The density beyond which people cease to be nutritionally self-sufficient is called:________

c. A current is induced in the coiled wire, which lights the light bulb.

If we kept the bar magnet stationary and moved the coil back and forth within the magnetic field an electric current would be induced in the coil.

Then by either moving the wire or changing the magnetic field we can induce a voltage and current within the coil and this process is known as Electromagnetic Induction and is the basic principle of operation of transformers, motors and generators.

When the magnet shown below is moved “towards” the coil, the pointer or needle of the Galvanometer, which is basically a very sensitive center zeroed moving-coil ammeter, will deflect away from its center position in one direction only.

When the magnet stops moving and is held stationary with regards to the coil the needle of the galvanometer returns back to zero as there is no physical movement of the magnetic field.

Therefore ,

If you move a bar magnet back and forth along the axis of the coiled wire shown below then a current is induced in the coiled wire, which lights the light bulb.

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Answer:

B

Explanation:

Answer:

A description of position depends on a reference point because if the reference point changes than the distance and direction can change. Before the weight was moving two forces were acting on it

Explanation:

i hope this helps:)

<3

Explanation:

The expression for the magnetic field around the current carrying wire is given by :

\(B=\dfrac{\mu_o I}{2\pi r}\)

Here,

I is electric current and r is distance from the wire.

The factors affect the strength of magnetic field around current carrying wire are :

Answer:

Control Variable

Explanation:

The Control is a constant and not allowed to change.

During the collision of a planetesimal with a protoplanet, the kinetic energy of the planetesimal can be converted into different forms of energy.

Some of the energy may be converted into thermal energy due to the friction caused by the collision, resulting in an increase in temperature of the colliding bodies.

Additionally, some of the kinetic energy may be converted into potential energy, as the colliding bodies may move away from each other due to the collision.

The potential energy can later be converted back into kinetic energy if the bodies start moving towards each other again.

Finally, some of the energy can be radiated away as electromagnetic radiation, such as light or heat, depending on the specifics of the collision.

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The kettle with 3kW power taking 3 minutes to boil 500 cm³ of water perform a work of 540 KJ which is equivalent to the energy transferred by the kettle.

Power is the rate of work done by an object. Thus, power is the rate of work done. Work done on a body is equivalent to the energy of the body. Thus power is rate of energy too.

If a force applied on a body results in displacement, it is said to be work done on the body. The ratio of work done to the time is the power of the object.

P = w/t

then w = P t

Given that P = 3 kW for 3 minutes

3 minutes = 180 seconds

Then w = E = 3 × 180 = 540 KJ

Therefore, the energy transferred by the 3kW kettle in 3 minutes is 540 KJ.

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The energy stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1-mm air gap is 4.28 × 10⁻⁵ J.How much energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1-mm air gap.

We can determine the energy stored by the electric field between two square plates by using the formula;U = 1/2 CV²Here,U is the energy stored,C is the capacitance andV is the potential difference between the plates.Using the formula of capacitance, C = εA/d, where ε is the permittivity of the air, A is the area of the plates, and d is the distance between the plates.Substituting the values in the above equations we get;C = εA/d = (8.85 × 10⁻¹² C²/Nm²) × (0.079 m)² / (2.1 × 10⁻³ m) = 2.18 × 10⁻¹¹ F The potential difference between the plates,V = Ed, where E is the electric field.

So, E = V/d = 2V/0.079 mFrom Gauss' law, we know that the electric field between two parallel plates isE = σ/ε, where σ is the charge density.Substituting the values in the above equations we get;E = σ/ε = (ε0V/d)/ε0 = V/dTherefore, σ = ε0 V/d²Putting the values; σ = (8.85 × 10⁻¹² C²/Nm²)(2V)/(0.079 m)² = 3.66 × 10⁻⁵ C/m²The potential difference between the plates, V = Ed = (3.66 × 10⁻⁵ C/m²)(2)(0.079 m) = 5.8 × 10⁻⁶ V Therefore, the energy stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1-mm air gap is;U = 1/2 CV² = (1/2) (2.18 × 10⁻¹¹ F) (5.8 × 10⁻⁶ V)² = 4.28 × 10⁻⁵ J.

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Answer:

5)

Solution

initial velocity = 15 m/s

acceleration = 3m/s^2

time = 4 s

final velocity = 15+3×4

=15+12

=27m/s

A car accelerates from 20m/s to 30m/s in 10 second

T9 be honest I think some part of the second question is missing

Answer:

The answer for this question is B water vapor

Explanation:

just trust me bro

Answer:

the temperature increas

Answer:

the correct answer is reduce friction

The final velocity of the object after the force acts for 0.2 seconds is 20 m/s.  

To solve this problem, we can use the equation of motion, which is:

v(t) = v + at

here:

v(t) is the final velocity

v0 is the initial velocity

a is the acceleration

t is the time

Using this equation, we can find the final velocity after the force acts for 0.2 seconds.

First, we need to find the time t for which the force acts:

t = 0.2 seconds = 20 seconds / 60 seconds per second = 0.333 seconds

Next, we can plug in the values and solve for v(0.333):

v(0.333) = 20 + 0 * 0.333 = 20 m/s

Therefore, the final velocity of the object after the force acts for 0.2 seconds is 20 m/s.  

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The toy automobile has a momentum of 0.05 kg*m/s.

p = m v . The equation demonstrates that momentum is directly related to an object's mass (m) and velocity. (v). As a result, an object's momentum increases with increasing mass or velocity. The momentum of a large, swift object is larger than that of a small, slower item.

The formula for calculating an object's momentum (p) is the product of its mass (m) and velocity (v):

p = m * v

Plugging in the values given:

p = 0.1 kg * 0.5 m/s

p = 0.05 kg*m/s.

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We have that the  gravitational potential energy  effect on the system is mathematically given as

Option C

From the question we are told

Due to reduce in top of Y, doable strength will limit and due to amplify in peak of X, achievable power will increase.

Now, PE = mgh.

Generally the equation for the Velocity of centre of mass  is mathematically given as

\(V =\frac{ m1v1 + m2v2}{ m1 + m2}\\\\Therefore \\\\V =\frac{ (m1 - m2) v}{ m1 + m2}\)

Hence, V is positive as m1 > m2

Therefore

The conclusion

The gravitational potential energy decreases because the center of mass of Object X and Object Y moves downward.

Option C

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Objects X and Y are connected by a string of negligible mass and suspended vertically over a pulley of negligible mass, creating an Atwood’s machine, as shown in the figure.

The objects are initially at rest, and the mass of Object Y is greater than the mass of Object X. As Object Y falls, how does the gravitational potential energy of the Object Y-Object Y-Earth system change? All frictional forces are considered to be negligible.

a

The gravitational potential energy increases because the center of mass of Object X and Object Y moves upward.

b

The gravitational potential energy increases because the center of mass of Object X and Object Y moves downward.

c

The gravitational potential energy decreases because the center of mass of Object X and Object Y moves downward.

d

The gravitational potential energy decreases because the center of mass of Object X and Object Y moves upward.

Answer;

it can be incident ray.

As a result, the system's maximum spring potential energy U is given by: U = (2π^2MD^2)/P^2

Potential energy is the energy stored by an item as a result of its location relative to other objects, internal tensions, electric charge, or other reasons. Potential energy is stored energy that is affected by the relative location of various components in a system. When a spring is squeezed or extended, its potential energy increases. A steel ball has higher potential energy when lifted above ground than when it falls to Earth.

Here,

The maximum spring potential energy U can be calculated using the equation:

U = (1/2)kD^2

where k is the spring constant, which can be found from the period of oscillation using the equation:

k = (4π^2M)/P^2

Substituting the expression for k into the equation for U, we get:

U = (1/2)((4π^2M)/P^2) * D^2

So the maximum spring potential energy U of the system is given by:

U = (2π^2MD^2)/P^2

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When polychromatic visible light shines through a diffraction grating, the central maximum will be visible as a mixture of the wavelengths present. option c

A diffraction grating is an optical element that separates white light into its component colors using an array of equally spaced, parallel slits.

A beam of light is diffracted by the grating to produce a series of spectra, the brightest of which is called the central maximum, with the other spectra organized around it. The angles and intensity of the spectra are determined by the wavelength of the light being diffracted, as well as the spacing and number of slits on the grating. Hence, option c is correct.

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The number of turns in the solenoid is 10.08 x 10⁴.

Length of the solenoid, L = 0.5 m

Magnetic field, B = 9 T

Current flowing through the solenoid, I = 75 A

The magnetic field due to a current carrying solenoid,

B = μ₀NI/L

Therefore, the number of turns,

N = BL/μ₀I

N = (9 x 0.5)/(4\(\pi\) x 10⁻⁷x 75)

N = 10.08 x 10⁴

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Answer:

Below :)

Explanation:

It is the powerhouse of the cell and creates chemical energy.

Answer:

\(4 ms^{-2}\)

Explanation:

Normal force - should be the reaction from the surface it's on - nullifies the weight of the object. At this point the only force is of \(22-14 = 8N\) from whoever is pushing the square and the friction, towards the right. At this point we divide the force by the mass of the object to obtain an acceleration of \(8/2 = 4 ms^{-2}\)

the work done to raise a 25kg book to a 1.5 m shelf is 367.5J and the potential energy of the book will be 367.5

Work done by a force is equal to the scalar product of the force applied and displacement. If d displacement happens on applying a force F, then work done, W by the force is

W = F. d

given:

mass, m = 25 kg

height, d = 1.50 m

work has to be done against the weight of the book, F = mg

work done W = F. d

W = mgd

W = (25) ×(9.8)×(1.50)

W = 367.5 J

This work is stored as the potential energy of the book.

Therefore, the work done to raise a 25kg book to a 1.5 m shelf is 367.5J and the potential energy of the book will be 367.5J

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(a) The man comes to a halt in 1.99 ms = 1.99 × 10⁻³ s, so his average acceleration slowing him from 6.33 m/s to a rest is

a = (6.33 m/s - 0) / (1.99 × 10⁻³ s) ≈ 3180 m/s²

so that the average net force on the man during the landing is

F = (70.8 kg) a ≈ 225,000 N

i.e. with magnitude 225,000 N.

(b) With knees bent, the man has an average acceleration of

a = (6.33 m/s - 0) / (0.147 s) ≈ 43.1 m/s²

and hence an average net force of

F = (70.8 kg) a ≈ 3050 N

(c) The net force on the man is

∑ F = n - w = m a

where

n = magnitude of the normal force, i.e. the force of the ground pushing up on the man

w = the man's weight, m g ≈ 694 N

m = the man's mass, 70.8 kg

g = mag. of the acceleration due to gravity, 9.80 m/s²

a = the man's acceleration

Using the acceleration in part (b), we have

n = m g + m a = m (g + a)

n = (70.8 kg) (9.80 m/s² + 43.1 m/s²) ≈ 3740 N

The correct statement about Ti and Tz is (B) T1 = T2 because both blocks have the same acceleration.

Since the two blocks, with masses m1 and m2, are connected by a massless string, they must have the same acceleration due to Newton's Third Law of Motion (for every action, there is an equal and opposite reaction). The pulley, with mass m and rotational inertia I, is frictionless, meaning that it does not affect the tension in the string.

When the wheel is released from rest and starts rotating clockwise, the forces acting on the blocks are gravity and the tension forces T1 and T2 from the string. The blocks' acceleration is determined by the net force acting on them. As they are connected by the string, their acceleration must be the same, even though their masses are different. This is because the tension forces in the string are transmitted through the pulley without any loss, as the string does not slip and the axle is frictionless.

Therefore, T1 and T2 must be equal, since they are the forces responsible for the acceleration of both blocks. Other statements, such as the wheel's mass or the distance between the blocks and the wheel, are irrelevant to the tension forces and do not influence their relationship. In conclusion, the correct statement is that T1 = T2 because both blocks have the same acceleration. Therefore, Option B is correct.

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Diode is probably fault.

Diode is an electrical component which allows current to flow in one direction and heavy resistance in other direction.

           The working of diode is based on the p-n junction which have

           more electron and less hole if p-n junction is n-type and vice-versa.

There are various uses of diode in electric appliances.

 If the diode possess high resistances in both the directions then there is

 no flow of current. So, the diode must be fault .

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Photodetectors that rely on the external photoelectric effect are known as photoemissive detectors (sometimes spelled photoelectric detectors).

A photocathode of some kind is present in such a device, where incident light is partially absorbed to produce photoelectrons, which are released into free space.

The light reflected off of particles by a light beam inside the sensor chamber is used by smoke detectors to detect smoke. When there are no particles in the sensing chamber, the beam's light does not hit the light detector, signaling that everything is in order.

Ionization smoke alarms detect smoke from rapidly blazing fires, while photoelectric smoke detectors are best for detecting smoke from smoldering fires.

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The three main approaches to the identification of unknown bacteria are as follows:Phenotypic identification, Molecular identification and Biochemical identification

1. Phenotypic identification

Phenotypic identification involves the physical and chemical characteristics of the bacterial colonies and cells. In this method, bacterial cells are studied through microscopy, their ability to grow on various types of media, cellular morphology, and other factors that are easy to observe.

2. Biochemical identification

Biochemical identification is based on the biochemical reactions of bacteria. This method involves the use of different chemical and biochemical tests to identify the bacteria. The tests are designed to identify specific enzymes or metabolic pathways. The results of the tests are then used to identify the bacteria.

3. Molecular identification

Molecular identification involves the use of DNA analysis to identify bacteria. In this method, the DNA of the bacterial cells is isolated and analyzed. This method has become popular in recent years due to its accuracy and speed.

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Your driver's license is at risk of being cancelled if you have more than three traffic violations in one year​. The correct option is D.

The license by the central government to an individual to travel on road by his own vehicle on terms and conditions to be strictly followed.

When a driver is moving with his vehicle and come across the traffic signal, he must follow them. If he violates the traffic signals more than three times, he will get his license cancelled.

Thus, your driver's license is at risk of being cancelled if you have more than three traffic violations in one year​. The correct option is D.

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