Barbara places an object in front of a mirror. The mirror produces an image that is inverted, real, and smaller than the object.

Which kind(s) of mirror could Barbara be using?

convex, because concave and plane mirrors produce only virtual images
concave, because plane and convex mirrors produce only upright virtual images
concave or convex, because both types of mirrors produce images that are inverted and real
convex or plane, because both types of mirrors produce an image that is smaller than the object

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.

Answer:

It is not as windy now as it was a little while ago

Slackening wind indicates that the wind speed or intensity is decreasing, meaning it is not as windy now as it was a little while ago.

When we say that the wind is slackening, it means that the speed or force of the wind is decreasing or getting weaker. It suggests that it is not as windy now as it was a little while ago. A slackening wind does not necessarily mean that the wind is now mixed with rain and sleet, nor does it automatically mean that the wind is creating dangerous driving conditions. It solely relates to the intensity or force of the wind which is lowering.

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Answer:

False

Explanation:

Mercury has 0 natural satellites.

Answer:

B)

Explanation:

Aside from his numerous inventions, Galileo also laid down the first accurate laws of motion for masses. Galileo measured that all bodies accelerate at the same rate regardless of their size or mass.

Answer:

Galileo and kepler

Explanation:

Aside from his numerous inventions, Galileo also laid down the first accurate laws of motion for masses. Galileo measured that all bodies accelerate at the same rate regardless of their size or mass.

Answer:

60m/s

Explanation:

v=s÷t

75m÷1.25s=60m/s

Answer

60

Explanation:

This is because if the question gives you the distance and the time, you have to find the speed.

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:

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.

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:

Answer:

Correct answer: Third statement  P = 4900 W

Explanation:

Given:

m = 500 kg  the mass of the elevator

h = 10 m  reached height after t = 10 seconds

P = ? power of the motor

The formula for the calculating power of the motor is:

P = W / t

since work is a measure of change in this case of potential energy then it is:

W = ΔEp = Ep - 0 = Ep

In this case we must take g = 9.81 m/s²

Ep = m g h = 500 · 9.81 · 10 = 49,050 W ≈ 49,000 W

Ep ≈ 49,000 W

P = Ep / t = 49,000 / 10 = 4,900 W

P =4,900 W

God is with you!!!

Answer:

276 days

Explanation:

in order to decay to half, it will be 138 days. in order to half that again down to a quarter, it will be another 138 days. 138+138 is 276, thus, 276 days.

Answer:

276 days

Explanation:

Answer:

its unit is Ohm

Explanation:

Resistance means material which resist the passing current  through it and the value of resistance says how much the material is resisting the current and it temperature dependent and the unit is Ohm.

Answer:

c

Explanation:

The correct option is C. They created a closed circuit to attract paper clips using a copper wire coiled around an iron nail. The copper wire was also touching both the positive and negative poles of a D- Battery.

A permanent magnet's magnetic flux constantly flows from its N-pole to its S-pole.

The magnetic field and the current combine to produce force when a conductor is placed in a magnetic field and current passes through the conductor. "Electromagnetic force" is the name of the force.

The direction of the magnetic force, the flux, and the current are all determined by the fleming's left hand rule.

Therefore, The correct option is C. They created a closed circuit to attract paper clips using a copper wire coiled around an iron nail. The copper wire was also touching both the positive and negative poles of a D- Battery.

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Answer:

forest rual area

Explanation:

because thats where i live

Final answer:

The desert environment of the Great Basin Desert where I live impacts the city's architecture, economy, and conservation efforts. Unique flora and fauna, along with minimal water resources, shape the community's way of life and urban planning. Geographic features like nearby mountains further influence the city's development and residents' daily activities.

Explanation:

The area in which I live is a desert, specifically the northern tip of the Great Basin Desert. The natural setting of a city can vastly influence its history, design, layout, and way of life. For instance, the dry and semiarid climate of this area has led to a fragile ecosystem. Three examples of how the environment has shaped my city include the architecture, which is designed with materials suitable for hot and dry conditions; the city's economy, which is likely to be based on industries that can thrive in such a climate, such as tourism; and conservation efforts, which are significant due to concern for the fragile ecosystem and endangered species in the region.

This desert environment means we have a unique set of flora and fauna adapted to the dry conditions. Construction materials tend to reflect the limited resources available, leaning more into minimalist designs that can maintain cooler indoor temperatures. The economy is also shaped by the environment, as agricultural practices and water usage have to be carefully managed, and recreational activities often revolve around the unique landscape, such as hiking in desert parks.

The surrounding landscape is characterized by low rainfall and limited water sources, which also impacts urban planning regarding water usage and storage. Additionally, geographic features such as nearby mountains can influence weather patterns and therefore impact city planning and daily life.

Answer: The absolute value of the mutual force between the two point charges is 5.3952 x 10^-3 N.

Explanation:

The mutual force between two point charges can be calculated using Coulomb's law, which states that the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them:

F = k * (q1 * q2) / r^2

where F is the force, k is Coulomb's constant (9.0 x 10^9 N m^2/C^2), q1 and q2 are the charges of the two-point charges, and r is the distance between them.

In this problem, q1 = 9.2 E-6 C, q2 = 3.5 E-6 C, and r = 3 E-2 m. Substituting these values into Coulomb's law, we get:

F = (9.0 x 10^9 N m^2/C^2) * [(9.2 E-6 C) * (3.5 E-6 C)] / (3 E-2 m)^2

F = 5.3952 x 10^-3 N

The absolute value of the mutual force between the two point charges is 5.3952 x 10^-3 N.

Answer:

80 angle of incidence=angle of reflection

Explanation:

Answer:

80 angle of reflection!

Explanation:

Because it is a flat, smooth surface it will reflect like that of a normal plane mirror, so the angle of reflection will be equal to that of the angle of incidence!

Hope this helps you understands!

Final answer:

In a longitudinal wave, areas where particles are closer together are called compressions. The distance between two compressions or two rarefactions is the wavelength of the longitudinal wave, which characterizes sound waves among others.

Explanation:

In a longitudinal wave, the places where particles of matter are closer together are called compressions. Longitudinal waves consist of alternating areas of compressions and rarefactions. Compressions are regions of higher pressure, whereas rarefactions are areas of lower pressure. The wavelength of a longitudinal wave is the distance between two consecutive compressions or two consecutive rarefactions. Sound waves are a common example of longitudinal waves, where the vibration and movement of particles occur in the same direction as the propagation of the wave.

It's important to note that in a transverse wave, the oscillation of particles occurs perpendicular to the direction of the wave's travel. However, in longitudinal waves, such as sound waves, the particles move back and forth parallel to the direction of the wave, creating the compressions and rarefactions that characterize this type of wave.

Answer:

1000 N

Explanation:

The magnitude of the electrostatic force between two charged object is given by

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

where

k is the Coulomb constant

q1, q2 is the magnitude of the two charges

r is the distance between the two objects

Moreover, the force is:

- Attractive if the two forces have opposite sign

- Repulsive if the two forces have same sign

In this problem:

[tex]q_1=q_2=+1C[/tex] are the two charges

r = 3000 m is their separation

Therefore, the electric force between the charges is:

[tex]F=(9\cdot 10^9)\frac{(1)(1)}{3000^2}=1000 N[/tex]

Answer: C. The critical angle is less than 47°.

Explanation:

The critical angle is the angle such that the refracted beam is parallel to the surface of the prism, so we will have total internal refraction

This comes from the snell law:

n1*sen(a1) = n2*sen(a2)

where n1 is bigger than n2.

Then:

sen(a1) = (n2/n1)*sin(a2)

n2/n1 is smaller than 1, so the right side only can go up to (n2/n1)*1 (when a2 = 90°)

sen(a1) = n2/n1

this equation defines our critical angle.

If we use an angle bigger than the critical angle, we still have a total internal reflection, so we will no see a refracted beam.

In the image, we can see that the angle between the beam and the normal to the surface of the prism is 47°, and we also can see that we have a refracted beam, this means that 47° must be smaller than the critical angle.

So the correct option is C.

Answer:

B. The critical angle is greater than 47°.

Explanation:

Explanation: Light is reflected back into a prism whenever the angle of incidence is greater than the critical angle. When the angle of incidence is less than the critical angle, the light refracts as it exits the prism. In this case, the violet light is refracted as it exits the prism, so the critical angle must be greater than 47°. Also, you can conclude that all other colors of visible light will be refracted as it exits the prism. Shorter wavelengths (at the violet end of the spectrum) are the "first" to be reflected. If violet light is not reflected, then no visible light will be reflected.

Answer:

false

Explanation:

Kinetic energy only exist if object has motion.

At point 3 , kinetic energy is highest.

We know that,  

                              Kinetic energy  =  [tex]\frac{1}{2} mv^{2}[/tex]

Where m is mass of pendulum and v is speed of pendulum.

Since the mass of the pendulum  would not  change, the only way for kinetic energy to change is for the speed of the pendulum to change.

Kinetic energy is highest when the velocity is the highest. This occurs at the bottom of the pendulum.

At the lowest point (Point 3 ) the pendulum has its greatest speed.  All of the energy in the pendulum is kinetic energy and there is no gravitational potential energy.

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Answer:

When one object heats another, the temperature increase of one object does not always equal the temperature decrease of the other object because one object has a higher specific heat than the other.

The temperature increase of one object does not necessarily equal the temperature decrease of the other during a heat transfer process. Factors such as the mass of the substance and certain physical properties related to its phase also influence the heat transferred. Heat transfer is guided by the law of conservation of energy, ensuring total energy remains constant.

When two objects at different temperatures come into contact, heat flows from the hotter object to the colder one, a process known as heat transfer. However, the temperature increase of one object does not equal the temperature decrease of the other. This is due to the fact that the heat transferred to or from a substance depends not only on the difference in temperature, but also on the mass of the substance and certain physical properties related to the phase of the substance.

Let's consider two objects, object X with a temperature Tx and object Y with a temperature Ty. When X and Y come into contact, heat spontaneously flows from X (hotter object) to Y (colder object), resulting in a loss of thermal energy for X and a gain for Y. The final temperatures of X and Y will not be simply Tx - Ty, and Ty + Tx, they will depend on the specific heat capacities and masses of the objects (not included in the initial question).

