an electron, moving south, enters a magnetic field of certain strength. because of this field the electron curves upward. what is the direction of the magnetic field?
A) towards the east
B) towards the west
C) upward
D) towards the north
E) downward

The speed of the wind is 17 mph and the speed of the plane in still air is 119 mph.

Let the speed of the plane be x and the speed of the wind be y. Then, the speed of the plane with the wind becomes x + y, while the speed of the plane against the wind is x - y.

The distance traveled with the wind in 3 hours is 408 miles.

Therefore, we can write the equation as:

3(x + y) = 408

Divide both sides by 3:

x + y = 136  .... (1)

The distance traveled against the wind in 4 hours is also 408 miles.

Therefore, the equation can be written as:

4(x - y) = 408

Divide both sides by 4:

x - y = 102  .... (2)

Now we can solve these two equations using the elimination method.

Add equations (1) and (2):

x + y + x - y = 136 + 1022x = 238x = 119 mph

Therefore, the speed of the plane in still air is 119 mph.

Now, substitute this value of x in equation (1):

119 + y = 136y = 17 mph

Therefore, the speed of the wind is 17 mph.

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The correct question is:

A plane flies 408 mi with the wind in 3 hr. The return trip takes 4 hr. What is the speed of the wind and the speed of the plane in still air?

If energy costs 10 cents per kWh, it will cost Rs. 30 to heat a tank of water for 80 minutes using a 3000 W immersion heater.

Hours Used Per Day: Indicate the average number of hours per day that the device is used. If the daily power usage is less than one hour, enter the number as a decimal. (For instance, 30 minutes a day equals 0.5)

Your home's water is heated by a water heater so that you can have hot water for your everyday needs. Modern, more efficient kinds of electric water heaters may only need to operate for two hours every day instead of the standard three hours. Around 4000 watts are typically required for a water heater.

Cost Per Hour: (3000*100*60)/(80*3600)

Cost Per Hour: 30.

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Correct Question:

Calculate the cost of heating a tank of water with a 3000 W immersion heater for 80 minutes if electricity costs 10 cents per kWh.

Answer:

Explanation:

Newton's Third Law states that "every action has an equal and opposite reaction". In a rocket, burning fuel creates a push on the front of the rocket pushing it forward. This creates an equal and opposite push on the exhaust gas backwards.

The percentage efficiency of the toy will be 23%. It is the ratio of the kinetic and elastic potential energy,

Elastic potential energy is the potential energy held when an elastic item is stretched or compressed by an external force, such as spring stretching.

It equals the work done to extend the spring, which is proportional to the spring constant k and the distance stretched.

Firstly, the kinetic energy is;

\(\rm KE = \frac{1}{2} mv^2 \\\\ \rm KE = \frac{1}{2} \times (150)(0.25)^2 \\\\ KE = 4.6875\ J\)

The elastic potential energy is;

\(\rm E=0.5\times 4\times 10 = 20\\ E=100 \ J\)

The percentage efficiency of the toy is found as;

\(\% \eta = \frac{4.6875 \times 100}{20} \\\\ \% \eta = 23 \% \\\\\)

Hence, the percentage efficiency of the toy will be 23%

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Swimming in a pool requires that you push back on the water in order to go forward is Newton's 3rd Law.

Newton's 3rd Law, also known as the law of action and reaction, states that for every action, there is an equal and opposite reaction. This means that if an object A exerts a force on object B, then object B will exert an equal and opposite force on object A.

For example, if you push against a wall, the wall will push back on you with the same force in the opposite direction. This is because every force is a result of an interaction between two objects, and each object exerts an equal and opposite force on the other.

This law is important in understanding how objects interact with each other and is fundamental to many areas of physics, including mechanics, fluid dynamics, and electromagnetism.

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The language of the given pushdown automaton (PDA) can be described as follows:

The PDA has a stack alphabet consisting of symbols 'a', 'b', 'z', '6', '1', '۸', '2', '9', '0', 'x', 'y'. 'z' represents the stack end symbol.

The transitions of the pushdown automaton (PDA) are as follows:

Thus, the language accepted by this PDA is characterized by a sequence of 'a's followed by a sequence of 'b's, where the number of 'b's is three times the number of 'a's, and each 'b' is followed by a corresponding sequence of '90', '91', '92', 'a', 'b', 'b', 'b', '1', 'b', 'b', '1', and ending with '1'.

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Creating and transmitting currents is central to the function of neuron physiology. This is true statement.

The neurons, which make up the nervous system's structural units, can be electrically excited. Numerous anatomically diverse types of nerve cells have developed to participate in numerous organismal processes.

The motor neurons in the spinal cord and brain receive signals from the spinal cord and brain that cause the muscles to start contracting, which affects the glands. A cell body and the neural processes, or axon and dendrites, make up the basic components of a neuron.

The voltage of neurons as they move from the soma, dendrites, and axon changes. In sensory neurons, external inputs open ion channels, causing action potentials to pass from the axon to the soma. The axons, which are the mechanism by which nerve cells communicate with one another neurons, are often used by neurons to transmit signals in the form of action potentials.

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Answer: B 100 J

Explanation: Pic Attached. Hope This Helps.

the answer is momentum.

The voltage is stepped up before being transmitted from a power station through overhead power lines to the consumer in order to reduce power loss and make the overhead power lines lighter, less expensive to build.

Here is the explanation why voltage is stepped up before being transmitted from a power station through overhead power lines to the consumer:

Power loss is inversely proportional to the square of the current. This means that if we can reduce the current, we can also reduce the power loss.

The current is inversely proportional to the voltage. This means that if we increase the voltage, we can reduce the current.

Therefore, by increasing the voltage, we can reduce the power loss.

In addition, the higher the voltage, the smaller the cross-sectional area of the conductors needed to transmit the same amount of power. This makes the overhead power lines lighter and less expensive to build.

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Answer:

In a longitudinal wave, the crest and trough of a transverse wave correspond respectively to the compression, and the rarefaction.

Explanation:

Car has a change in the  momentum equal to that of the rock but in the opposite to the direction.

Momentum is ability to keep increasing or developing.it is type of force that makes moves faster to very Faster.

According to the same conservation of Linear momentum, If the net of the external force acting on another system of bodies is definitely zero, then it is the  momentum of the system of  remains constant. We have to the   remember that they momentum of the system is conserved and not that of  the individual particles.

the car has a change in the  momentum equal to that of to the rock but in the opposite direction.

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The equation for the distance (d)  time zero (t = 0), is given by: d = -3t

The equation for the distance covered by the bug can be expressed as d = -3t, where d represents the distance traveled and t represents the time elapsed.

The negative sign in the equation indicates that the bug is moving in the negative direction along the number line. The coefficient of -3 represents the bug's velocity, which is -3 m/s.

This means that for each second that passes (t), the bug moves 3 meters in the negative direction.

If you'd like to delve deeper into the concept of distance-time equations, it would be beneficial to explore kinematics, a branch of physics that deals with the motion of objects.

By studying kinematics, you can gain a comprehensive understanding of how to mathematically describe the motion of various objects, including bugs crawling across a number line.

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The difference of time between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall would be 0.036s.

An echo is a reflection of sound that comes to the audience with a delay after the direct sound in audio signal processing and acoustics. The delay is directly proportionate to the separation between the source and the listener of the reflecting surface. One the kind audio effect that involves significantly delaying a signal is an echo effect. In this instance, after some period of time, listeners hear the same signal repeated clearly. When there is a noticeable delay in the sound, listeners can differentiate individual echoes.

The person seated in the middle row:

The distance sound traveled to middle row => 25/2 = 12.5m

The total distance the sound traveled to full length of auditorium and to the middle row => 25+12.5 => 37.5m

t1 => d1/v => 12.5/343 => 0.036s

t2 => d2/v => 25/343 => 0.072s

t2-t1 => 0.036s

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When two air masses of different density approach one another, the denser one goes over the less dense one. This is due to the fact that the denser air has a higher pressure than the less dense air, causing it to sink below the less dense air and form a boundary called a front.

The denser air mass contains more molecules per unit volume than the less dense air mass. The molecules in the denser air mass are therefore closer together and exert a higher pressure than the molecules in the less dense air mass. This causes the denser air mass to sink and slide underneath the less dense air mass, forming a boundary known as a front.

The opposite can occur when a warm air mass meets a cold air mass, as the warm air mass is less dense and rises above the colder, denser air mass.In conclusion, when two air masses of different density approach one another, the denser one goes over the less dense one due to differences in pressure. This can cause a front to form, bringing changes in weather and precipitation.

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Answer:

As a form of energy, heat has the unit joule (J). The standard unit for the rate of heat transferred is the watt (W), defined as one joule per second.

heat is a form of energy therefore the unit of heat is the same as that of energy has the CGS unit of heat is erg and its SI unit is Joule

relationship between Joule and erg is --

\(10 J = 10⁷ erg\)

other unit of heat are calories kilocolries

\(relationship \: between \: calorie \: and \: joule

1 calorie = 4 .18 \: j(or \: nearly \: 4.2 \: j \: ) \\ \\ 1 \: kilocalorie \: = 4.18 \: \times 10 \: cube \: j\)

In order to determine the mass of a planet using Newton's laws of motion and gravity, the planet must have at least one known orbiting object.

If we consider a planet with a moon orbiting around it, the moon is held in orbit by the gravitational force between the planet and the moon. By measuring the orbital parameters of the moon, such as the distance between the planet and the moon and the period of the moon's orbit, we can calculate the gravitational force acting on the moon.

We can then use Newton's law of gravitation to determine the mass of the planet, since the gravitational force depends on both the mass of the planet and the distance between the planet and the moon.

This method can also be applied to other objects in orbit around a planet, such as a spacecraft. By measuring the orbital parameters of the spacecraft, we can calculate the gravitational force acting on it and use this to determine the mass of the planet.

Therefore, in order to determine the mass of a planet using Newton's laws of motion and gravity, at least one known orbiting object whose orbital parameters can be accurately measured is required.

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Answer:

t = 0.4 s

Explanation:

Given that,

The speed of sound on steel is about 5000 m/s.

A friend of yours, 2000 m away, strikes a railroad track which you have your ear on.

We need to find the time after she strikes it will the sound arrive. Let the time is t. We know that,

Speed = distance/time

So,

\(t=\dfrac{d}{v}\\\\t=\dfrac{2000}{5000}\\\\t=0.4\ s\)

So, the required time is 0.4 seconds.

Answer:

C and D

Explanation:

A: is a simple composition

B: is a single replacement

C: C is a double displacement

D: is a double replacement

Answer:

The answers are C abd D.

Explanation:

Here,

A no. Is a combination or analysis chemical reaction.

B no.is a single displacement reaction as cl2 goes to zn.

C no. Is double displacement reaction.

D no. Is a double displacement reaction.

Hope it helps.....

The center of mass will be shifted slightly towards the heavier pieces, as they have more mass and therefore exert a stronger gravitational pull on the center of mass. The exact position of the center of mass will depend on the specific masses and positions of the pieces.

The explosion of the bomb results in the separation of the bomb into three pieces of mass 15 kg, 25 kg, and 35 kg, respectively. The center of mass of the system of these three pieces will still exist after the explosion, and its location will depend on the relative masses and positions of the three pieces.

Assuming that the explosion occurs in a way that the pieces are propelled away from the original location of the bomb with equal and opposite momentum, we can use the following equation to calculate the position of the center of mass:

Center of mass = (m1 x r1 + m2 x r2 + m3 x r3) / (m1 + m2 + m3)

Where m1, m2, and m3 are the masses of the three pieces, and r1, r2, and r3 are their positions relative to some chosen origin.

Since the pieces are propelled in equal and opposite directions, the net momentum of the system is zero. Therefore, the center of mass will remain in the same position as it was before the explosion.

However, the center of mass will be shifted slightly towards the heavier pieces, as they have more mass and therefore exert a stronger gravitational pull on the center of mass. The exact position of the center of mass will depend on the specific masses and positions of the pieces.

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The stone is moving horizontally at a 1.211m/s starting velocity.

From an 18.4 m tail cliff's peak, a stone is flung horizontally. In relation to the cliff's edge, the stone lands 22.3 metres away.

The starting horizontal velocity of the ball can also be determined by measuring the diameter d of the ball and dividing it by the time t it takes for it to cross the photogate. Voi = d/t, thus.

If time, acceleration, and ultimate velocity are known, the initial velocity is given by the equation u = v - at. (2) The equation u2 = v2 - 2 is applied as if the final velocity, acceleration, and distance are known. (3) In the case where a specific distance, acceleration, and time are specified, the initial velocity is.

Vo = d/t.

22.3 / 18.4 = 1.211.

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The appropriate term for each statement is as follows;

Weight is the force on an object due to the gravitational attraction between it and the Earth (or whatever astronomical object it is primarily influenced by).

Mass, on the other hand, is a quantity of matter cohering together so as to make one body, or an aggregation of particles or things which collectively make one body or quantity.

Weight is measured in Newton's because it is a force while mass is measured in kilograms. The weight is affected by the gravity of the planet the object exists.

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The final image is formed by two converging lenses at 15.3 cm in front of the second lens and the magnification of the system is -0.99.

To find the location of the final image, we can use the lens formula:

1/f = 1/do + 1/di

where f is the focal length of the lens, do is the object distance, and di are the image distance.

For the first lens, f = 14.8 cm and do = 30.0 cm. Plugging these values into the lens formula gives:

1/14.8 = 1/30 + 1/di

Solving for di, we get:

di = 20.1 cm

This means that the first lens forms an image 20.1 cm behind it, which serves as the object for the second lens.

Using the lens formula again for the second lens, f = 14.8 cm and do = 39.7 - 20.1 = 19.6 cm. Plugging these values into the lens formula gives:

1/14.8 = 1/19.6 + 1/di

Solving for di, we get:

di = 9.1 cm

Therefore, the final image is formed 9.1 cm behind the second lens.

To find the magnification of the system, we can use the formula:

m = - di/do

where m is the magnification, di is the image distance, and do is the object distance.

Plugging in the values we found, we get:

m = -9.1/30.0 = -0.303

Therefore, the magnification of the system is -0.303, which indicates that the image is inverted and smaller than the object.

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The output force on the piece of food the chopsticks pick up is mechanical advantage times 3 N.

The force amplified by utilising a tool, mechanical device, or machine system is known as mechanical advantage. To achieve the desired output force amplification, the gadget trades off input forces against movement.

Mathematically:

mechanical advantage = output force/input force

Given that input force = 3 N.

Hence, output force = mechanical advantage × 3 N.

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99.16 Newtons is the new force of attraction between the particles.

The forces that hold atoms together to create molecules and solids are referred to as chemical bonds. The attraction between the electrons of one atom and the nuclei of another atom as a result of this electric force is what is known as a chemical bond.

\(F = (kq1q2)/r^2\)

\(9,916 = (kq1q2)/r^2\)

\(F = (k*(q1/5)*(q2/5))/(2r)^2\)

\(F = (1/100)((kq1*q2)/(r^2))\)

So, the new force of attraction is:

\(F = (1/100)*9,916 = 99.16\)Newtons (rounded to 4 decimal places)

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Answer:

10000 Bq / 625 Pq = 16

Radioactivity has decreased by a factor of 16

2^4 = 16

So the sample has gone thru 4 half-lives

24 da / 4 = 6 da

6 da is the half-life

The frictional force opposes the forward motion of the crate. The coefficient of static friction is 0.2.

Using the formula;

Fa = - Ff + mgsinθ

but Ff = μsFN and N = mgcosθ

Hence;

Fa = mgsinθ - μsmgcosθ

μsmgcosθ = mgsinθ - Fa

μk =  mgsinθ - Fa/mgcosθ

μk =  coefficient of static friction = ?

Fa = horizontal force = 100N

m = mass = 30.6 kg

θ = angle = 30°

g = acceleration due to gravity = 10 m/s^2

Substituting values;

μk =  [(30.6 × 10) sin 30°] - 100 / (30.6 kg × 10) cos 30°

μk = 153 - 100/265

μk = 0.2

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The total magnification when using a 20x objective lens and a 10x ocular lens would be 200x.

To calculate the total magnification, we multiply the magnification of the objective lens by the magnification of the ocular lens.

Objective Lens: The objective lens is typically found on the nosepiece of a microscope and provides the primary magnification. In this case, the objective lens has a magnification of 20x.

Ocular Lens: The ocular lens, also known as the eyepiece, is located at the top of the microscope and further magnifies the image produced by the objective lens. The ocular lens in this scenario has a magnification of 10x.

Total Magnification: To find the total magnification, we multiply the magnification of the objective lens by the magnification of the ocular lens.

Total Magnification = Objective Magnification × Ocular Magnification

Total Magnification = 20x × 10x

Total Magnification = 200x

Therefore, the total magnification when using a 20x objective lens and a 10x ocular lens is 200x.

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