(a) Electric room heaters use a concave mirror to reflect infrared (IR) radiation from hot coils. Note that IR follows the same law of reflection as visible light. Given that the mirror has a radius of curvature of 50.0 cm and produces an image of the coils 3.00 m away from the mirror, where are the coils?
(b) Find the magnification of the heater element in (b). Note that its large magnitude helps spread out the reflected energy.

Answer:

By Gauss' Law the sphere will appear externally as if all of the charge were concentrated at the center of the sphere.

E = K Q / r^2 = K Q / .528^2

Q = 1710 * .528^2 / 9.00E9 Coulombs

Q = 5.30E-8 Coulombs on sphere

V = 4/3 π R^3 = 4/3 π * .384^3 = .237 m^3

ρ = Q / V = 5.30E-8 / .237 = 2.23E-7 C/m^3

At .223 from center Q = 4/3 π .223^3 * ρ  (charge outside this radius will not affect electric field outside .223 m)

Q = 2.23E-7 * 4/3 * π * .223^3 = 1.04E-8 Coulombs

E = 9.00E9 * 1.04E-8 / .223^2 = 1880 N/C

Answer: 1 m/s

Explanation: 1 km = 1000 m (1 kilometer is equal to 1000 meters)

1 hour = 3600 seconds (1 hour is equal to 3600 seconds)

Answer:

Joules

Explanation:

Potential energy is energy an object has because of its position relative to some other object. ... Notice that gravitational potential energy has the same units as kinetic energy, kg m2 / s2. In fact, all energy has the same units, kg m2 / s2, and is measured using the unit Joule (J).

11.The time at 75° East longitude would be 1 hour and 20 minutes behind. 12.The time at 135° degrees East longitude would be 4 hours ahead. and 13. the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM.

At 2:00 AM at 90° East longitude, the time at 75° East longitude would be 1 hour and 20 minutes behind. This is because for every 15 degrees of longitude, there is a time difference of approximately 1 hour. Since the two longitudes in question have a difference of 15 degrees, we can divide this by 15 to calculate the time difference.

If it is 8:00 PM at 15° East longitude, the time at 135° East longitude would be 4 hours ahead. Similarly, for every 15 degrees of longitude, there is an approximate time difference of 1 hour. Since the two longitudes in question have a difference of 120 degrees, we can divide this by 15 to calculate the time difference.

There is a 7-hour difference** between 105° West longitude and the Prime Meridian (0° longitude). The Prime Meridian, passing through Greenwich, England, serves as the reference point for determining time zones. As one moves westward from the Prime Meridian, each 15 degrees of longitude corresponds to a time difference of approximately 1 hour. Therefore, the time at 105° West longitude would be 7 hours behind the time at the Prime Meridian.

If it is 9:30 AM in New York (41° North latitude, 75° West longitude), the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM. The latitude does not affect the time difference between the two locations. However, since both locations have the same longitude (75° West), they would experience the same local time. The time difference between different latitudes is primarily significant for determining time zones rather than the actual time within a specific time zone.

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Answer:

Sound

Explanation:

A sound wave is a pressure wave; regions of high pressure (compressions) and low pressure (rarefactions) are established as the result of the vibrations of the sound source.  

The correct answer is option A.

To stop your vehicle when the brakes fail, work the parking brake gradually to prevent locking up the wheels and sending the car out of control.

Due to advanced technology, a complete brake failure has never occurred. However, there is the possibility of an unlikely scenario while driving your vehicle.

If you ever come across such an unfortunate situation where a brake failure occurs in your vehicle while driving here is the advice to act upon.

The few things which are essential to do are:

Keep pressing the brake pedal

Gradually pull down on the parking brake of your vehicle.

If it does not work, shift your attention to the lower gear and make sure one gear at a time to slow down your vehicle.

Drive into less hazardous areas make sure there are no people around you and do not turn off your engine until your vehicle is completely stopped.

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Answer:

Explanation:

KHAN ACADEMY

Free body diagram of a block of cheese is sliding up an inclined surface that is not smooth is shown in the diagram.

A graphic, dematerialized, symbolic representation of the body (a structure, element, or fragment of an element) in which all connecting "parts" have been eliminated is known as a free-body diagram.

Force acting on the block is F in upward direction and frictional force acting on the body in opposite to the motion is f. and weight of the body is mg. and normal reaction of the body is R = mgsinθ. where, θ is angle of inclination of the surface.

Then, free body diagram is according to the figure.

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Answer:

A pardon

Explanation:

Hope this helps

Answer:

that would probably be a A.Pardon

Answer:

Explanation:

Given:

m = 2.0 kg

Wk = 225 J

__________

H - ?

Wp = m*g*H

Wp = Wk

m*g*H = 225

H = 225 / (m*g) = 225 / (2.0*9.8) ≈ 11,5 m

Answer:

1kg steam will have the maximum energy

The spectrum observed from the Sun (or any star) would exhibit an absorption spectrum. This is because the outer gaseous atmosphere of the star absorbs specific wavelengths of light, resulting in dark absorption lines in the spectrum.