This concept is deeply connected with the law of conservation of energy, which states that energy cannot be created or destroyed, but can only be transferred or transformed from one form to another. Consequently, the total energy of the system (both objects) remains constant during this process of heat transfer.

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Answer:

The heat capacity of the sample of metal is 664j/kg.°C

Explanation:

Kindly find attached a detailed solution to this question for you reference.

Given data

Mass of sample m1= 0.45kg

Temperature of sample θs= 80°c

Mass of water mw = 0.7kg

Temperature of water θw= 15°C

Specific heat capacity of water Cw=

4200j/kg.°C

Equilibrium Temperature θ3= 21°C

HEAT LOSS BY SUBSTANCE =HEAT GAINED BY WATER

What is Quantity of heat?

Quantity of heat is the amount of heat absorbed or given out by a body Q=mcθ

What is the heat capacity?

Heat capacity is the amount of heat required to raise the temperature of a substance by 1k.The S.I unit is joule per Kelvin J/k

What is specific heat capacity?

The specific heat capacity is the amount of heat required to raise the temperature of 1kg of substance by 1k

Answer:

5 m/s

Explanation:

The speed of a wave in a string is related to the tension in the string by the equation

[tex]v=\sqrt{\frac{T}{\mu}}[/tex]

where

v is the speed of the wave

T is the tension in the string

[tex]\mu[/tex] is the linear density of the string

We can rewrite the equation as

[tex]\frac{\sqrt{T}}{v}=\sqrt{\mu}[/tex]

In this problem, the tension in the string is changed; however, its linear mass density remains constant. So we can write:

[tex]\frac{\sqrt{T_1}}{v_1}=\frac{\sqrt{T_2}}{v_2}[/tex]

where:

T1 = 40 N is the initial tension in the string

v1 = 10 m/s is the initial speed of the wave

T2 = 10 N is the final tension in the string

Solving for v2, we find the final speed of the wave:

[tex]v_2=v_1 \sqrt{\frac{T_2}{T_1}}=(10)\sqrt{\frac{10}{40}}=5 m/s[/tex]

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.

Answer:

The coefficient of kinetic friction is [tex]\mu_k = 0.07.[/tex]

Explanation:

Let us call [tex]F_k[/tex] the force of friction, then we know that [tex]220N - F_k[/tex] is what has caused the acceleration [tex]a =3m/s^2[/tex]:

[tex]220-F_k =ma[/tex]

[tex]220-F_k =(60kg)(3m/s^2)[/tex]

[tex]220-F_k =180[/tex]

[tex]F_K = 40N[/tex]

Now this frictional force relates to the coefficient of kinetic friction [tex]\mu_k[/tex] by  

[tex]F_k = \mu_k N[/tex]

where [tex]N=mg[/tex] is the normal force.

Putting in numbers and solving for [tex]\mu_k[/tex] we get:

[tex]\mu_k = \dfrac{F_k}{mg}[/tex]

[tex]\mu_k = \dfrac{40N}{(60kg)(10m/s^2)}[/tex]

[tex]\boxed{\mu_k = 0.07}[/tex]

Hence, the coefficient of kinetic friction is 0.07.

To find the coefficient of kinetic friction, we can set up an equation using the net force, the applied force, and the normal force. Solving for the coefficient of kinetic friction, we find it to be approximately 0.68.

To find the coefficient of kinetic friction between the block and the ground, we need to consider the forces acting on the block. The force of friction opposes the applied force and is equal to the coefficient of kinetic friction multiplied by the normal force. The normal force is equal to the weight of the block, which is 60 kg multiplied by the acceleration due to gravity (9.8 m/s^2).

From the given information, the block accelerates at 3 m/s^2 to the left. Using Newton's second law (F = ma), we can calculate the net force acting on the block. The net force is equal to the applied force minus the force of friction.

Since the block is accelerating to the left, the net force is in the same direction as the applied force. Therefore, the net force is equal to the applied force minus the force of friction. Setting up the equation: F - μkN = ma. Rearranging the equation, we can solve for the coefficient of kinetic friction μk.

μk = (ma + F)/N = (60 kg * 3 m/s^2 + 220 N)/(60 kg * 9.8 m/s^2)

Plugging in the given values:

μk = (180 N + 220 N)/(588 N) = 400 N / 588 N ≈ 0.68

Gravity is the attraction of every body to every other body due to the masses of each body. The larger the mass, the greater the force. It also depends on the distances: the closer the bodies, the greater the force. Gravity is directed toward the center of a body, and the distance is measured from the center.

When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.

Answer:

TRUE

Explanation:

A binary star is a star system consisting of two stars orbiting around their common barycenter. Systems of two or more stars are called multiple star systems.

Answer:

True

Explanation:

Answer:

Photosynthetic organisms

Explanation:

The electromagnetic energy of sunlight is converted to chemical energy in the chlorophyll-containing cells of photosynthetic organisms. In eukaryotic cells these reactions occur in the organelle known as the chloroplast

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Answer:

The producers

Explanation: