The efficiency of a device such as a lamp can be calculated using this equation:

efficiency = (useful energy transferred ÷ energy supplied) × 100

Using the formula, calculate the efficiency of the lamp shown in the diagram above.

A) 7%
B) 25%
C) 70%
D) 75%

b.Move the object and image to the right.

To obtain a clear image that is larger, Lindsay should move the object to the left and the screen to the right. Option C is correct.

A lens is a clear object made of glass or plastic that can bend (refract) and focus light.

When an object is placed to the left of a converging lens, a real and inverted image is produced on the other side of the lens. The size and position of the image are determined by the distance between the object and the lens, as well as the distance between the lens and the image.

To obtain a larger image, move the object closer to the lens or move the screen further away from the lens.. Moving the object and image to the right would make the image smaller, and moving the object and image to the left would not necessarily make the image larger or clearer.

Therefore, option C) Move the object to the left and the screen to the right is the correct answer to obtain a clear image that is larger.

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Answer:

1 second

Explanation:

The impulse exerted on the boy is equal to its change of momentum:

[tex]I = \Delta p\\F \Delta t = m \Delta v[/tex]

where

F = 500 N is the push on the boy

[tex]\Delta t[/tex] is the contact time

m = 25 kg is the mass of the boy

[tex]\Delta v = 20 m/s[/tex] is the change in velocity of the boy

Solving the formula for the contact time, we find

[tex]\Delta t=\frac{m\Delta v}{F}=\frac{(25 kg)(20 m/s)}{500 N}=1 s[/tex]

sunlight, and the position of the earth

Solids have molecules that move slowly and are close together and are very attracted to eachother.

Liquids have molecules that move freely and are slightly attracted to eachother.

Gases have molecules that move, but aren't attracted to eachother.

The characteristics of solids, liquids, and gases differ by density, shape, volume, and how sensitive they are to changes in temperature and pressure. Solids are dense with a definite shape, liquids have a definite volume but take the shape of their container, and gases have the lowest density and fill their containers completely.

Understanding the characteristics of the three common phases of matter—solids, liquids, and gases—is fundamental in chemistry. Here's how these states typically compare:

Density: Solids usually have the highest density, followed by liquids, and gases have the lowest density.

Shape: Solids have a definite shape, liquids take the shape of their container, and gases fill the entire volume of their container.

Volume: For a given mass, solids and liquids have a definite volume, while the volume of gases can change markedly with temperature and pressure.

Sensitivity to Temperature: Gases are most sensitive to changes in temperature, followed by liquids, with solids being the least sensitive.

Sensitivity to Pressure: Gases are also highly sensitive to changes in pressure, while the volumes of liquids and solids are relatively incompressible, meaning they are less affected by pressure changes.

The arrangement of atoms or molecules within these phases: In solids, atoms are tightly packed in a fixed arrangement; in liquids, they are close but can slide over each other; and in gases, they are far apart and move freely.

Answer:

dependent on the type of gas and the mass of a mole of the gas

Explanation:

Answer:

0.20

Explanation:

The box is moving at constant velocity, which means that its acceleration is zero; so, the net force acting on the box is zero as well.

There are two forces acting in the horizontal direction:

- The pushing force: F = 99 N, forward

- The frictional force: [tex]F_f=\mu mg[/tex], backward, with

[tex]\mu[/tex] coefficient of kinetic friction

m = 50 kg mass of the box

g = 9.8 m/s^2 gravitational acceleration

The net force must be zero, so we have

[tex]F-F_f = 0[/tex]

which we can solve to find the coefficient of kinetic friction:

[tex]F-\mu mg=0\\\mu = \frac{F}{mg}=\frac{99 N}{(50 kg)(9.8 m/s^2)}=0.20[/tex]

Apply the equation for objects that move in circles:

[tex]a = \dfrac{v^2}{r}[/tex],

where

For this monster:

[tex]\displaystyle a = \frac{({2\;\text{m}\cdot\text{s}^{-1}})^{2}}{3\;\text{m}} = \frac{2^2}{3}\;\text{m}\cdot\text{s}^{-2}= 1.3\;\text{m}\cdot\text{s}^{-2}[/tex].

By Newton's Second Law,

[tex]\Sigma F = m\cdot a[/tex],

where

[tex]\Sigma F = m\cdot a = 60\;\text{kg} \times 1.33333\;\text{m}\cdot\text{s}^{-2} = 80\;\text{N}[/tex].

Weight of an object near the surface of the earth:

[tex]W = m\cdot g[/tex],

where

[tex]W = 60\;\text{kg} \times 9.81\;\text{N}\cdot\text{kg}^{-1}=5.9\times 10^{2} \;\text{N}[/tex].

blue

Because, That object absorbs all colors light waves but does not absorbs Blue. So The blue light is reflected because it is not absorbed.

I believe your answer should be C. Speed.

Answer:

C) Speed

Why?

Think of it like when youre on the road. Your speed is determined by miles per hour. Thats your speed. Hope this helps! Let me know if you don't understand.

Your answer would be - It increases friction by air resistance.

Hope this helps you:)

Feel free if you want me to clarify something!

A parachute slows a skydiver's descent by increasing air resistance, acting against the skydiver's downward momentum. The parachute's increased surface area amplifies this resistance, significantly reducing speed for a safer landing.

A parachute assists a skydiver during landing by increasing air resistance, which slows the skydiver's descent by increasing the upwards force of air pushing against the diver. The open canopy of the parachute expands the surface area against which the air pushes, thereby increasing the air resistance. Initially, the skydiver is in free fall, attaining a maximum or 'terminal' velocity depending on body position. For instance, terminal velocity can be as high as 350 km/h in a headfirst position. The deployment of the parachute dramatically reduces this speed due to the increased air resistance.

It's like dropping a baseball and a tennis ball from the same height at the same time; the baseball will hit the ground first due to less air resistance compared to the lighter tennis ball.

The parachute's role is essential to slow a skydiver's fall, reducing the risk of injury upon landing by decreasing the skydiver's change in momentum on impact.

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Answer:

150.8 J

Explanation:

The heat released by the copper wire is given by:

[tex]Q=mC_s \Delta T[/tex]

where:

m = 10.0 g is the mass of the wire

Cs = 0.377 j/(g.C) is the specific heat capacity of copper

[tex]\Delta T=40.0 C - 80.0 C=-40.0 C[/tex] is the change in temperature of the wire

Substituting into the equation, we find

[tex]Q=(10.0 g)(0.377 J/gC)(-40.0^{\circ})=-150.8 J[/tex]

And the sign is negative because the heat is released by the wire.

Using Coulomb's Law, the electrostatic force between two 1 Coulomb charges separated by 1 meter is calculated to be [tex]8.99 \times 10^9[/tex] Newtons. This significant repulsive force illustrates the power of electrostatic forces at even relatively large distances.

Calculating Electrostatic Force Between Two Charges

To determine the electrostatic force between two pith balls, each with a charge of 1 Coulomb, separated by a distance of 1 meter, we use Coulomb's Law. Coulomb's Law is given by the formula:

[tex]F = k \times (|q_1 \times q_2|) / r^2[/tex]

where:

Substituting the given values:

[tex]F = 8.99 \times 10^9 N.m^2/C^2 \times (1C \times 1 C) / (1 m)^2[/tex]

This simplifies to:

[tex]F = 8.99 \times 10^9 N[/tex]

Answer: The given statement is true.

Explanation:

Density is defined as mass per unit volume.

Mathematically,      Density = [tex]\frac{mass}{volume}[/tex]

So, when more is the density of air molecules then it means there will be more mass per unit volume. This will lead to more number of collisions between the molecules. Hence, more will be the air pressure.

Thus, we can conclude that the statement air pressure is caused by the density of gas molecules in the air, is true.

Answer:

TRUE!

Explanation:

:)

Answer would be: alternating.There is no electrical connection between the two coils. These only work if alternating current is supplied to the main coil. If DC was supplied, there would be no flow of current in the minor coil.

Answer:

alternating

Explanation:

The transformer works on the principle of electromagnetic induction.

When a changing magnetic flux is linked with the coil, then an induced emf is produced.

When an alternating current is give to the primary coil, the magnetic flux linked with the coil changes, which linked to the secondary coil of the transformer and hence an induced emf is developed.

To find the height of the building, we use the free-fall equation s = ut + ½ at² with the time of fall (2.6s), resulting in a height of approximately 33.18 meters.

To calculate the height of the building given that a ball is dropped and takes 2.6 seconds to reach the ground, we can use the equations of motion for an object in free fall. Assuming the initial velocity (u) is 0 m/s (since the ball is dropped) and acceleration (a) is due to gravity (g = 9.81 m/s²), the equation we use is:

s = ut + ½ at²

Where:

Plugging in the values, we have:

s = 0 m/s (2.6 s) + ½ (9.81 m/s²)(2.6 s)²

s = ½ (9.81 m/s²)(6.76 s²)

s = 4.905 m/s² × 6.76 s²

s = 33.1763 m

Therefore, the height of the building is approximately 33.18 meters.

Answer:

[tex]577.7 m/s^2[/tex]

Explanation:

First of all, we need to calculate the electric force exerted on the particle. This is given by:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where:

k is the Coulomb's constant

[tex]q_1 = 45 \mu C=45 \cdot 10^{-6}C[/tex] is the charge of the particle

[tex]q_2 = -11 \mu C = -11 \cdot 10^{-6}C[/tex] is the charge of the second particle

[tex]r=77 cm=0.77 m[/tex] is the initial separation between the particles

Substituting,

[tex]F=(9\cdot 9 Nm^2C^{-2})\frac{(45\cdot 10^{-6}C)(-11 \cdot 10^{-6}C)}{(0.77 m)^2}=-7.51 N[/tex]

where the negative sign tells us that it is an attractive force. We can ignore it since we are only interested in the magnitude of the acceleration, which is given by

[tex]a=\frac{F}{m}[/tex]

where

m = 13 g = 0.013 kg is the mass of the particle

Substituting, we find

[tex]a=\frac{7.51 N}{0.013 kg}=577.7 m/s^2[/tex]

in this since your volume remains at a constant you'll need to use Gay-Lussacs law, p1/t1=p2/t2.

your temp should be converted in kelvin

variables:

p1=3.0×10^6 n/m^2

t1= 270k

just add 273 to your celcius

p2= ? your solving for this

t2= 315k

then you set up the equation

(3.0×10^6)/270= (x)(315)

you then cross multiply

(3.0×10^6)315=270x

distribute the 315 to the pressure.

9.45×10^8=270x then you divide 270 o both sides to get

answer

3.5×10^6 n/m^2

M.A = 4.25

Mechanical advantage is the ratio of the force required to do something in comparison to the actual force required using a simple machine.

It is the ratio of output force to the input force.

M.A = Output Force/ Input Force

Out put force 85 Kg = 850 N

Input force = 200 N

Therefore;

M.A = 850 N/200 N

        = 4.25

Hello

The formula for centripetal force is:

Fc = m*[(V^2)/r]

Where

m = 329000 g

V = 34 m/s

r = 33 m

Then

Fc = (329000)*[(34^2)/33]

Fc = 11.524.969,7

Best regards

A converging lens is a type of optical lens that is thicker at the center than at its edges; this type of lens concentrate or converge (that is why its name) at a point the rays of light that pass through it.

If we talk about the formation of the image, its location and nature will depend on where the object is located with respect to the focal length of the lens. So, in general:

- If the object is considerable away from the focal point, a real image (which can be projected on a screen) will be formed, inverted and smaller than the object.

-If the object is very close to the focal point, a virtual image will be observed (it is given this name because the image can not be projected on a screen) upright and bigger than the object.

According to this, the image of the coin will not be seen.

If the object is positioned at the focal point, the image is formed at infinity and its nature is virtual.

The term lens refers to any refracting surface. Recall that refraction is the bending of the light ray at the interval between two media.

The nature of the image formed by a lens depends on the position of the object. If the object is positioned at the focal point, the image is formed at infinity and its nature is virtual.

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proton boisssssssssssssssssssssssssssssss

Making the nail longer does not affect the strength of the electromagnet unless more coil is added to it.

Electromagnet is a form of magnet which has a magnetic field that is produced by an electric current. Electromagnets usually consist of wire wound into a coil.

Therefore, Making the nail longer does not affect the strength of the electromagnet unless more coil is added to it.

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Making the nail longer does not affect the strength of the electromagnet unless more coil is added to it.

Electromagnet is a form of magnet which has a magnetic field that is produced by an electric current. Electromagnets usually consist of wire wound into a coil.

The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments

Therefore, Making the nail longer does not affect the strength of the electromagnet unless more coil is added to it.

