correct answer id C but how.. explain

An experiment to investigate the relationship between the applied force and the displacement of the spring, requires a spiral spring, two different masses and a meter ruler to measure the original length and displacement of the spring.

This experiment seeks to demonstrate Hooke's law, which states that  the applied force F is equal to a constant k, to a displacement or change in length x. Mathematically, F = kx.

To demonstrate this law, we need;

The set up appears as shown in the image attached. The natural length of the spring is first measured and recorded. The masses are now added gradually and the displacement of the spring is recorded each time.

A straight line graph is obtained when the force is plotted against the displacement within the elastic limit of the spring.

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The three statements which provide evidence of universe expansion that supports the Big Bang Theory include the following:

The Big Bang Theory simply refers to an explanation that was given by astronomers to describe how the universe was formed, which describes a well-detailed information on how the universe started (its origin).

According to the Big Bang Theory, the whole universe stretched from a single point and then expanded to its present state and this is typically supported by the following evidence:

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Complete Question:

Which provides evidence of universe expansion that supports the Big Bang Theory? Select the three correct answers. (2 points)

An enormous amount of weak background radiation has been detected in the universe.

The temperature of the universe is decreasing.

The temperature of Cosmic Microwave Background radiation varies widely from one part of the universe to another

Galaxies are moving away from each other.

The universe is undergoing a cycle of contraction and expansion

The temperature of the universe is increasing.

From the conservation of linear momentum, the common speed in which the two will move together immediately after colliding is 1.33 m/s

Conservation of Linear Momentum state that the sum of the momentum before collision is the same as the sum of the momentum after collision.

Given that a 2 kg blob of putty moving at 4 m/s slams into a 6 kg blob of putty at rest.

The common speed V of the two stuck together blobs immediately after colliding can be calculated by using the formula

M1U1 + M2U2 = (M1 + M2)V

(2 × 4) + 0 = (2 + 4) V

8 = 6V

V = 8/6

V = 1.33 m/s

Therefore, the common speed of the two stuck together blobs immediately after colliding is 1.33 m/s

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The other pancakes are at various temperatures and Conduction refers to the mode of transfer of thermal energy that arise when the two bodies are in close contact.

The other pancakes are presumably at different temperatures in this scenario. If this is the case, then due to the thermal energy transfer, the pancake with the highest temperature should be the warmest at the bottom. Conduction is the process through which thermal energy is transferred when two bodies are in close proximity to one another.

Thermometers are used to measure the air's temperature. Common thermometers have a glass rod inside of which is a very thin tube. A liquid is delivered to the tube from a reservoir, or "bulb," at the thermometer's base. Sometimes the liquid is reddish alcohol, and other times it is mercury.

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The induced emf in a single loop of wire -1.48 V.

Induced EMF is the exchange in capability difference due to a change within the magnetic flux of a coil, while modern-day is the drift of electrons thru a conductor in a closed circuit.

ε = | N ΔФ/ Δt | = N |Ф₂ - Ф₁ / Δt |

ε = induced emf

N = number of loop, given, 1

Ф₂ = final magnetic flux, given, 0.110 Tm²

Ф₁ = initial magnetic flux , given, 0.850 Tm²

Δt = change in time , given, 0.5s

Put these values in formula, ε = | N ΔФ/ Δt | = N |Ф₂ - Ф₁ / Δt |

ε = - 0.740/0.5

ε = -1.48 V

Hence, the induced emf in a single loop of wire -1.48 V.

An emf is induced inside the coil whilst a bar magnet is pushed inside and out of it. Emfs of opposite symptoms are produced through movement in opposite instructions, and the emfs are also reversed by using reversing poles. The same outcomes are produced if the coil is moved instead of the magnet it's miles the relative movement this is crucial.

An emf is produced whenever the magnetic flux is modified in a closed circuit. This emf is referred to as the brought about emf, and the cutting-edge that flows inside the closed circuit is called the induced current.

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The item can not be made of silver because its density is less than that of pure silver.

One of the most important properties of a substance is the density of the substance. The term density is defined as the ratio of the mass to the volume of the object. Note that density of an object is one of the intrinsic properties of the substance hence it could be used in the identification of the substance. This is hw we shall now identify the substance

As such, we here have an object that we have been told is made of silver. We must now compute the density of the object from the given data and compare with the density of silver available from literature.

The density of the object is; 12.2 grams/1.9 cm 3 = 6.42 g/cm^3. The density of silver is 10.49 g/cm³ hence the object is not silver.

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Elements have atoms and protons which makes them the building blocks of matters.

What are elements?

The nature of elements make them impossible to broken down into simpler kinds of matter.

Elements can be grouped into:

In summary, elements have atomic number, structures, densities, and unique properties.

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The mass of the rock is, m = 24 kg

The velocity of the rock is, v = 2 m/s

The kinetic energy of the rock can be given by the formula

Substituting the values, the kinetic energy will be

The useful energy of 17KJ is left for moving the car.

The input energy=85KJ

The wasted energy=68KJ

The work energy=?

We know,

input energy= wasted energy + work energy

85=68+work energy

85-68=work energy

17=work energy

∴ work energy = 17KJ

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The action force is the rocket pushing out the gases that are produced by the engine of the rocket.

The reaction force is the gas pushing the rocket back on the rocket to make it go upward and outward into space.

A rocket does not need air to push on because gases produced by the engine of the rocket enable the action and reaction force that is required by the rocket to go into space. Thus in the presence of these gases, a rocket does not need air to push on.

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The statement that is most likely true about these area A is it has more food resources than area B.

In the given graph, it is clear that carrying capacity of area A is larger than that of area B. Larger the carrying capacity, larger will be its quantity of food resources.

Carrying capacity is the maximum population size that a habitat can support as per its available resources such as food, space etc. It can also be called as a species' average population size in a particular habitat.

The given question is incomplete. The complete question is in the link mentioned below.

Therefore, the statement that is most likely true about these area A is it has more food resources than area B.

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The first stage in the evolution of stars is the protostellar phase. It lasts roughly 500,000 years for a low-mass star (sun-mass or less).

When a star is still gaining mass from its parent molecular cloud, it is referred to as a protostar. The first stage in the evolution of stars is the protostellar phase. It lasts roughly 500,000 years for a low-mass star (sun-mass or less). A molecular cloud fragment first experiences self-gravity-induced collapse before entering the phase, where an opaque, pressure-supported core develops inside the fragment. It comes to an end when the gas that is descending outruns it, leaving a pre-main-sequence star that subsequently contracts to become a main-sequence star at the start of hydrogen fusion that produces helium. Since the protostar is still contracting, its diameter and surface area are extremely large, and its luminosity may be approximately 100 times greater than when it is fully formed.

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Answer:

......................

Answer:

Explanation:

The independent variable of an experiment is the part that the experimenter is changing and can control. The dependent variable is the part of the experiment that is affected by the change.

For example, with a plant, if you water a plant, that is an independent experiment, dependent on you actually watering the plant. The dependent variable is the plant's condition. It is dependent on being watered.

Answer:

26 mi/hr

Explanation:

65 miles  /  2.5 hours = 26 mi/hr

A force is an influence that has the power to alter an object's motion. A massed object's velocity can be changed or accelerated by a force. A force is a vector quantity since it has both magnitude and direction.

The mass of a physical body is a measure of its entire makeup. It also measures inertia, or the body's resistance to acceleration when a net force is applied. The strength of a body's gravitational pull on other bodies is also influenced by its mass. Kg is used as the fundamental mass unit.

Acceleration is the rate at which the velocity of an object modifies with respect to time. The direction of the net force acting on an object determines its acceleration.

As we know,

Force = mass x acceleration

Therefore, acceleration = force / mass

                                       = {(35 / 30) - (35 / 20)} kgN

                                       = 0.583 kgN towards right

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The maximum resultant of two vectors , one 10m/s and 20 m/s will be 22.36.

The movement of an object that has been launched into the air is known as projectile motion. Only gravity is felt by the item after the initial force that launches it. Projectile and trajectory both refer to the same thing: an object. Air resistance is the name for the frictional force that an object experiences as it moves through the air and slows it down. Air resistance does greatly change trajectory motion, but because it is difficult to calculate, it is not taken into account in basic physics.

The separation of horizontal and vertical motions is the most crucial idea in projectile motion.

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An ohmic conductor's resistance is independent of the applied voltage, so the temperature stays constant.

An ohmic material or component is any material, component, or device that complies with Ohm's law, according to which the current flowing through the object is proportional to the applied voltage. Nonohmic materials and components are any substances or parts that do not adhere to Ohm's law.

Ohm's law, which describes how current, voltage, and resistance are related. The voltage or potential difference across a large number of materials directly correlates to the amount of steady current through those materials.

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A thermal energy of 32J is equivalent to the work done by a 2-N force acting over a distance of 16 m (option A).

Work done is measure of energy expended in moving an object. It can be said that no work is done if the object does not move.

Work done can be calculated by multiplying the force by distance as follows:

Work done = force × distance

According to this question, the thermal energy transferred during a calorimetry experiment is equal to 32 J.

Since work done is force multiplied by distance, this suggests that a force of 2N will be acting over a distance of 16metres.

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Answer:

Option - d This is trick question, since the solar constant never change. The gravity of the Sun keeps the planets in their orbits at all times. They stay in their orbits, since there is no other force in the Solar System which can stop them. Yeah this might help. Add to brainliest please

The magnitude of the acceleration when the crate's mass is 310 kg is 0.74 m/s² and the acceleration when the crate's weight is 310 N is 7.3 m/s².

What is acceleration?

The rate at which an item changes its velocity both in magnitude and direction is known as acceleration, a vector quantity. If an object's velocity is changing, it is accelerating.

Although the full specification of force,

[tex]F_{nett} = ma[/tex] where, m = mass, a = acceleration

This situation involves both x and y axes, only the x-application is needed to find what this particular problem asks for.

We note that acceleration in y axis is 0 so, we can denote acceleration in x axis simply as a. We choose +x to the right and +y up.  

Let's calculate the x component of the force working on the crate:

[tex]F_x = F cos38^0[/tex]

putting values from question, we get

Fx = 355 N

and the resistive force have magnitude (f) = 125 N

(a) As per the Newton's second law

Fx - f = ma

355 - 125 = 310 a

(acceleration) a = 0.74 m/s²

(b) In this case, By the equation:

mass = weight/gravitational acceleration

we get mass(m') = 310/9.8 = 31.6 kg

Now, by Newton's second law

Fx - f = m' a

355 - 125 = 31.6 a

(acceleration) a = 7.3 m/s²

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Complete question

A worker drags a crate across a factory floor by pulling on a rope tied to the crate. The worker exerts a force of magnitude 450 N on the rope, which is inclined at an upward angle 38° to the horizontal, and the floor exerts a horizontal force of magnitude 125 N that opposes the motion. Calculate the magnitude of the acceleration of the crate if (a) its mass is 310 kg and (b) its weight is 310 N.

Answer: Pitch of the sound depends on the frequency of the sound wave. The pitch is affected by the source of production of sound wave. It also depends on the shape of the medium in which it travels.

Explanation:

Answer:

water

Explanation:

The driver's reaction time during uniform motion is 1 second or 3 second.

We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule

vt = vo + a . t

vt² = vo² + 2a . s

s = vo . t + 1/2 . a . t²

where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.

From the question above, we know that

vo = 72 km/h = 20 m/s

vt = 0 m/s

a = -10 m/s²

sactual = 35 m

Find the instant distance without reacting

vt² = vo² + 2a . s

0² = 20² - 20s

s = 20 m

Find the reaction distance

sreact = sactual - s

sreact = 35 - 20

sreact = 15 m

Find the time reaction

sreact = vo . t + 1/2 . a . t²

15 = 20t - 5t²

t² - 4t +3 = 0

(t - 3)(t - 1) = 0

t = 3 s or t = 1 s

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The amount of time needed for a radioactively decaying substance to drop to half its initial amount is known as the half-life. 75% of the sample of thorium-227 decays in 38 days.

The half-life, in radioactivity, is the amount of time needed for half of the atomic nuclei in a radioactive sample to spontaneously transform into other nuclear species while emitting particles and energy, or, alternatively, the amount of time needed for the radioactive sample to disintegrate on average once every second.

Calculate the  number of half lives that must elapse to obtain amount needed. Let x the  no. of half life that elapse

Amount of thorium-227 remaining =

Original amount of thorium 227*1/2 for each half-life

1/4 = 1*1/2x

x = 2

The no. of days are required by  multiplying the half-life with the number of half-lives elapsed:

19/1 half-life*number of half-life = total days

19/1*2 = 38 days

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In the situation shown, if the cannon fires a banana aimed underneath the monkey at the same time that the monkey falls from the tree, the banana will fly below the monkey and miss.

In the presence of gravity, the banana will move in a parabolic path. As the monkey lets go of the tree, it will have a downwards acceleration due to the presence of gravity. But both the banana and the monkey will have the same amount of acceleration. Because gravity causes objects to accelerate at the same rate independent of their mass.

Since both the banana and the monkey experienced the same acceleration, both will fall equal amounts of distance below their gravity-free path. So the banana misses the monkey, moving below the monkey. The only way the banana hits the monkey is that if the cannon is aimed at the monkey.

Therefore, if the cannon fires a banana aimed underneath the monkey at the same time that the monkey falls from the tree, the banana will fly below the monkey and miss.

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All the statements given about simple machine and mechanical advantage are right.

A simple machine is any device that makes work faster and easier. A simple machine can also be defined as any device that allows effort to be applied at one end to overcome load at another end.

Thus, simple machines put out more work than people put in. (true)

Simple machines are designed to reduce applied force on an object by multiplying the input force.

Mechanical advantage is a factor of the simple machine that multiplies force.

M.A = output force / input force

When a machine with a mechanical advantage greater than 1 it multiplies force.

Also, when a machine with a mechanical advantage less than 1 it multiplies distance.

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Answer:

sleep well

bukas nalng yan kakapagod ehh

In order to find the time it takes, first let's convert the distance from miles per hour to feet per second: calculate the acceleration using Torricelli's equation

Then, let's :

Now, we calculate the time with the formula below:

Therefore the time required is 1.7 seconds.