albert presses a book against a wall with his hand. as albert gets tired, he exerts less force, but the book remains in the same spot on the wall. classify each force on the book as increasing, decreasing, or not changing in magnitude when albert reduces the force he is applying to the book. not every classification must be used.

When light reflects from a surface, there is a change in its intensity. Thus, the correct option is C.

Light intensity is also known as luminous intensity. It is the amount of light which is falling on a surface over any given square foot or square meter in size. Light intensity can be measured in terms of lumens per square foot (foot candles) or lumens per square meter (lux).

Light intensity is affected by various factors such as surface on which the light rays strike, the medium, reflection, and the refraction of light.

When a ray of light reflects from a surface, there is a change in the intensity of light and also the speed of light in that medium.

Therefore, the correct option is C.

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Your question is incomplete, most probably the complete question is:

When light reflects from a surface, there is a change in its:

a. frequency

b. velocity

c. intensity

d. phase

Radio waves, like all forms of electromagnetic radiation, are affected by the gravitational field of massive objects such as black holes, which have an event horizon beyond which nothing, not even light, can escape.

Radio waves are a type of electromagnetic radiation with a wavelength longer than infrared light and shorter than microwaves. Radio waves are used for communication and information transfer, and are commonly used in radio and television broadcasting, cellular communication, and satellite communication.

As radio waves approach a black hole, they are subject to gravitational redshift, a phenomenon whereby the wavelength of the wave is stretched out and its frequency decreases as it moves away from the black hole's gravitational field.

This means that the closer the radio waves get to the event horizon, the more they are redshifted, and the longer their wavelengths become.

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Answer:

The circuit in series has a greater resistance.

Explanation:

The current is forced to flow throw two resistors instead of just one as it if it were in parallel.

We can demonstrate an exothermic reaction by adding calcium chloride crystals to water. This means that the reaction releases heat to the surroundings. Which of the following would we most likely expect to observe in this reaction?

Exothermic in terms of the discussion of thermodynamics describes a process or reaction that releases heat energy or light energy, electrical energy, or it could be sound energy. The origin of the word exothermic is from the Greek words "ex-" and "thermein".

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Answer:

c. eco

ya que hay trasmisión de energía de un lado al hacer ecos

Answer:

Entonces, velocidad instantánea = | v | = 0,25 m / s

Explanation:

pregunta completa

Por favor, encontrar el archivo adjunto

Solución

La velocidad instantánea está dada por,

v = dx / dt = pendiente de la curva x-t

aquí, del gráfico:

en x = 1 m ---> t = 8 s

en x = 3 m ---> t = 0 s

entonces, dx = 1-3 = -2 m

dt = 8-0 = 8 s

Entonces,

v = -2/8

v = -0,25 m / s

Dado que, pseed es una cantidad escalar.

Entonces, velocidad instantánea = | v | = 0,25 m / s

Answer:

solar eclipse

Explanation:

because at that time, the moon completely covers the path and casts its shadow on earth because it is present between sun and earth's path. so, solar eclipse occurs.

hope it helps :)

Answer:solar eclipse

Explanation:

Top one is right <3

The electric field in the region r ≤a is E \(= - \frac{r}{4\pi a^3} . \frac{Q}{e_0} r\)

The total charge is enclosed within the Gaussian surface.

Q\(_{enc}\) = 2Q - Q = Q

Therefore, applying Gauss's law over the Gaussian surface

∫\(_{s}\)E.dS = Q\(_{enc}\)/ε₀ ⇒ E.4πr² = Q/ε₀ ⇒ E = Q/4πε₀r²(r)

In question solution:

A\(_{sphere}\) = 4πr²

ΦE = ∫E⋅dA

ΦE = q/ε₀

  E = q/(A⋅ε₀)

  E = q/(4πr²ε₀)

for r≤a, qin = -Q

               E \(= - \frac{r}{4\pi a^3} . \frac{Q}{e_0} r\)

So, the electric field in the region is   E \(= - \frac{r}{4\pi a^3} . \frac{Q}{e_0} r\)

Your question is incomplete but most probably your full question was:

A uniformly charged ball of radius a and charge −Q is at the center of a hollow metal shell with inner radius b and outer radius c. The hollow sphere has a net charge of +2Q.

Part A: Determine the electric field strength in the region r ≤a. Give your answer as a multiple of Q/E0. Express your answer in terms of some or all of the variables a, b, c, r, and the constant π.

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Answer:

1.

A class __ lever never has a mechanical advantage.

A class __ lever always has a mechanical advantage.

A class __ lever could go either way.

Answer: 3; 2; 1

2.

A lever is used to lift an object with a weight of 60 Newtons. The effort force is 15 meters from the fulcrum, while the load force is 5 meters from the fulcrum. What is the mechanical advantage?

Answer: 3

3.

With which class of levers is it possible to increase the force that must be applied?

Answer: Class 1 and 3

4.

600 Joules of work is used to lift a box from the ground to a height of six meters. How much work would have been done if a lever would have been used with an effort arm of 12 meters and a load arm of 6 meters?

Answer: 600 J

5.

A lever with an effort arm of 10 meters and a load arm of 2 meters is used to lift an object weighing 220 Newtons to a height of 4 meters. If 400 Joules of work is done, how much force must have been applied?

Answer: 100 N

Explanation: took the test

Answer:

(Question)

A class __ lever never has a mechanical advantage.

A class __ lever always has a mechanical advantage.

A class __ lever could go either way.

(Answer)

3;2;1

(Question)

A lever is used to lift an object with a weight of 60 Newtons. The effort force is 15 meters from the fulcrum, while the load force is 5 meters from the fulcrum. What is the mechanical advantage?

(Answer)

3

(Question)

With which class of levers is it possible to increase the force that must be applied?

(Answer)

class 1 and 3

(Question)

600 Joules of work is used to lift a box from the ground to a height of six meters. How much work would have been done if a lever would have been used with an effort arm of 12 meters and a load arm of 6 meters?

(Answer)

600 J

(Question)

A lever with an effort arm of 10 meters and a load arm of 2 meters is used to lift an object weighing 220 Newtons to a height of 4 meters. If 400Joules of work is done, how much force must have been applied?

(Answer)

100 N

Explanation:

i just did the quick check UwU

(a) The potential difference across its terminals is 9V.
(b) Thermal energy is being dissipated in the battery at a rate of 180 W.
(c) Electric energy being converted to chemical energy at a rate of 540 W.
(d) When the battery is used to supply 60 A to the starter motor, the potential difference across its terminals is 15 V, and the rate of thermal energy dissipation is 180 W.

(a) The potential difference across the terminals of the battery can be calculated using Ohm's law:
V = emf - I * r
V = 12 V - (60 A) * (0.050 Ω)
V = 12 V - 3 V
V = 9 V

(b) Rate of thermal energy dissipation (P_thermal):
P_thermal = I² * r
P_thermal = (60 A)² * (0.050 Ω)
P_thermal = 3600 A² * 0.050 Ω
P_thermal = 180 W

(c) Rate of electric energy conversion to chemical energy (P_chemical):
P_chemical = V * I
P_chemical = 9 V * 60 A
P_chemical = 540 W

(d) When the battery supplies 60 A to the starter motor:
a) Potential difference across the terminals:
V = emf + I * r
V = 12 V + (60 A) * (0.050 Ω)
V = 12 V + 3 V
V = 15 V

b) Rate of thermal energy dissipation (P_thermal):
P_thermal = I² * r
P_thermal = (60 A)² * (0.050 Ω)
P_thermal = 3600 A² * 0.050 Ω
P_thermal = 180 W

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\(h=v_i_yt+\frac{1}{2}gt^2\\ \\h=\frac{1}{2}(9.81m/s^2)(4s)^2\\\)

h = 78.48 m

Answer:

Explanation:

where h is the height of the cliff, g is the acceleration due to gravity, and t is the time it takes for the ball to hit the ground.

where d is the distance traveled, v is the initial horizontal velocity, and t is the time it takes to travel the distance.

Since the ball is projected horizontally, its initial horizontal velocity is constant, and we can assume it is the same as the speed at which it hits the ground. Therefore, we can write:

Substituting in the given values, we get:

Vernier calipers have a resolution of 1/10 of an inch.

To determine the diameter of circular objects, a vernier caliper is typically employed. The vernier caliper's elongated jaws can precisely measure the circumference of rounded objects.

A vernier caliper has two scales: a moving vernier scale in addition to the primary, fixed scale. The primary scale displays millimeter readings.

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Explanation:

the the electromagnet is placed between two poles of another magnet when the current from the voltage source flows through the coil and the magnetic field is produced around the electromagnetic the poles and the magnet interact with the poles from the electric magnet causing the motor to turn and more coils growing stronger into the motor

Answer:

Dark matter?

Explanation:

Answer:

matter

Explanation:

We may use the equations of motion to calculate the initial distance between the two objects in this issue. Let's call the starting height of the objects "h." Because the first item is at rest, its initial vertical velocity is 0.

When the second item is launched horizontally at a speed of 2.5 m/s, its initial vertical velocity is also 0. When the items crash after falling 20 meters, we may apply the following equation of motion: h = 1/2gt^2 where g denotes gravity's acceleration and t the time it takes for the objects to collide. The horizontal velocity of the second item may be used to calculate the time t: distance = time x speed 20m = 2.5m/s x t t = 8 seconds Now we can use the equation of motion again to find h: h = 1/2gt^2 = 1/2 x 9.81 m/s^2 x (8 s)^2 = 313.92 m Therefore, the initial distance between the objects was 313.92 meters.

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Evaluate the function when d(v) = 24.

Use the quadratic formula to find v.

Where a = 0.0067, b = 0.15, and c = -24.

Therefore, the car should travel at 49.7 km/hr.

We take the positive speed as the answer.

Isotopes that undergo alpha decay release alpha particles, which are helium nuclei composed of two protons and two neutrons. These alpha emitters are used in smoke detectors as they ionize the air, creating a current that triggers the alarm.

In a smoke detector, the alpha emitter is mounted on one plate of a capacitor. As the alpha particles strike the other plate, electrons are knocked off, creating a potential difference across the plates. The plate that loses electrons becomes more positive, while the plate that gains electrons becomes more negative. Therefore, the plate that has the more positive potential is the one that the alpha emitter is not mounted on, as it gains electrons from the alpha particles.

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A. the 22 W lightbulb draws 0.2 A of current when it is plugged directly into a 110 V outlet.

B. the internal resistance of the lightbulb is approximately 550 ohms.

A. The power (P) drawn by an electrical device can be calculated using the equation:

P = V x I

where P is power in watts (W), V is voltage in volts (V), and I is current in amperes (A).

In this case, a 22 W lightbulb is plugged directly into a 110 V outlet. To determine how much current it draws, we can rearrange the equation to solve for I:

I = P / V

Plugging in the values given, we get:

I = 22 W / 110 V = 0.2 A

Therefore, the 22 W lightbulb draws 0.2 A of current when it is plugged directly into a 110 V outlet.

B.

To determine the internal resistance (r) of the lightbulb, we can use Ohm's law:

V = IR + V_internal

where V is the voltage across the lightbulb, I is the current flowing through the lightbulb, r is the internal resistance of the lightbulb, and V_internal is any additional internal voltage drop within the lightbulb.

Since the lightbulb is plugged directly into a 110 V outlet, V is equal to 110 V, and we know from part A that I is 0.2 A. Therefore, we can rewrite the equation as:

110 V = 0.2 A x r + V_internal

To solve for r, we need to know the value of V_internal, which is not given in the problem. However, we can make an assumption that the internal voltage drop is negligible compared to the voltage across the lightbulb, which is often the case for simple resistive devices like lightbulbs.

Assuming V_internal is negligible, the equation simplifies to:

110 V = 0.2 A x r

Solving for r, we get:

r = 110 V / 0.2 A = 550 ohms

Therefore, the internal resistance of the lightbulb is approximately 550 ohms.

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Answer:

5,000+25,000=

Explanation:

At the top of the hill, the cars have a great deal of gravitational potential energy, equal to the cars' weight multiplied by the height of the hill. When the cars are released from the chain and begin coasting down the hill, potential energy transforms into kinetic energy until they reach the bottom of the hill.

Answer:

option B

Explanation:

given,

Satellite B has an orbital radius nine times that of satellite A.

R' = 9 R

now, orbital velocity of the satellite A

........(1)

now, orbital velocity of satellite B

from equation 1

hence, the correct answer is option B

When a comet comes near the Sun, its volatile ice sublimates and changes directly from the solid to the gas phase.

Comets are cosmic snowballs of frozen gases, dust, and rocks, orbiting the Sun. When frozen, comets are the size of a small town. As the comet's orbit approaches the Sun, it heats up, spewing gases and dust onto its giant glowing head, larger than most planets.

Comets vaporize when their orbits come to close to the Sun. Comets do not melt in the strict sense of chinging to liquid. However, since they are made up partly of ice and other volatile compounds, comets vaporize (turn directly to gas) when warmed in the vacuum of space by orbiting near the sun.

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Answer: I believe it’s location D. Or whichever is the location of slow crystallization.

Explanation: Slow crystallization of magma forms granite. Hope this helps. :)

Answer:

D

Explanation:

If the electric field moves the charge from A to B by doing 0.052 J of work, we must determine the potential difference between a and B. That much is clear. The voltage differential is 9122.8 volts as a result.

Moving a +5.7-C charge between A and B causes the electric field to exert 0.052 J of work. When a charge q is transported from point A to point B, the potential difference between the two points is defined as the change in potential energy of the charge divided by the charge, or V = VB - VA. Voltage, also known as potential difference, is frequently abbreviated to V.

The SI unit for electric potential is volt (V). Potential difference is calculated using the method V = W/Q. Joules and Coulombs are the equivalent SI units for work and positive charge, respectively. Consequently, the formula can be written as VB-VA = WA B/Q.

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B) The evidence that a chemical reaction has likely occurred is the formation of a precipitate.

A precipitate is a solid that forms from a chemical  response in a liquid  result. This is a clear  suggestion that a chemical  response has taken place because the reactants have  experienced a chemical change to form a new product that's  undoable in the original detergent.   Option A( a liquid  sluggishly losing volume) may be an  suggestion of evaporation or  immersion, but it doesn't  inescapably indicate a chemical  response.

Option C( boiling water releasing) is a physical change caused by a change in temperature, not a chemical  response. Option D( a change in the shape of a solid) could be a sign of a physical change,  similar as melting or breaking, but it isn't a clear  suggestion of a chemical  response.   thus, the  conformation of a precipitate( option B) is the most  dependable  substantiation that a chemical  response has likely  passed.

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Answer: D

Explanation: I took the test on A P E X

D. The voltage and resistance would be the same.

If the light bulbs are connected in parallel, the current flowing through the light bulbs combine to form the current flowing in the battery, while the voltage drop is 6.0 V across each bulb and they all glow.

In a series circuit, every device must function for the circuit to be complete.

Electricity needs a path to follow to get from one destination to another. And the journey is always the same:

Power – Electricity always starts from a source, like a battery or an outlet.

A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction.

This type of reaction involves the transfer of electrons from one material to another via an electric circuit.

In electronics, a circuit is a complete circular path that electricity flows through. A simple circuit consists of a current source, conductors and a load.

The term circuit can be used in a general sense to refer to any fixed path that electricity, data or a signal can travel through.

Therefore,

If the switch were replaced with a section of wire ,the voltage and resistance would be the same.

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The boat is approaching the dock when it is 5 m from the dock at the speed of 10.4 m/s

It is given that.

height of the pulley = 12m.

rate of rope pulling = 4 m/s

we have to find out what speed is the boat approaching the dock when it is 5 m from the dock.

we will apply the Pythagoras theorem here,

the height of the pulley is 12m so the horizontal distance is considered as x and the vertical distance is here 12 m and the hypotenuse is y.

so  here we can say

x² +12² = y²     ..............1

on differentiating

w.r.t time

2x dx/dt = 2y dy/dy

x dx/dt = y dy/dt

here, we have been given x = 5m from the dock

and dy/dt = 4m/s

from eq.1

y² = 5² +12²

y  = √169

y = 13m

inserting values in x dx/dt = y dy/dt

5 × dx/dt = 13 × 4

dx/dt = 10.4 m/s

therefore boat is approaching the dock at the speed of  10.4 m/s.

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