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Mass and weight are different. Mass is the measurement of how much matter an object has, while weight deals with the pull of gravity. For example, an astronaut floating in space is weightless, due to the limited influence of gravity. But he will still have mass, that is because mass and weight are different  :)

Mass is entirely a property of the object.  So the conditions and environment surrounding the object have no effect on it, and it doesn't change.

Weight is a measurement of the interaction between the object and its environment, so its weight changes as it moves from place to place.

Example:  

A standard brass cylinder in a laboratory set of calibrated masses is marked   "1 kilogram".

When you weigh it on Earth, the scale says "9.8 Newtons" or "2.2 pounds".

If you take the set of calibrated masses to the Moon with you, and weigh the same "1 kilogram" piece, it weighs "1.62 Newtons" or "5.8 ounces" up there.  

The frequency of a wave is the inverse of the wave's period.

(Instead of "inverse", the word "reciprocal" is more appropriate.  

It means that [ frequency = 1/period ], and [ period = 1/frequency ].

The easiest way to remember both of these is to just remember that (frequency) x (period) = 1 .)

Answer:

period

Explanation:

1. Magnitude: 4.4 T

The net force on the wire is zero, therefore the magnetic force must be equal to the weight of the wire:

[tex]F_M = W = 1.47 N[/tex]

Where the magnetic force is

[tex]F_M = IBL sin \theta[/tex]

where

I = 1.75 A is the current

B is the magnetic field

L = 0.20 m is the length of the wire

[tex]\theta=90^{\circ}[/tex] is the angle between the direction of L and B

Solving the formula for B, we find the magnitude of the magnetic field:

[tex]B=\frac{F_M}{ILsin \theta}=\frac{1.47 N}{(1.75 A)(0.20 m)(sin 90^{\circ})}=4.2 T[/tex]

2. Direction: westward

The direction is given by the right's hand rule. We know that:

- thumb --> magnetic force (upward)

- index finger --> current (north)

- middle finger --> direction of magnetic field: so, it must be westward.

- middle

With a broken line????????

Answer:

broken line

Explanation:

Water is a good example of the law of conservation because, water when not moving has potential energy, and when moving like for example tap water, it turns kinetic.

The best example of the law of conservation of energy is the rolling skateboard that slows down because its kinetic energy changes to heat. This illustrates that energy is not created or destroyed but simply changes forms.

The law of conservation of energy states that energy cannot be created or destroyed, but it can be transferred or transformed from one form to another.

Option A is incorrect because the energy of the basketball does not disappear when it stops bouncing. Instead, the kinetic energy of the basketball is transformed into other forms of energy, such as sound and heat, when it hits the ground.

Option C is incorrect because the energy of the book is not destroyed when it falls to the ground. Instead, the potential energy of the book is converted into kinetic energy as it falls, and then some of that kinetic energy is transformed into sound and heat when it hits the ground.

Option D is incorrect because the ramp does not create energy for the toy car. Instead, the ramp converts some of the potential energy of the toy car into kinetic energy as it moves down the ramp.

Therefore, the best example of the law of conservation of energy is option B, where some of the kinetic energy of the skateboard is transformed into heat as it slows down. This illustrates the principle that energy cannot be destroyed, but can be transformed from one form to another.

Complete Question - Which is the best example of the law of conservation of energy?

A) A basketball stops bouncing because its energy disappears.

B) A rolling skateboard slows down because some of its kinetic energy  changes to heat.

C) A falling book hits the ground and all of its energy is destroyed.

D) A toy car gains speed as it moves down a ramp because the ramp creates energy.

- They require a physical medium to propagate.

- They can be described in terms of frequency, wavelength, and amplitude.

- They can be refracted, reflected, and diffracted.

- They can transfer energy from one point to another.

My best hobby is driving. Driving has something to do with Newton's first law of motion, which states that an object will continue to be in its state of rest or in uniform motion in a straight line unless it is acted upon by an external force. This law means that an object will continue to be in motion in the same direction unless it is acted upon by a force. Newton's first law of motion is also called the law of inertia.

I usually experience the law of inertia when I am driving my car.

Every morning, for me to move the car from its state of rest to a state of uniform motion, I have to switch on the ignition, which represent an unbalanced force that move the car out of its states of rest. When I am driving, the car continue in motion and in the same direction, unless I apply the brake. The application of the brake is an example of applying an unbalanced force to stop a body in motion.