Which one of the following statements concerning spherical mirrors is correct?A. Only a convex mirror can produce an enlarged image.
B. Both concave and convex mirrors can produce an enlarged image.
C. Only a concave mirror can produce an enlarged image, provided the object distance is less than the radius of curvature.
D. Only a concave mirror can produce an enlarged image, provided the object distance is greater than teh radius of hte curvature.

Answer:

Cape Point lighthouse

Explanation:

The lighthouse is located South of Cape Town, at a point where boats turn to go around the tip of Africa.

The new lighthouse has the most powerful light of all the lighthouses in South Africa, with a power of 10 megacandelas.  That's why it's being visible for up to 63 km around.

It's a very important lighthouse helping to conduct the traffic around dangerous waters where 2 oceans meet.

Answer:

B

Explanation:

Energy at the top of the hill = energy at the bottom of the hill + energy lost

PE = KE + E

mgh = 1/2 mv² + E

(52 kg) (9.8 m/s²) (50.0 m) = 1/2 (52 kg) (25 m/s)² + E

25480 J = 16250 J + E

E = 9230 J

Answer:

a few hundred thousand years after the Big Bang

Explanation:

Answer:

[tex]2.46\cdot 10^5 J[/tex]

Explanation:

The enegy of a single photon is given by:

[tex]E=\frac{hc}{\lambda}[/tex]

where

h is the Planck costant

c is the speed of light

[tex]\lambda[/tex] is the wavelength of the photon

In this problem,

[tex]\lambda=486 nm=4.86\cdot 10^{-7}m[/tex]

so the energy of one photon is

[tex]E_1=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{4.86\cdot 10^{-7}m}=4.09\cdot 10^{-19} J[/tex]

1 mole of photons contains a number of Avogadro of photons:

[tex]N_A = 6.022\cdot 10^{23}[/tex]

therefore, the total energy of 1 mole of these photons will be

[tex]E=N_A E_1 = (6.022\cdot 10^{23})(4.09\cdot 10^{-19} J)=2.46\cdot 10^5 J[/tex]

The energy of a mole of photons with a wavelength of 486 nm is 2.462 x 10^5 joules, calculated by applying Planck's equation and using Avogadro's number.

The energy in joules of a mole of photons associated with visible light of wavelength 486 nm can be calculated using Planck's equation, E = hc/\u03bb, where h is Planck's constant (6.626 x 10-34 J·s), c is the speed of light (3.00 x 108 m/s), and \u03bb is the wavelength of the light (486 nm or 486 x 10-9 m). To find the energy per mole of photons, we also use Avogadro's number (6.022 x 1023 photons/mole).

First, calculate the energy of one photon:

E = hc/\u03bb = (6.626 x 10-34 J·s) (3.00 x 108 m/s) / (486 x 10-9 m) = 4.09 x 10-19 J/photon

Then, calculate the energy per mole of photons:

Emole = E · Avogadro's number = 4.09 x 10-19 J/photon x 6.022 x 1023 photons/mole = 2.462 x 105 J/mole

Therefore, the energy of a mole of photons at 486 nm is 2.462 x 105 joules.

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Resistors 'C' and 'D' are in series.  There's only one possible route for current to flow through them.  

Every electron that flows through one of them has to flow through the other one.  

The current (amount of charge per second) must be the same in 'C' and 'D', no matter how many ohms of resistance either one may have. (answer-choice B)

Answer:

C & D

Explanation:

physics s2

Size. The answer is size.

It keeps the eggs warm until they hatch is your answer

If we are talking about simple harmonic motion, we are talking about waves and in this case the frequency [tex]f[/tex] is related to the period of oscillation [tex]T[/tex] in an inverse proportion.

Now, for a mass-on-a-spring system the period is given by:

[tex]T=2\pi\sqrt{\frac{m}{k}}[/tex]

Where [tex]m[/tex] is the oscillating mass and [tex]k[/tex] the spring constant, which depends on the spring stillness.

As we can see in this equation:

If we change [tex]m[/tex] and [tex]k[/tex] we will affect the period, hence the frequency.

Nevertheless, we do not see any relation with the Amplitude, this means the period (hence the frequency) does not depend on the amplitude.

C is the answer

you got right

D) store chemical energy and transfer it to electrical energy when a circuit is connected.

Hope this helps chu

Have a great day ♡♡

Answer: the air makes it go WHOOSH!!

Explanation:

just kidding. the air pushes the wings up because of the way they are shaped. this creates lift.

When all of these things work together(mentioned below), the big heavy piece of metal becomes a plane that can fly high up in the sky!

Aeronautics is the science of designing planes and other flying machines. Aeronautical engineers must understand four fundamental areas in order to design planes. Engineers must understand all of these elements in order to design a plane.

A plane uses something called "air pushing it up" to help it fly. This air pushing is called "lift." The wings of the plane are shaped like long, flat feathers that help create lift.

Another way the plane flies is by using its engine to make a strong "whoosh" of air that moves the plane forward. This strong "whoosh" of air is called "thrust."

And finally, the plane uses its tail to help it steer and balance, just like a bird uses its tail to help it fly straight.

So, when all of these things work together, the big heavy piece of metal becomes a plane that can fly high up in the sky.

Learn more about aeronautics here:
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Definitely B.

Unlike poles attract and like poles repeal

Every substance, body or material has mass and volume, however the mass of different substances occupy different volumes.

This is where density  [tex]D[/tex]  appears as a  physical characteristic property of matter that establishes a relationship between the mass  [tex]m[/tex] of a body or substance and the volume  [tex]V[/tex] it occupies.

[tex]D=\frac{m}{V}[/tex]

So, according to this equation, the density is inversely ptoportional to the volume:

If the volume increases, the density decreases.

This is what a fish does to have buoyancy, since the density of a body is related to its buoyancy:

A body will float on another fluid if its density is lower.

I'm not positive but if I'm reading the question right it would be the big bang sorry if I'm wrong

1) Tropical rain forest

2) Temperate deciduous forest

3) Temperate grassland

4) Temperate grassland

*The product of photosynthesis is B) glucose because it makes glucose from the plant.

The products of photosynthesis are Glucose, Oxygen and water. Since oxygen and water exit through stomata, the main product is Glucose.

Answer: Option B

Explanation:

The solar energy is utilized to produce sugar in the process of photosynthesis. This process occurs in plants, bacteria's and protistans. In the photosynthesis process, the sunlight energy is transformed into some usable chemical energy. It is possible due to the pigment called chlorophyll which is green in color and present in plants.  

Most time photosynthesis process makes use of water and releases oxygen as output. The leaves of the plants are the collector of solar. The intakes of photosynthesis process are carbon dioxide, water and the results are glucose and oxygen.  

Answer:

1.3 m

Explanation:

The work done in lifting the backpack is equal to the change in gravitational potential energy of the backpack, so:

[tex]\Delta U=W \Delta h[/tex]

where

W = 100 N is the weight of the backpack

[tex]\Delta h[/tex] is the change in heigth of the object

In this problem, we know that

[tex]\Delta U = 130 J[/tex]

so we can re-arrange the equation to find the change in height of the backpack:

[tex]\Delta h = \frac{\Delta U}{W}=\frac{130 J}{100 N}=1.3 m[/tex]

Answer:

4

Explanation:

In order for the current to continue flowing through the circuit (and for the bulbs to continue shining), there must be a closed path containing the battery where current can flow. Let's see the effect of removing each bulb on the circuit:

- 1: when removing bulb 1 only, the current can still flow through the path battery-bulb 3- bulb 4

- 2: when removing bulb 2 only, the current can still flow through the path battery-bulb 3- bulb 4

- 3: when removing bulb 3 only, the current can still flow through the path battery-bulb 1-bulb 2- bulb 4

- 4: when removing bulb 4 only, the current can no longer flow. In fact, there is no closed path that contains the battery now, so the current will not flow and all the bulbs will stop shining.

Answer:

4

Explanation:

It is a parrallel circuit

Answer: trial 3

Explanation:

impulse equals force x time so for each trial it would be a force which is 500 x 8 individual time trial 3 has the highest time which would equal the highest impulse.

500 x .45 = 225

Answer:

Trial 3

Explanation:

got it correct

Answer:

C

Explanation:

Radiation affects both cancer cells and healthy cells, but it affects cancer cells more.

Radiation is often used in cancer treatment because the rapid cell division of cancer cells makes them vulnerable to radiation damage. These cells often cannot repair this damage as effectively as healthy cells, leading to their destruction. However, radiation is not the only method for fighting cancer.

Radiation is often used to destroy cancer cells because, in general, cancer cells divide more rapidly than normal cells, which makes them more susceptible to the damaging effects of radiation. This is the reason behind the option (C). While radiation does affect both cancerous and healthy cells, the quick division of cancer cells often makes them more vulnerable to being damaged by the radiation. However, they often cannot repair this damage as effectively as healthy cells can. Consequently, the cancer cells are destroyed, with minimal effect on the healthy cells. It's important to note that radiation is not the only method to fight cancer as stated in option (D). Other methods include surgery, chemotherapy, and immunotherapy. Furthermore, radiation is not a tracer that picks out cancer cells to destroy as stated in option (B).

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Answer:

Explanation:

The center of mass lies on a line that joins position 4 of one start with position 4 of the other star.  The shortest distance between these two points will produce the largest velocity. You are using F = m v^2/R

Small R = large force.

Large Force = increased speed.

The masses don't have any effect on the outcome: they remain constant.

Answer:

B) 10 parsecs

Explanation:

The distance of a star measured with the parallax method is given by:

[tex]d=\frac{1}{\theta}[/tex]

where

d is the distance, in Parsec

[tex]\theta[/tex] is the parallax angle, in arcseconds

For the star in the problem, the parallax angle is

[tex]\theta=0.1''[/tex]

therefore, the distance of the star is

[tex]d=\frac{1}{0.1''}=10 pc[/tex]

so, 10 parsecs.

Answer:

35.7 mW

Explanation:

The intensity of light after passing through a polarizer is given by

[tex]I=I_0 cos^2 \theta[/tex]

where

[tex]I_0[/tex] is the initial intensity of the light

[tex]\theta[/tex] is the angle between the direction of polarization of the initial light and the transmission axis of the polarizing filter

Keeping in mind that the power is directly proportional to the intensity:

[tex]P \propto I[/tex]

we can rewrite the previous equation as

[tex]P=P_0 cos^2 \theta[/tex]

where we have

[tex]P_0 = 200 mW[/tex]

[tex]\theta=90^{\circ}-25^{\circ}=65^{\circ}[/tex] (because the initial light is horizontally polarized, while the axis of the filter is 25 degrees from the vertical

So, the power of the laser beam emerging from the filter is

[tex]P=(200 mW) cos^2 65^{\circ}=35.7 mW[/tex]

The power of the laser beam as it emerges from the polarizer is approximately 35.7 mW, as calculated using Malus's Law.

The power P' of a light beam after passing through a polarizer can be determined by Malus's Law:

where P is the initial power of the light, θ is the angle between the light's initial polarization direction and the axis of the polarizer.

In this case, the light is horizontally polarized and the axis of the polarizer is 25° from vertical, so the angle θ we need is the complement of 25°, which is 65° (since 90° - 25° = 65°).

Plug in the given values: P = 200 mW and θ = 65° into the equation, we get:

Solving this you get: P' = 35.7 mW

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Answer: Isotopes of an element will contain the same number of protons and electrons but will differ in the number of neutrons they contain. In other words, isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.

Answer:

A virtual image is formed at the position from which the rays appear to have originated

Explanation:

When using lenses or mirrors to produce the image of an object, two types of images can be produced:

- Real image: a real image is produced when the rays of light actually converge to a point - in this case, the image can be projected on a screen. For a lens, a real image is located on the opposite side of the lens relative to the object, while for a mirror, a real image lies on the same side of the object with respect to the mirror

- Virtual image: a virtual image is formed at the position from which the rays appear to have originated. Because of that, a virtual image cannot physically be projected on a screen. For a mirror, a virtual image is located on the opposite side of the mirror relative to the object, while for a lens, a virtual image lies on the same side of the object with respect to the lens.

Answer:

C. one magnet with a north pole and a south pole

Explanation:

this is possible because the triceps muscle applies an upward force m perpendicular to the arm, as the drawing indicates. the forearm weighs 20.0 n and has a center of gravity as indicated. the scale registers 118 n. the magnitude of m it run 10 miles.

Force is a parameter which can be used during  pushing or pulling of any object resulting in the object’s interaction or movement, without force the object can not function properly and it can be stopped the direction.

Force is a  quantitative property between two physical bodies, means an object and its environment, there are different types of forces in nature.

If an object in its moving state then that object will be  static or motion, and The external push or pull upon the object called as Force.

The contact force types effort on an object such as Spring Force, Applied Force, Air Resistance Force, Normal Force, Tension Force, Frictional Force

Non-Contact forces are Electromagnetic Force, Gravitational Force, Nuclear Force

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The magnitude of the triceps muscle force M needed to maintain static equilibrium of the forearm is 138 N, which balances the weight of the forearm and the force registered on the scale.

To solve for the magnitude of the force applied by the triceps muscle, M, we must take into account the principles of static equilibrium. In static equilibrium, the sum of all forces acting on the object is zero because it is not moving. Given that the forearm weighs 20.0 N, and the scale registers a downward force of 118 N, we know that there is an upward force required to balance the system and maintain equilibrium.

Let's establish an equation for the vertical forces acting on the forearm:

Since the forearm is in equilibrium, the upward force must balance the downward forces:

M = 138 N

Therefore, the magnitude of the force M applied by the triceps muscle is 138 N.

Answer:

55 mA

Explanation:

Ohm's law states:

V = IR

where V is voltage, I is current, and R is resistance.

220 V = I (4000 Ω)

I = 0.055 A

I = 55 mA

Answer:

[tex]2.74\cdot 10^{14} Hz[/tex]

Explanation:

First of all, let's convert the energy gap from eV to Joules:

[tex]E=1.14 eV \cdot (1.6\cdot 10^{-19}J/eV)=1.82\cdot 10^{-19}J[/tex]

In order to promote the electron to the conduction band, the electron must absorb a photon with an energy at least equal to the energy gap, so:

[tex]E=hf=1.82\cdot 10^{-19}J[/tex]

where

h is the Planck constant

f is the frequency of the photon

Solving for f, we find the lowest frequency needed:

[tex]f=\frac{E}{h}=\frac{1.82\cdot 10^{-19} J}{6.63\cdot 10^{-34}Js}=2.74\cdot 10^{14} Hz[/tex]

The lowest frequency photon that will promote an electron in silicon from the valence band to the conduction band is approximately 1.72 x 10^14 Hz.

To find the lowest frequency photon that will promote an electron in silicon from the valence band to the conduction band, we need to determine the energy difference between the two bands. The energy gap for silicon at 300 K is given as 1.14 eV. Since energy is directly proportional to frequency, we can use the equation E = hf, where E is the energy, h is Planck's constant (6.63 x 10^-34 J s), and f is the frequency. Rearranging the equation gives f = E/h. Plugging in the energy gap for silicon and Planck's constant, we can calculate the lowest frequency photon.

f = (1.14 eV) / (6.63 x 10^-34 J s) = 1.72 x 10^14 Hz

Therefore, the lowest frequency photon that will promote an electron in silicon from the valence band to the conduction band is approximately 1.72 x 10^14 Hz.

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Final answer:

In comparing isobaric, isothermal, and adiabatic processes for an expanding ideal gas, the isobaric process involves the greatest work done by the gas and the largest heat flow into the system, while the adiabatic process leads to a decrease in internal energy, indicating no heat flow into the gas.

Explanation:

An ideal gas expands through three different processes: isobaric, isothermal, and adiabatic, with its volume increasing to four times the original. Here's how each process impacts the work done, internal energy, and heat flow into the gas:

Isobaric (constant pressure): This process results in a significant work done by the gas and sees a large amount of heat flow into the gas due to the direct relationship between heat added and work done at constant pressure.

Isothermal (constant temperature): In this process, the internal energy of the gas does not change since any heat added to the system is entirely converted into work. Therefore, this process neither increases nor decreases the internal energy but can involve significant work done if heat is supplied.

Adiabatic (no heat exchange): This process results in a decrease in internal energy since the work done by the gas comes from its internal energy reservoir. No external heat is added to the system.

Answers to specific questions:

The work done by the gas is greatest during the isobaric process due to the direct relationship between pressure, volume, and work in this scenario.

The smallest amount of work done is a bit nuanced since all processes involve work, but the adiabatic process might be seen as involving 'less effective' work since it leads to a reduction in internal energy without heat intake.

The internal energy increases during isobaric expansion due to the heat flow into the gas.

The internal energy decreases during the adiabatic process as the gas does work on its surroundings at the expense of its internal energy.

The largest amount of heat flows into the gas during the isobaric process because work done on the gas directly translates to heat intake at constant pressure.

Answer:

Explanation:

You can always  figure out something to say about a question like this if you have a formula to work with. Likely you do.

There are many ways it can be written

R = k * L / A

So here's the answer.

Resistance = k  which depends of the properties of the material used to make the wire * the  Length of the wire  divided by the cross sectional area of the wire.

The electrical resistance of anything depends on its physical dimensions (length and cross-section area of a wire), and the substance of which it's composed.