two converging lenses of focal lengths 100 cm and 10 cm are combined to form an astronomical telescope. its magnification is

The speed the spy satellite must have to maintain this orbit is approximately 3077 m/s.

What is Speed?

Speed is a measure of how fast an object is moving, defined as the distance traveled per unit of time. It is a scalar quantity, meaning it only has a magnitude (i.e., a numerical value) and no direction.

The speed required for an object to maintain a circular orbit around the Earth can be calculated using the formula v = √(GM/r), where G is the gravitational constant, M is the mass of the Earth, and r is the distance between the center of the Earth and the object. Plugging in the given values, we get v = √((6.67×\(10^{-11}\) \(Nm^{2}\)/\(kg^{2}\)) × (5.97×\(10^{24\) kg) / (2400 km + 6371 km)) = 3077 m/s.

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The answer is (A.) The sail is pushing the wind back and slowing down the air. The wind is pushing the sail and the sail pushes the wind back and slows the air down.

As the boat is sailing, the wind will be faster than the boat. This fast wind is obstructed by the sail. That is, the fast wind gets slowed down by the sail because the sail pushes the wind backwards which slows down the wind. This will make the wind push the boat forward thereby accelerating the boat.

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Answer:

Options (3) and (6)

Explanation:

Janine drives 2.2 km East.

Since, distances measured in the East are positive,

Displacement = 2.2 km

Then she drives 4.4 km west

Displacement = -4.4 km

Followed by 1.7 km in the East

Displacement = 1.7 km

Total displacement = 2.2 - 4.4 + 1.7 = -0.5 km

\(\overrightarrow{d}=-0.5\) km

Total distance covered by Janine = 2.2 + 4.4 + 1.7 = 8.3 km

d = 8.3 km

Therefore, Options (3) and (6) will be the answer.

Answer:

b. compensate for changes in the Earth's atmosphere and achieve better resolution.

Explanation:

Inside a room at a uniform comfortable temperature, metallic objects generally feel cooler to the touch than wooden objects do. This is because metal conducts heat better than wood, so the correct option is (e) metal conducts heat better than wood.

Heat refers to the transfer of energy that arises from a difference in temperature. When two items are brought into touch, the item with more thermal energy (greater heat) transfers heat to the one with less thermal energy (less heat) until they are both at the same temperature. This means that heat flows from the warmer item to the cooler one.

Metal is an excellent conductor of heat. As a result, metallic objects usually feel colder to the touch than wooden objects. When you touch a metallic object, it can absorb heat energy from your skin more quickly than wood, making you feel cold. This process can happen much faster than if you touched a wooden object because wood is a poor conductor of heat.

Therefore, this is because metal conducts heat better than wood. Hence, option e) is correct.

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Answer:

a) The specific heat capacity means the amount of heat needed by a unit mass of a material to increase its temperature in one unit.

b) Liquid P - \(Q = 3840\,J\), Liquid Q - \(Q = 5500\,J\), Liquid R - \(Q = 7800\,J\), Liquid S - \(Q = 2856\,J\)

Explanation:

a) The specific heat capacity means the amount of heat needed by a unit mass of a material to increase its temperature in one unit.

b) Let suppose that heat transfer rates between liquids and surroundings are stable. The quantity of the heat released is determined by the following expression:

\(Q = m\cdot c\cdot (T_{r} - T_{f})\) (1)

Where:

\(m\) - Mass of the liquid, in kilograms.

\(c\) - Specific heat capacity, in joules per kilogram-degree Celsius.

\(T_{r}\) - Initial temperature of the sample, in degrees Celsius.

\(T_{f}\) - Freezing point, in degrees Celsius.

Liquid P (\(m = 1\,kg\), \(c = 160\,\frac{J}{kg\cdot ^{\circ}C}\), \(T_{r} = 30\,^{\circ}C\), \(T_{f} = 6\,^{\circ}C\))

\(Q = (1\,kg)\cdot \left(160\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (30\,^{\circ}C - 6\,^{\circ}C)\)

\(Q = 3840\,J\)

Liquid Q (\(m = 1\,kg\), \(c = 220\,\frac{J}{kg\cdot ^{\circ}C}\), \(T_{r} = 30\,^{\circ}C\), \(T_{f} = 5\,^{\circ}C\))

\(Q = (1\,kg)\cdot \left(220\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (30\,^{\circ}C - 5\,^{\circ}C)\)

\(Q = 5500\,J\)

Liquid R (\(m = 1\,kg\), \(c = 300\,\frac{J}{kg\cdot ^{\circ}C}\), \(T_{r} = 30\,^{\circ}C\), \(T_{f} = 4\,^{\circ}C\))

\(Q = (1\,kg)\cdot \left(300\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (30\,^{\circ}C - 4\,^{\circ}C)\)

\(Q = 7800\,J\)

Liquid S (\(m = 1\,kg\), \(c = 102\,\frac{J}{kg\cdot ^{\circ}C}\), \(T_{r} = 30\,^{\circ}C\), \(T_{f} = 2\,^{\circ}C\))

\(Q = (1\,kg)\cdot \left(102\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (30\,^{\circ}C - 2\,^{\circ}C)\)

\(Q = 2856\,J\)

The force of air resistance acting on the parachutist is given by \(\(F_{\text{air}} = -kv_a\)\)

At time \(t=0\), a parachutist with a weight of magnitude \(mg\) is at position \(x=0\) and is moving downward with a speed of \(v_a\). The force of air resistance acting on the parachutist can be calculated using the equation:

\(\(F_{\text{air}} = -kv_a\)\)

where \(\(F_{\text{air}}\)\) is the force of air resistance, \(\(k\)\) is a constant that depends on the shape and size of the parachutist, and \(\(v_a\)\)is the velocity of the parachutist.

The negative sign indicates that the force of air resistance acts in the opposite direction to the motion of the parachutist, which opposes the downward motion. As the parachutist continues to fall, the force of air resistance increases, eventually balancing out the force of gravity and causing the parachutist to reach a terminal velocity, where the net force acting on the parachutist becomes zero.

It's important to note that the magnitude of the force of air resistance depends on the speed of the parachutist. As the speed increases, the force of air resistance also increases, until it reaches a maximum value at the terminal velocity.

In summary, the force of air resistance acting on the parachutist is given by\(\(F_{\text{air}} = -kv_a\),\) where \(\(k\)\) is a constant and \(\(v_a\)\) is the velocity of the parachutist. The force of air resistance opposes the downward motion of the parachutist and increases as the speed increases.

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Complete Question:

At time t = 0, a parachutist having weight of magnitude mg is located at z = 0 and is traveling vertically downward with velocity Vo. If the force of air resistance acting on the parachute is proportional to the instantaneous speed, find the (a) speed, (b) distance traveled and (c) acceleration at any time t > 0.

Answer:

The force felt is the same

Explanation:

Answer:

As the person moves down the zip wire, her increase in kinetic energy is less than her decrease in gravitational potential energy.

Explanation:

Work is done against the air resistance, causing thermal energy to transfer to the surroundings

The factors that affect the kinetic energy of the person as she reached the bottom will be gravitation, mass, and speed.

Kinetic energy simply means the energy that is possessed by a body due to its motion. It should be noted that when work is done on an object, it speeds up and then gains kinetic energy.

From the complete information, factors that affected the kinetic energy of the person as she reached the bottom of the zip wire include gravitation, mass, and speed.

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Meteorologists can distinguish a cold from a warm front because a cold front occurs when a cold air mass advances and replaces a warmer air mass, resulting in cooler temperatures and often stormy weather. On the other hand, a warm front exists where a warm air mass moves over and replaces a cooler air mass, resulting in a gradual increase in temperature and often steady rainfall.

A cold front occurs when a cold air mass advances into a region occupied by a warm air mass. As the cold air mass moves forward, it lifts the warm air mass, causing the warm air to cool and condense into clouds. This can result in the formation of thunderstorms and other types of precipitation, and often brings a rapid drop in temperature.

A warm front, on the other hand, exists where a warm air mass advances into an area occupied by a cooler air mass. As the warm air mass moves forward, it rises over the cooler air mass, causing the warm air to cool and condense into clouds. This can result in the formation of steady rain or drizzle, and often brings a gradual rise in temperature.

In summary, meteorologists can distinguish a cold front from a warm front based on the direction in which the air masses are moving and the temperature characteristics of each air mass.

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1) Cold fronts occur when a cold air mass moves into and replaces a warmer air mass.

This typically happens when a high-pressure system moves in, pushing cold air towards an area of low pressure.

2) As the cold air mass moves forward, it forces the warm air mass upwards, where it cools and condenses.

This creates clouds, which can lead to precipitation.

3) The boundary between the two air masses is called a front.

In a cold front, the front is the leading edge of the cold air mass.

4) The cold air behind the front is usually drier and colder than the air ahead of the front.

This can cause a sudden drop in temperature and a change in wind direction, which can result in severe weather conditions such as thunderstorms, strong winds, and even tornadoes.

5) Warm fronts, on the other hand, occur when a warm air mass moves into and replaces a colder air mass.

This typically happens when a low-pressure system moves in, drawing warm air from surrounding areas towards an area of lower pressure.

6) As the warm air mass moves forward, it rises over the colder air mass, where it cools and condenses.

This also creates clouds, which can lead to precipitation.

7) The boundary between the two air masses is again called a front, but in a warm front, the front is the leading edge of the warm air mass.

8) The warm air mass is usually more humid than the air ahead of the front.

This can cause a rise in temperature and a change in wind direction, which can result in milder weather conditions such as light rain, drizzle, or even fog.

By observing the characteristics of a front and the air masses behind it, meteorologists can make predictions about future weather patterns, which helps people prepare for potential weather hazards.

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Answer:

the action of investigating something or someone; formal or systematic examination or research.

Explanation:

This definition is provided by Oxford Languages

Answer:

Two electrons receive treacherous and formidable power when met while the atoms in the ball move slowly around with great space.

Explanation:

hope this helped!

Radial velocity method and Transit method are the techniques used to find extrasolar planets.

The techniques used to find extrasolar planets are based on various methods. The method used depends on the size of the planet being searched for, the distance of the planet from its star, and the type of star being observed.

Extrasolar planets are planets that exist outside our solar system. At the present moment, nearly 150 extrasolar planets have been found. There are different techniques used to find them.

These techniques include:

Radial velocity method:

This method is used to find planets that are close to their star. It measures the pull of the planet's gravity on its parent star, which causes the star to move back and forth in space. This movement is detected by the Doppler shift of the star's spectrum.

Transit method:

This method is used to find planets that pass in front of their parent star as seen from Earth. When a planet passes in front of a star, it blocks some of the star's light, causing a small decrease in the star's brightness. By measuring the amount of light that is blocked by the planet, astronomers can determine the size of the planet. Direct imaging: This method is used to find planets that are far from their star and are very large, like Jupiter. These planets are detected by taking a direct image of them with a telescope. This method is very difficult because the planet's light is very dim compared to the light of its parent star.

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To determine how fast the water is moving as it pours out of the hole, we can use Torricelli's law, which relates the speed of efflux (v) of a fluid from a small hole in a container to the height (h) of the fluid above the hole.

v = sqrt(2gh)

h = 0.23 m

g = 9.8 m/s^2

v = sqrt(2 * 9.8 * 0.23)

v ≈ 1.97 m/s

Torricelli's law states that the speed of efflux is given by the equation:

v = sqrt(2gh)

where g is the acceleration due to gravity (approximately 9.8 m/s^2) and h is the height of the fluid above the hole.

In this case, the height of the water in the bucket is given as 23 cm, which is equal to 0.23 m. The diameter of the hole is given as 4.0 mm, which is equal to 0.004 m.

Since the diameter is small compared to the height, we can assume that the water flow is nearly vertical and we can apply Torricelli's law.

Using the given values:

h = 0.23 m

g = 9.8 m/s^2

v = sqrt(2 * 9.8 * 0.23)

v ≈ 1.97 m/s

Therefore, the water is moving at a speed of approximately 1.97 m/s as it pours out of the hole.

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In order for an object to have a perfectly circular orbit, an object must have the exact speed to achieve the circular orbit.

A circular orbit is a circular path which an object continuously follow in the course of its movement.

The earth and planets have a circular orbit around the sun.

The circular orbit is maintained by a balance between centripetal and centrifugal forces.

Therefore, in order for an object to have a perfectly circular orbit, an object must have the exact speed to achieve the circular orbit.

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Answer:

it would be coal

Explanation:

coal is the most used energy source in many countries as of China , India and, the United States

Coal is a primary energy source used by power plants to generate electricity

Electricity generation plants convert the chemical energy of fuel into electricity. Coal, oil, natural gas and nuclear fuels are the energy sources most commonly used for generating electricity.

"Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests."

"A fundamental form of energy observable in positive and negative forms that occurs naturally (as in lightning) or is produced (as in a generator) and that is expressed in terms of the movement and interaction of electrons. "

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Answer:

the answer is 173 m/s

Explanation:

the the sound traveled from the dog to the building and back to the dog in 0.5 seconds, every second passes the sound travels 346 m/s but if half a second passes then we divide 346 by 2 and get 173 m/s.

Answer:hence, the force needed to accelerate the 1000kg car by 3m/s2 is 3000N

Explanation:

plz mark as brainlyist plz

The place theory of pitch perception "solves" the problem of frequency theory's inability to account for high pitched sound perception. the correct option is (c) the place theory.

7. High-amplitude light waves produce bright colors, whereas high-amplitude sound waves produce louder sounds.

Therefore, the correct option is (a) bright; louder.8. The point on the retina that contains only cones and is responsible for our sharpest vision is called the fovea.

Therefore, the correct option is (c) fovea.9. Rods are most sensitive to low-amplitude light waves and are less sensitive in dim light.

Therefore, the correct option is (b) in dim light; to low-amplitude light waves.10.

Myopia (or nearsightedness) results from images focused in front of the retina. Therefore, the correct option is (b) in front of the retina.11. The blind spot is the area where the optic nerve exits the eye.

Therefore, the correct option is (b) the area where the optic nerve exits the eye.12.

The color aftereffects phenomenon predicts that, after staring at a bright red rectangle for a period of time, you will see a green rectangle.

Therefore, the correct option is (c) green rectangle.13.

Most people with limitations in their color vision are not color blind, as the vast majority of people can see well over 40 million different colors. Therefore, the correct option is (b) Most people with limitations in their color vision are not color blind.14. The place theory of pitch perception "solves" the problem of frequency theory's inability to account for high pitched sound perception.

Therefore, the correct option is (c) the place theory.

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Answer:

51,834.1 Newtons.

Explanation:

To find the force required to accelerate an object, you can use the formula force = mass x acceleration. In this case, the force required to accelerate a 15 passenger van weighing 1955 kg at a rate of 26.82 m/s^2 would be 51,834.1 Newtons.

Answer:

13.2 meter

Explanation:

because the initial velocity was zero

Orbital velocity of satellite

\(v = \sqrt{ \frac{gm}{r} } \)

Radius of new orbit r' =6r

Thus new orbital velocity of satellite:

\(v = \sqrt{ \frac{gm}{6r} } = \frac{v}{ \sqrt{6} } \)

For satellites in circular orbits, the relationship between orbital velocity and altitude is strict. The task of a satellite launch rocket is to release the satellite at a suitable place in space, with the appropriate speed and direction of movement to put it in the desired orbit.

How a satellite stays in orbit can be thought of in two equivalent ways, both of which explain the relationship between the satellite's altitude and velocity.

The motion of the satellite can be seen as creating a centrifugal force that opposes the gravitational pull. For example, imagine attaching an object to a string and swinging it in a circle. The object is pulling outward against the string, and that outward force (centrifugal force) becomes greater the faster the object swings. At the right speed, the centrifugal force of the satellite due to motion around the earth just balances the gravitational pull, and the satellite remains in orbit.

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13.02 meters

Explanation

the work done by the brakes makes the car stops, so the change in energy equals the work done

hence

also, the work done by a force is given by

then, let

replace

therefore, the answer is

13.02 meters

I hope this helps you

The true statements are:Jupiter's Great Red Spot is in the southern hemisphere.The fastest wind speed recorded in our solar system is on Neptune.

Among the given statements, only two are true. Jupiter's Great Red Spot, a massive storm, is indeed located in the southern hemisphere of the planet. The Great Red Spot is a prominent feature on Jupiter, visible as a giant swirling storm system. On the other hand, the fastest wind speed recorded in our solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour), is found on Neptune.

The strong winds on Neptune contribute to its dynamic atmosphere and the formation of features like the Great Dark Spot. The remaining statements about Pluto, Saturn's moon Enceladus, and Uranus are not true according to our current understanding.

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Answer:

t = 160 minutes

Explanation:

Given that,

Distance of Uranus from Sun is \(2.88\times 10^9\ km\)

We need to find the time taken by the light to go from sun to Uranus if the velocity of light is constant in free space and it is equal to c.

So,

\(t=\dfrac{d}{v}\\\\t=\dfrac{2.88\times 10^9\times 10^3\ m}{3\times 10^8}\\\\t=9600\ s\)

Since, 1 minute = 60 seconds

t = 160 minutes

So, 160 minutes is taken by the light.

The work done by the force of 9 Newtons over a distance of 10 meters is 90 Joules.

To calculate the work done by the force, we need to use the formula:

Work = Force x Distance x cos(theta)

where theta is the angle between the force vector and the displacement vector.

In this case, the body is moving horizontally, so the angle between the force vector and the displacement vector is 0 degrees. Therefore, cos(theta) = cos(0) = 1.

We are given that the force acting on the body is 9 Newtons, and the distance moved by the body is 10 meters.

Substituting these values into the formula, we get:

Work = 9 N x 10 m x cos(0)

Work = 90 Joules

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The distinction between mass and weight is that mass measures inertia while weight measures force.

The force acting on an object owing to acceleration or gravity is defined as its weight. Weight is defined as a vector quantity in certain standard textbooks, as the gravitational force exerted on the item. Others define weight as a syllable.

What is Mass?

A body's mass is an intrinsic attribute. Until the discovery of the atom and particle physics, it was thought to be tied to the amount of matter in a physical body.

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