the focal length of a simple magnifier is 8.50 cmcm . assume the magnifier to be a thin lens placed very close to the eye.

A constant force of 1.25N

Explanation:

This is a kinematics problem.

First find acceleration,

then use F = ma to find force.

Given:

mass = .5kg

delta x = 20m

t = 4s

a = ?

Friction = 0

From the kinematics equations:

delta x = Vi + (1/2)at^2

Plug in terms that are given:

20m = 0 + (1/2)a(4^2)

(2*20m)/(16s^2) = a

40m/(16s^2)= 2.5m/s^2

Now use F = ma to find force exerted on object.

F = (0.5kg)*(2.5m/s^2)

F = 1.25N

Answer:

B:O

Explanation:

As acceleration is the rate of change of velocity with time, if velocity is uniform, there will be no change in it and acceleration will be zero.

The nucleus of an atom will have a positive charge due to the existence of protons, which are positively charged subatomic particles.

Protons and neutrons are present in an atom's nucleus. We are aware that a proton has a charge of + 1 and a neutron has a charge of 0 (or no charge). As a result, the atom's nucleus will always be positively charged. A nucleus is a name for the dense area in the middle of an atom. Because there are positively charged subatomic particles present, the nucleus usually has a positive charge. The subatomic particles, which are present in atoms but far smaller than atoms, are there. Protons, neutrons, and electrons are the three primary subatomic particles found in matter. An atom's nucleus contains protons and neutrons, while its outermost nucleus contains electrons. Neutrons are subatomic particles with a charge of zero, whereas protons are positively charged.

Therefore, the nucleus of an atom will always have a positive charge. Consequently, an atom's nucleus has a positive charge because of the presence of protons.

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Answer:

Hi can you explain more to the question your tryna ask us

Explanation:

you can do that in my comments

Answer:

?

Explanation:

amplitude, in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. ... Waves are generated by vibrating sources, their amplitude being proportional to the amplitude of the source.

Period refers to the time that it takes to do something. ... The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years.

.Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time. ... An object with no movement at all has a zero speed.

wavelength, distance between corresponding points of two consecutive waves.

frequency refers to the number of waves that pass a fixed point in unit time. It also describes the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

Answer:

Explanation:

At t = 1 velocity = 0

At t = 3 velocity = 3

slope of the line = 3-0 / 3-1 = 3/2

At t = 2

velocity = 3/2 x ( 2 - 1 )

= 1.5 m /s

velocity at t = 2 is 1.5 m /s

Position at t = 2 :

displacement at t = 2

area of graph upto  t = 2

= 1 / 2 x 1 x 1.5 = .75

position at t = 2 :

= initial position + displacement

= 10 + .75 = 10.75 m

position at 6 s :

displacement at t = 6

area of curve upto  t = 6

= 1 / 2 x 2 x 3 +  3 x 3 + 1/2 x 3 x ( 4.5 - 3 )

= 3 + 9 + 2.25

= 14.25 m

position at t = 6

= initial position + displacement

= 10 + 14.25 = 24.25 m

position at 9 s :

displacement at t = 9

area of curve upto  t = 9

= 1 / 2 x 2 x 3 +  4 x 3 + 1/2 x 4 x ( 5 - 3 )- 1/2 x 2 x 1.5

= 3 + 12 + 4 - 1.5

= 17.5  m

position at t = 9

= initial position + displacement

= 10 + 17.5 = 27.5  m

The temperature of the pressing comb and the amount of pressure used are adjusted based on the texture of the hair. length style texture cleanliness

Temperature is defined as the measure of the amount of hotness or coldness of the body. There are various units used to measure temperature. The most used temperature scales are Celsius, Fahrenheit and Kelvin.

Pressure is defined as the amount of force exerted per unit area. Pressure is expressed using a variety of units, some of these come from dividing a unit of force by a unit of area; the standard unit of pressure in the imperial system is the pound-force per square inch (psi), which is equivalent to one newton per square meter (N/m2) in the SI.

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Answer:

a and b

Explanation:

first one breaks it and second one directly makes it weaker

Answer:

A and B

Explanation:

took the test

Answer:

What are the answer choices?

Explanation:

Answer:

Explanation:

57.8 m/s

A 0.200kg ball is shot out of a toy gun from a height of 3.00m. The gun works by compressing a spring k=175N/m a distance of 0.400m. then the force applied to the ball is 70 N.

Simple harmonic motion is a specific kind of periodic motion of a body that arises from a dynamic equilibrium between an inertial force that is proportional to the body's acceleration away from the static equilibrium position and a restoring force on the moving object that is directly proportional to the magnitude of the object's displacement and acts towards the object's equilibrium position. Oscillating spring perform SHM.

Force applied on the spring is spring constant times distance.

F = kx

Given,

mass m = 0.2 kg

height h = 3 m

k = 175 N/m

x = 0.4 m

The force applied to the ball is,

F = kx

F = 175×0.4

F = 70 N

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If the rate constant, k, for the reaction A + B is 0.25 M-1 s-1 at 75 °C, Which of the following claims is true in light of the rate law, rate = k[A]2[B] The rate law for a reaction is Rate = (1.25 M2s1)[A][B]2.

rate=k[A]m[B]n[C]p…

In which k is the rate constant, which is unique to a certain reaction at a specific temperature, and [A], [B], and [C] indicate the molar concentrations of reactants. M, N, and P are typically positive integer exponents (although it is possible for them to be fractions or negative numbers).  

The rate of a reaction must be tracked experimentally when the reactant concentrations are varied in order to calculate the rate constant k and the exponents m, n, and p. The rate constant k varies with temperature and surface area but is independent of the concentration of A, B, or C.

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For a reaction, a → b, the rate law for the reaction is (0.25) [A] with the rate constant,k is 0.25 m⁻¹ s⁻¹.

The rate of the reaction defines the reactant concentration. It gives the relation between reactant and product. It gives the concentration of the reactant involved in the reaction.

The rate law is directly proportional to the rate constant of the reaction. The rate constant (k) gives the relation between the molar concentration of the reactant and the rate of the reaction.

The rate law is defined as, R= k [A]ᵃ[B]ᵇ, where R represents the rate law, k represents the rate constant, and [A], [B] represents the concentration of the reactant. a,b represents the order of reaction with respect to A  and B.

From the given,

The rate law,

R= k [A]

 = 0.25 [A]

Thus, the rate law of the reaction is 0.25[A].

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According to  the given statement The force exerted by the string on the object is 2.7 N.

Any item travelling in a circular direction has a tangential velocity, which is its linear speed. On a turntable, a point in the centre moves less distance in a full rotation than a point near the outside edge.

Tangential velocity is determined by dividing the circle's circumference by the time required for one complete rotation: 2*pi*r/t. The formula V = w * r, where w (omega) is the angular velocity of the rotating object and r is the radius of the circle, also relates it to angular velocity.

m = 0.9 kg

r = 3m

v = 3m/s

Force (f) = mv2/r

Now ,putting values

force (f) = \(\frac{0.9 k g \times\left(3 \mathrm{~ms}^{-1}\right)^2}{3 \mathrm{~m}}\)

F = 2.7 N

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The work done by force on a spring hung from the ceiling will be 1.67 J

Any two things with mass are drawn together by the gravitational pull. We refer to the gravitational force as attractive because it consistently seeks to draw masses together rather than pushing them apart.

Given that a spring is hung from the ceiling with a 2.0-kg mass suspended hung from the spring extends it by 6.0 cm and a downward external force applied to the mass extends the spring an additional 10 cm.

We need to find the work done by the force

Given mass is of 2 kg

So let,

F = 2 kg

x = 0.1 m

Stiffness of spring = k = F/x

k = 20/0.006 = 333 n/m

Now the formula to find the work done by force will be as follow:

Workdone = W = 0.5kx²

W = 0.5 x 333 x 0.1²

W = 1.67 J

Hence the work done by force on a spring hung from the ceiling will be 1.67 J

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Answer:

a plumber

Explanation:

Germination is the process of a plant sprouting from a seed. Seed dispersal is the spreading of seeds away from the parent plant to establish new growth elsewhere.

We have to note that if the seeds of the plant are not dispersed that we can not be able to obtain the growth of the plant in new regions

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Missing parts;

Select the statement that best describes the importance of germination and seed dispersal in plant reproduction.

Plants can reproduce when seeds are germinated during seed dispersal.

Both germination and seed dispersal come before plant reproduction.

Germination has no involvement in plant reproduction, but seed dispersal does.

Plants can grow in new places when seeds are dispersed, and germination begins a new life cycle.

Answer:

yes

Explanation:

Answer:drfdcfrfvgtgy6hbhhbhyg vcfrfr5tgvcfrtg vcdftghegthetrgbdgtthethe3thet

Explanation:

Sdwerftyrujtnyhbvcrdefgswthyujdehrtgfyhrjfuygtdhjueyrtgehwu3y4tgrehjwheyrgdhbnsjhfgvbdnhgfdhjsdehbrvbdensdvfgreyhsdgrftyhedggrfdhsgfv

Answer:

The motion of the moon around the earth is circular motion

Explanation:

It will take the 6 cm bar 10.6 minutes to cool down to room temperature.

If it takes a 2 cm long insulated bar 7 minutes to cool down to room temperature, it will take a 6 cm bar made of the same material more than 7 minutes to cool down to room temperature.

                            First, we have to understand that the rate of cooling is inversely proportional to the length of the bar. This is because the it will take the 6 cm bar 10.6 minutes to cool down to room temperature. Surface area of the bar is directly proportional to its length.

Therefore, a longer bar will have more surface area and will lose heat faster than a shorter bar.

rate of cooling α 1/length of the bar Let's say the time it takes for the 6 cm bar to cool down to room temperature is T. 7/2 = T/6

T = 21/2

Therefore, it will take the 6 cm bar 10.6 minutes to cool down to room temperature.

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Answer:

mirror angle is related to sngle of incident n reflection becuse they are ewaul to each other

After the collision, the motorcycle's velocity is around 3.42 m/s, and the bicycle's velocity is approximately -1.42 m/s in the opposite direction.

To solve this problem, we can apply the principles of conservation of momentum and the coefficient of restitution. The conservation of momentum states that the total momentum before the collision is equal to the total momentum after the collision.

Let's denote the initial velocity of the motorcycle as v1, the initial velocity of the bicycle as v2, the final velocity of the motorcycle as v1f, and the final velocity of the bicycle as v2f.

The total momentum before the collision can be calculated as:

Initial momentum = (mass of the motorcycle * initial velocity of the motorcycle) + (mass of the bicycle * initial velocity of the bicycle)

= (75 kg * 10 m/s) + (45 kg * 8 m/s)

= 750 kg·m/s + 360 kg·m/s

= 1110 kg·m/s

According to the conservation of momentum, the total momentum after the collision is equal to the initial momentum:

Total momentum after the collision = (mass of the motorcycle * final velocity of the motorcycle) + (mass of the bicycle * final velocity of the bicycle)

= (75 kg * v1f) + (45 kg * v2f)

Now, let's consider the coefficient of restitution (e = 0.5). The equation for the coefficient of restitution is:

Coefficient of restitution (e) = (relative velocity of separation) / (relative velocity of approach)

= (v2f - v1f) / (v2 - v1)

Since it's a head-on collision, the relative velocity of approach is the sum of the velocities of the two masses before the collision:

Relative velocity of approach = v2 - v1

To find the relative velocity of separation, we can use the equation:

Relative velocity of separation = e * (relative velocity of approach)

= e * (v2 - v1)

Substituting these values into the equation for conservation of momentum, we have:

1110 kg·m/s = (75 kg * v1f) + (45 kg * v2f)

Since we have two unknowns (v1f and v2f), we need another equation to solve for them. Using the equation for the relative velocity of separation, we have:

v2f - v1f = e * (v2 - v1)

45 kg * v2f - 75 kg * v1f = 0.5 * (45 kg * 8 m/s - 75 kg * 10 m/s)

Now we have a system of two equations with two unknowns. Solving these equations simultaneously will give us the final velocities of the motorcycle (v1f) and the bicycle (v2f) after the collision.

By solving these equations, we find that the final velocity of the motorcycle (v1f) is approximately 3.42 m/s, and the final velocity of the bicycle (v2f) is approximately -1.42 m/s. The negative sign indicates that the bicycle is moving in the opposite direction after the collision.

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Answer:

0.00025 kilometers

Explanation:

divide the length value by 1e+6

Answer:

250 mm = 0.00025 km.

Explanation:

250 mm equal 0.00025 km

Conversion details

To convert mm to km use the following formula:

1 mm equals 0.000001 km

So, to convert 250 mm to km, multiply 0.000001 by 250 i.e.,

250 mm = 0.000001 * 250 km = 0.00025 km

(hope this helps can i plz have brainlist :D hehe)

The magnetic field at the surface of the superconductor is 0.628 x 10^-3 T, which is approximately equal to 0.629 mT.

The magnetic field at the surface of the superconductor can be calculated using the formula:

B = μ₀I/2R

where B is the magnetic field, μ₀ is the permeability of free space (4π x 10^-7 Tm/A), I is the current, and R is the radius of the superconductor.

Substituting the given values, we get:

B = (4π x 10^-7 Tm/A) x (2517.2 A) / (2 x 0.001 m)

Simplifying this expression, we get:

B = 0.628 x 10^-3 T

Therefore, the magnetic field at the surface of the superconductor is 0.628 x 10^-3 T, which is approximately equal to 0.629 mT.

The closest answer from the given options is 0.504787 T, which is not the correct answer. Therefore, the correct answer is not among the given options.

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When you push a pencil off your desk, the energy transformation that takes place is that potential energy transforms into kinetic energy.

The correct answer to the given question is option C.

Potential energy is the energy stored within an object because of its position or configuration.

In this scenario, the pencil has potential energy because of its elevated position on the desk. When the pencil is pushed off the desk, it begins to move, which means that it has kinetic energy. Kinetic energy is the energy of motion.

As the pencil falls off the desk, its potential energy is transformed into kinetic energy, which is the energy that results from its motion. The faster the pencil falls, the greater its kinetic energy will be because kinetic energy is directly proportional to the square of an object's velocity.

Therefore, when you push a pencil off your desk, the potential energy that it has because of its elevated position is transformed into kinetic energy as it falls towards the ground.

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Answer:

A force 1500 n to a 100 kg car . what is the acceleration of the car

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Explanation:

The rate at which the x-ray tube consumes energy is 5,600 watts.

The power consumption of an x-ray tube can be calculated using the formula:

P = IV

where P is the power in watts, I is the current in amperes, and V is the voltage in volts. Given that the current I is 7 mA (or 0.007 A) and the voltage V is 80 kV (or 80,000 V), we can substitute these values into the formula:

\(P = 0.007 \times 80,000 \\P = 560 \text{ watts}\)

However, this calculation gives the power consumed over one second. Since the exposure time is 10 seconds, we need to multiply this value by the exposure time:

\(\text{Total Power} = 560 \times 10 \\ \text{Total Power} = 5,600 \text{ watts}\)

Therefore, for a 10-second exposure, the rate at which the x-ray tube consumes energy is 5,600 watts.

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The cannonball will be in the air a time of: 3.6421 s

The horizontal launch formula we will use and the procedure is:

t = √((2 * h) / g)

Where:

Information about the problem:

Applying the time formula we have:

t = √((2 * h) / g)

t = √((2 * 65 m) / 9.8 m/s²)

t = √(130 m / 9.8 m/s²)

t = √(13.2653 s²)

t = 3.6421 s

Is the motion described by an object that has been thrown horizontally with no angle of inclination at a certain height and considers the effect that the force of the earth's gravity has on the thrown object.

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