In the cooler, lower-density outer atmosphere, where white light from the star travels, some atoms or molecules in the atmosphere absorb photons with particular energy. In the spectrum, these absorptions show up as black lines at specific wavelengths. The specific set of absorption lines that each element or molecule generates results in a distinctive pattern that can be used to identify the elements that are present in the star's atmosphere.

The absorption spectrum offers insightful data on the chemical make-up and physical characteristics of the star. Astronomers can ascertain the elements present, their abundances, and other characteristics like the temperature, pressure, and velocity of the star's atmosphere by examining the absorption lines.

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Answer:

the car

Explanation:

An object's volume is the amount of space it occupies. Cubic meters are used to measure large volumes (m3). Centimeters cubed are used to measure smaller volumes (cm3).

The design-limiting attributes must reach or exceed target values in order to deliver the desired degree of performance. Volume is a three-dimensional measurement that's used to gauge a solid shape's capacity. It implies that the volume of a closed form determines how much space it can occupy in three dimensions. The capacity of an object is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim. The quantity of space occupied by a three-dimensional object can also be used to describe volume.

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Answer:

The answer is 1400 J, according to my Physics teacher.

Explanation:

You need to take into account everything that is listed in the question; it's important to remember that the question is asking about the change in gravitational potential energy of the object-object-Earth system from 0s to 10s, not 0s to 20s. :)

The current reverses direction for the first time at the point when the alternating current (AC) waveform reaches its peak and starts decreasing toward the zero-crossing point.

In an AC circuit, the current changes direction periodically due to the alternating nature of the voltage source. The process can be better understood by examining the sinusoidal waveform of the AC current.

Initially, the current increases from zero to its maximum positive value (peak), following the positive half-cycle of the sine wave. As the waveform peaks, the current begins to decrease until it reaches zero again. This point, known as the zero-crossing point, signifies the moment when the current is about to change direction.

Once the waveform passes the zero-crossing point, the current increases in the negative direction, reaching its maximum negative value (negative peak) and completing the negative half-cycle. The current then decreases to zero, crossing the zero point again and reversing direction to start a new positive half-cycle.

In summary, the current reverses direction for the first time when it reaches the zero-crossing point after completing the positive half-cycle of the AC waveform.

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Answer:

【 In vector form , if angle between velocity vector and acceleration vector is less than 90° and greater than 0° then it is positive acceleration and if it is less than 180° and greater than 90° then it is negative acceleration. If there is no acceleration vector then it is called zero acceleration. 】

The type of image is formed by a lens if m = -1.6 is (d) The image is smaller than the object and is virtual.

If the magnification produced by a lens is negative, it means that the image formed by the lens is inverted with respect to the object. The sign of the magnification also indicates whether the image is larger or smaller than the object, and whether it is real or virtual.

In this case, since m = -1.6 is negative, the image is inverted with respect to the object. To determine whether the image is larger or smaller than the object, we look at the absolute value of the magnification, |m|. Since |m| > 1, the image is larger than the object.

Finally, to determine whether the image is real or virtual, we look at the sign of the magnification. Since m is negative, the image is virtual.

Therefore, the correct answer is (d) The image is smaller than the object and is virtual.

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Answer:

Yes

Explanation:

You can tell that your vehicle is equipped with an Anti-Lock Braking System (ABS) if it has a yellow ABS malfunction lamp on the instrument panel.

Answer:

The answer would be Mercury.

Explanation:

Due to its fast travel across the sky, the planet has been given this name. Mercury was named for the fast-moving messenger god of Rome. The planets received their names from the ancient Greeks because they believed that the moving stars in their night sky were their gods going about their activity, so... the planets were named after Roman gods.

Hope this helps! :D

Given :

Initial velocity, u = -15 m/s.

Acceleration , a = 2 m/s².

Time taken to applied brake, t = 2.5 s.

To Find :

The velocity of the car at the end of the braking period.

How far has the car moved during the braking period.

Solution :

By equation :

\(v = u+at\\\\v=-15 + 2\times 2.5\\\\v=-10 \ m/s\)

Now, distance covered by car is :

\(s=ut+\dfrac{at^2}{2}\\\\s=(-15)(2.5)+\dfrac{2(2.5)^2}{2}\\\\s=-31.25\ m\)

Hence, this is the required solution.

Answer:

i don't really know but i think yes sorry if it is wrong

The person on the spaceship would measure the time on your clock to be approximately 1.898 hours, or 1 hour and 53 minutes, when they whizzed past you.

According to special relativity, time can appear to be dilated (slowed down) for an observer who is moving at high speeds relative to another observer. This effect is known as time dilation.

The formula for time dilation is:

t' = t / sqrt(1 - v^2/c^2)

where t is the time measured by the observer at rest (in this case, you), t' is the time measured by the moving observer (in this case, the person on the spaceship), v is the relative velocity between the two observers, and c is the speed of light.

In this case, we have:

t = 1 hour (the time measured by you)

v = 0.85c (85% of the speed of light)

c = 3.00 x 10^8 m/s (the speed of light)

Plugging these values into the formula, we get:

t' = (1 hour) / sqrt(1 - (0.85c)^2/c^2)

t' = (1 hour) / sqrt(1 - 0.7225)

t' = (1 hour) / sqrt(0.2775)

t' = (1 hour) / 0.5268

t' ≈ 1.898 hours

So the person on the spaceship would measure the time on your clock to be approximately 1.898 hours, or 1 hour and 53 minutes, when they whizzed past you.

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Answer:

   I = 2.667 kg m²

Explanation:

The moment of inertia of a body can be calculated by the expression

         I = ∫ L² dm

For high symmetry bodies the expressions of the moment of inertia are tabulated, for a rod with its axis of rotation at its midpoint it is

         I = \(\frac{1}{12}\) m L²

let's calculate

         I = \(\frac{1}{12}\)  2  4²

         I = 2.667 kg m²

The object does not fall or it takes no time to fall according to the given information.

To determine how long it takes for the object to fall, we need to find the time at which the distance traveled (s) becomes zero. This represents the point at which the object hits the ground.

Given: s = 6t + 16t^2

To find the time at which s becomes zero, we set the equation equal to zero and solve for t:

0 = 6t + 16t^2

This equation is a quadratic equation in terms of t. To solve it, we can factor out a common factor of t:

0 = t(6 + 16t)

Setting each factor equal to zero, we have:

t = 0 (from the factor t = 0)

or

6 + 16t = 0 (from the factor 6 + 16t = 0)

Solving the second equation for t:

16t = -6

t = -6/16

t = -3/8

We discard the negative solution since time cannot be negative in this context.

Therefore, the object takes t = -3/8 seconds to fall. However, this negative value doesn't make physical sense in this context. Therefore, we can conclude that the object does not fall or it takes no time to fall according to the given information.

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The momentum of the red cart before the collision is 0.2 kgm/s and the blue cart is 0.

The momentum of the red cart after the collision is 0.05 kgm/s and the blue cart is 0.15 kgm/s.

The change in momentum of the system of the carts is 0.

The momentum of the carts before the collision is calculated as follows;

P(red) = 0.5 kg x 0.4 m/s = 0.2 kgm/s

P(blue) = 1.5 x 0 = 0

The momentum of the carts after the collision is calculated as follows;

P(red) = 0.5 x 0.1 = 0.05 kgm/s

P(blue) = 1.5 0.1 = 0.15 kgm/s

\(\Delta P = P_f - P_i\)

ΔP = (0.05 + 0.15) - (0.2)

ΔP = 0

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According to the illustration, the graphic illustrates the arrow and the intended target.

To target something or someone means to aim at them specifically. To aim a gun at a shooting range is an example of a target. To focus all of your efforts on one objective is an example of a target. verb. A target is an item or objective that is the subject of an aim.

Two or three arrows have been depicted in the green area of the image, which is located very distant from the red location. Given that they are all in the same location, this illustrates the idea of weak or low precision and excessive precession.

As a result, choice B is accurate.

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Answer:

it equals 53 miles per hour

It is to be noted that Wellington, New Zealand, is most likely to experience: "Four Distinct Seasons" (Option D)

The seasons in Wellington are:

A season is a division of the year that is based on variations in weather, ecology, and the number of daylight hours in a particular place. Seasons on Earth are caused by the axial parallelism of Earth's tilted orbit around the Sun.

Seasons have a huge impact on vegetation and plant development. Winter weather is often chilly, with little sunshine and restricted plant development. Plants grow, tree leaves unfold, and flowers bloom in the spring. Summer is the hottest season with the greatest daylight, therefore plants grow fast.

Winter in Wellington is very brief and mild, with only a few frosty days. Wellington's temperature seldom rises over 25°C (77°F) or falls below 6°C (43°F).

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Full Question:

The map below [see attached] shows the locations of two cities in the southern hemisphere: a world map showing the location of wellington, new Zealand, a city located in the southern hemisphere at about 41 degrees latitude.

Wellington, New Zealand, is most likely to experience:

one distinct season

two distinct seasons

three distinct seasons

four distinct seasons

The question is incomplete as it does not have the options which are:

deciduous forest

taiga (boreal forest)

temperate rainforest

tropical rainforest

Answer:

Taiga (boreal forest)

Explanation:

A Biome refers to the habitat which is occupied by flora and fauna living in similar conditions.  These biomes are distinguished based on many features like precipitation, temperature and many other physical factors.

In the given question, the biome which receives an annual rainfall of 35 to 100 cm annually and is mostly covered by the coniferous trees is known as "Taiga biome" which is also known as Boreal forest.

The Taiga biome is one of the largest terrestrial biomes which is present in Eurasia and North America. The biome is characterised by the conifers trees and therefore is also known as the Coniferous trees.

Thus, Taiga (boreal forest) is the correct answer.

Answer: Taiga(boreal forest)

Explanation: