the 1973 Vietnam War cease-fire are
The United States would allow South Vietnam to decide its own future.Communist forces would return their prisoners of war.Communist forces would not send more soldiers to South Vietnam.Therefore, the provisions of the 1973 Vietnam War cease-fire are
The United States would allow South Vietnam to decide its own future.Communist forces would return their prisoners of war.Communist forces would not send more soldiers to South Vietnam.To solve more questions on Vietnamese war, visit the link below -
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find the unit of length,mass and time if the unit of force, velocity and energy are respectively 100N,10ms^1and 500J
Answer:
Mass = 5 unit
Length = 5 unit
Time = 0.5 unit
Explanation:
As we know that the units are as following
Force = 100 N
Velocity = 10 m/s
Energy = 500 J
i) For mass we know that
[tex]Force = mass \times \frac{velocity}{time}[/tex]
[tex]100 = mass \times \frac{10}{0.5}[/tex]
[tex]mass = 5 units[/tex]
ii) For length we know that
[tex]Force \times distance = energy/work[/tex]
[tex]100 (d) = 500[/tex]
[tex]Length = 5 units[/tex]
iii) for Time we know that
[tex]Power = \frac{Energy}{time}[/tex]
[tex]Force \times velocity = \frac{Energy}{time}[/tex]
[tex]time = \frac{500}{100\times 10}[/tex]
[tex]Time = 0.5 unit[/tex]
What are the products in the photosynthesis equation?
A) 02 and energy
B) CO2 and 02
C) Glucose and 02
D) 02 and sunlight
Answer:
C
Explanation:
A 5 cm object is 6 cm from a convex lens, which has a focal length of 7 cm. What is the distance of the image from the lens
Answer: -42 cm
Explanation: It explains after you answer
Answer:
Distance=: -42 cm
Height: 35 cm
Explanation:
Tells you on edg
why do substances with free electrons make the best conductors.
Answer:
when electrons move around they create heat. the freer the molecules the more hear they can produce
A cd player uses a ___ to convert info to an electrical signal
A. Neon light
B. Sodium vapor light
C. Laser
How are an engineer and a carpenter different
Answer:
engineers plan, carpenters do the manual work
Explanation:
engineers plan and sketch out the blueprint, while carpenters do the cutting, shaping and fastening of wood material, carpenters do the construction and repair
Answer:
The engineers do most of the planning and sketching of the plan, While a carpenter's job is to perform work entailing the cutting, shaping, and fastening of wood or material such as fiberboard that is treated as wood.
Explanation:
Carpenters perform the two principal jobs of construction and repair. Other then an engineer.
If it takes 520 joules of work to move an object 10 meters, what force was needed? A. 51 N B. 510 N C. 530 N D. 52 N
Answer:
52
Explanation:
W = F x s
520 = F x 10
F = 520 ÷ 10
The revolution period for Venus is___days.
121
225
156
212
(PLS ANSWER ASAP)
Answer:
225
Explanation:
The period of rotation of Venus is 243 Earth days, which is longer than the 225 days it takes the planet to orbit the sun. Moreover, the rotation is in the opposite direction from other planets in the solar system.
Answer:
225
Explanation:
A charged particle (q = 8.0 mC), which moves in a region where the only force acting on the particle is an electric force, is released from rest at point A. At point B the kinetic energy of the particle is equal to 4.8 J. What is the electric potential difference VB VA?
The potential difference will be 600 V.
Explanation:
Here the charged particle is said to exhibit a charge of -8 mC. So when it moves from point A to point B, it gains a kinetic energy of 4.8 J. Also, the charged particle is said to exhibit an electrostatic potential energy at points A and B.
The particle will obey conservation of energy. So the sum of energy exhibited by the particle at point B will be equal to the sum of energy exhibited by the particle at point A.
At point A, the kinetic energy is zero and the electrostatic energy will be represented as U₁.
Then, the total energy at point A = U₁
Similarly, at point B, the charged particle will exhibit kinetic energy as well as electrostatic potential energy (U₂).
Total energy exhibited by the charged particles at point B = U₂ + K.E = U₂+4.8.
Then, as per law of conservation of energy:
[tex]U_{2} + 4.8 = U_{1} \\\\U_{1} -U_{2} = 4.8[/tex]
It is known that electrostatic potential energy is the product of charge with the potential at that point.
So, [tex]U_{1} = QV_{1}[/tex] and [tex]U_{2} = QV_{2}[/tex]
Then, [tex]Q (V_{1} - V_{2}) = 4.8\\ \\-8*10^{-3} (V_{1} - V_{2})=4.8\\\\(V_{1} - V_{2}) = \frac{4.8}{-8*10^{-3} } = -0.6*10^{3} = -600 V[/tex]
Then, V₂-V₁ will be 600 V.
Thus, the potential difference will be 600 V.
What charges must the particles have to create the electric field shown
Correct Option:
X shows positive while Y shows negative charges, create the electric field as shown.
Option: D
Explanation:
The idea of an electric field provides a way to define how starlight travels to enter our eyes across huge distances of empty space.The electric field is a quantity of vectors that is present at any point in space. The electric field at a region shows the force that, if put at that position, will operate upon a positive charge device.
The direction of the electric field points directly at a positive point charge, and straight at a negative point charge. The field direction is implemented to the force direction exert on a positive test charge. It is externally from a positive charge and radially in toward a negative point charge.
which parts of an electric generator are connected
Answer:
https://brainly.com/question/10256321
Answer:
the armature and commutator
Explanation:
A 2000 kg car has a speed of 23 mph at the top of a hill which is 144 m tall. How
fast will the car be going if it coasts to the bottom of the hill?
Answer:
Final speed, v = 54.64 m/s.
Explanation:
Given that,
Mass of a car, m = 2000 kg
Initial speed of the car, u = 23 mph = 10.28 m/s
height, h = 144 m
We need to find the speed of the car at the bottom of the hill. Let v is the speed. Applying conservation of energy as :
[tex]\dfrac{1}{2}mu^2+mgh=\dfrac{1}{2}mv^2\\\\v^2-u^2=2ah[/tex]
a = g here
[tex]v=\sqrt{2gh+u^2}\\\\v=\sqrt{2\times 10\times 144+(10.28)^2}\\\\v=54.64\ m/s[/tex]
So, the speed at the bottom of the hill is 54.64 m/s.
Using the principle of conservation of energy, the car will be going approximately 53.7 m/s when it reaches the bottom of the hill.
Explanation:The question basically involves the principle of conservation of energy. You need to equate the total energy at the top of the hill to the total energy at the bottom. The total energy at the top is the sum of kinetic and potential energies. The kinetic energy is 0.5* m * v^2, where m = 2000 kg (mass) and v = 23 mph = 10.3 m/s (velocity). The potential energy is m * g * h, where g = 9.8 m/s^2 (gravity) and h = 144 m (height). The total energy at the bottom is kinetic energy (since potential energy is 0), which is 0.5 * m * u^2 where u is the final velocity. Equating the energies and solving for u, we get u = sqrt(2*g*h + v^2) =~ 53.7 m/s.
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How are humans able to perceive light waves? Sound waves?
Answer:
Light that is visible to humans makes up only a small portion of the electromagnetic spectrum. In humans, light wavelength is associated with perception of color. The amplitude of light waves is associated with our experience of brightness or intensity of color, with larger amplitudes appearing brighter.
Explanation:
True or False? When vinegar is added to baking soda, the temperature decreases slightly. This is a sign that there was a chemical reaction.
Group of answer choices
True
False
Answer:
true
Explanation:
Answer:
this would be be true but of the ingredients in it.
A crane motor exerts 3,500.0 W to lift a load up 5 floors in 25.0 seconds. The crane did how much J of work.
Answer:
87,500 J
Explanation:
Power = energy / time
3,500.0 W = E / 25.0 s
E = 87,500 J
Betty made a simple electromagnet using just a battery and a wire. What could Betty do to increase the strength of her
electromagnet?
Answer:
Coil the wire around a nail.
Explanation:
If Betty wants to increase the strength of the electromagnet, she should coil the wire around an object that conducts electricity. Plastic, paper, and glass do not conduct electricity, so Betty should coil the wire around a nail.
Answer:
Coil the wire around a nail.
Assume that you are performing general maintenance on your bicycle using a black lubricant. When you lubricate the brake levers, what type of
fingerprints are you most likely to leave on them?
When lubricating the brake levers of a bicycle with a black lubricant, you are most likely to leave dark or smudged fingerprints on them. The black lubricant can transfer onto your fingers and when you touch the brake levers, it can leave visible marks that correspond to your fingerprints.
Fingerprints are typically formed by the natural oils and sweat on our skin, and lubricants like oil or grease can actually mask or reduce the visibility of fingerprints.
Therefore, if you are using a black lubricant on the brake levers, you would not leave distinct fingerprints on them. Instead, you may leave smudges or marks from the lubricant itself, which can be visible on the surface of the levers.
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A spoonful of oil has poor solubility in water. Would a cup of oil dissolve into water?
Answer:
No
Explanation:
The density of the oil is different from the density of the water.
A block is sitting on a platform 20 m high. It weighs 50 kg. How much potential energy does it contain?
Answer:
9806.65 Joules
Explanation:
The block sitting on a platform contains 9,800 Joules of potential energy.
Given the following data:
Height = 20 metersMass of block = 50 kgWe know that acceleration due to gravity (a) for an object is equal to 9.8 meter per seconds square.
To find how much potential energy the block contains:
Mathematically, potential energy (P.E) is calculated by using the following formula:
[tex]P.E = mgh[/tex]
Where:
m is the mass of object. g is the acceleration due to gravity. h is the height of an object.Substituting the given parameters into the formula, we have;
[tex]P.E = 50[/tex] × [tex]9.8[/tex] × [tex]20[/tex]
Potential energy = 9,800 Joules
Therefore, the block contains 9,800 Joules of potential energy.
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19. Find the recoil velocity of a 65 kg ice hockey goalie who
catches a 0.15 kg hockey puck slapped at him at a
velocity of 50 m/s. Assume that the goalie is at rest
before catching the puck, and friction between the ice
and the puck-goalie system is negligible.
a. -0.12 m/s
b. O m/s
C. 0.12 m/s
d. 7.5 m/s
Answer:
c. 0.12 m/s
Explanation:
by using momentum formula [tex]v_2=\frac{m_1\times v_1}{m_1+m_2}[/tex]
we get
[tex]v_2=\frac{0.15\times 50}{0.15+65}=0.12[/tex]
The recoils velocity of the puck-goalie system would be 0.12 meters/second, therefore the correct answer is option C.
What is momentum?It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
As given in the problem we have to find the recoil velocity of a 65 kg ice hockey goalie who catches a 0.15 kg hockey puck slapped at him at a velocity of 50 m/s. Assume that the goalie is at rest before catching the puck, and friction between the ice and the puck-goalie system is negligible.
By using the conservation of the momentum,
The velocity of the recoil = 0.15*50 / (0.15+65)
=0.12 meters / second
Thus, the recoil velocity of a 65 kg ice hockey goalie would be 0.12 meters /second, therefore the correct answer is option C.
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Sound waves are longitudinal waves. The height or intensity of the wave shows it's amplitude or the energy in the wave. In the diagram of a sound wave, the section labeled D shows the area of the sound wave with the
A) most amplitude and most compression.
B) most amplitude and most rarefaction.
C) least amplitude and most compression.
D) least amplitude and most rarefaction.
Answer:
most amplitude and compression .
Explanation:
Convection occurs when thermal energy is transferred by the movement of
Answer:
Convection is the transfer of thermal energy from one place to another by the movement of gas or liquid particles. How does this happen? As a gas or liquid is heated, the substance expands. This is because the particles in liquids and gases gain kinetic energy when they are heated and start to move faster.
Answer:
fluids
Explanation:
on edg 2021
7.
Which would take more force to stop in 10 seconds: an 8.0-kilogram ball rolling in a straight line at a speed
of 0.2 m/sec or a 4.0-kilogram ball rolling along the same path at a speed of 1.0 m/sec?
8.
The momentum of a car traveling in a straight line at 20 m/sec is 24,500 kg-m/sec. What is the car's mass?
9.
A 0.14-kilogram baseball is thrown in a straight line at a velocity of 30 m/sec. What is the momentum of the
baseball?
10. Another pitcher throws the same baseball in a straight line. Its momentum is 2.1 kg m/sec. What is the
velocity of the ball?
11. A 1-kilogram turtle crawls in a straight line at a speed of 0.01 m/sec. What is the turtle's momentum?
Plz help
Answer:
7. the ball with a mass of 8.0kg
8.1225 kg
9.4.2 kg-m/sec
10.15m/sec
11.0.001kgm/sec
Final answer:
The 4.0-kilogram ball requires more force to stop in 10 seconds. The car's mass is 1225 kg. The baseball's momentum is 4.2 kg-m/sec, and the turtle's momentum is 0.01 kg-m/sec.
Explanation:
To determine which ball requires more force to stop in 10 seconds, the momentum of each ball must be calculated. The force required to stop an object is related to the change in momentum and the time over which that change occurs (Force = change in momentum / time). The momentum of an object is the product of its mass and velocity (momentum = mass times velocity). So for the 8.0-kilogram ball, the momentum is 8.0 kg times 0.2 m/sec = 1.6 kg times m/sec. For the 4.0-kilogram ball, the momentum is 4.0 kg times 1.0 m/sec = 4.0 kg times m/sec. Therefore, the 4.0-kilogram ball would take more force to stop within the same time frame because it has a greater momentum.
The momentum of a car can be found by rearranging the momentum formula (momentum = mass times velocity) to solve for mass (mass = momentum / velocity). With a momentum of 24,500 kg times m/sec and a velocity of 20 m/sec, the car's mass is 24,500 kg times m/sec / 20 m/sec = 1225 kg.
To find the momentum of a baseball, multiply its mass by its velocity: 0.14 kg times 30 m/sec = 4.2 kg times m/sec.
The velocity of the baseball thrown by another pitcher can be found by dividing its momentum by its mass: 2.1 kg times m/sec / 0.14 kg = 15 m/sec.
The momentum of a turtle is the product of its mass and velocity: 1 kg times 0.01 m/sec = 0.01 kg times m/sec.
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Ingrid hangs a black shirt on the clothesline to dry. After a few hours, she removes the black shirt from the clothesline and notices that it feels hot. What causes the black shirt to feel hot? How does molecular motion change when the black shirt gets hot?
EXPLAIN!!!
Answer:
The molecular motion starts to speed up when the black shirt becomes hot. because the light that absorbed from the black shirt gets converted to heat, and then absorbed by the shirt.
Explanation:
At sea level, liquid water changes into water vapor ata temperature of 100°C. However, at high altitudes, it changes at a
temperature of 95°C. This shows that phase changes of matter are affected not only by temperature but also by...
Precipitation
Coastal winds
Rocky terrain
Pressure
Answer:
Pressure
Explanation:
This is because Air Pressure decreases as we move upwards from the Surface of the Earth. It is as the Number of Air Molecules get reduced at Higher Altitude which in turn reduces Atmospheric Pressure.
Hope This Helps !
Answer: Pressure
Explanation: