Which of the following is a contact force? a. magnetic
b. applied
c. gravity
d. electric​

Answer.

Conduction

Convection

explanation.

Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.

Answer:

fossil c

Explanation:

Answer:

The greatest force of gravity on the ball will occur at the point when the ball is near to hit the ground

Explanation:

We know that the earth's center attracts everything towards its center with an acceleration of 9.8 m/s² so it simply means that the change in velocity must occur to produce acceleration. When the ball comes towards the earth, its speed  continuously increases and it is at maximum level when it is about to hit the ground so this is the point where gravitational force is maximum.

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Answer: D

Explanation:

Frank’s Furniture trains all of its employees to use computers is an example of an improvement in human capital.

Answer:

2.5m/s²

Explanation:

Given parameters:

Mass of car  = 200kg

Force on car  = 500N

Unknown:

Acceleration of the car  = ?

Solution:

According to Newton's second law of motion:

      Force  = mass x acceleration

Insert the given parameters and find the acceleration;

         500  = 200 x acceleration

           acceleration = 2.5m/s²

Explanation:

F = ma

500N = 200 × a

200a. = 500N

a. =. 2.5m/s²

PLEASE GIVE BRAINLIEST.

Given that,

Initial position of the spring, x₁ = 0.25 m

Final position of the spring, x₂ = 0.1 m

The spring constant of the spring, k = 100 N/m

To find,

The elastic potential energy stored from the spring's compression.

Solution,

The work done in moving a spring from on position to another is stored in the form of elastic potential energy. It can be given as follows :

[tex]E=\dfrac{1}{2}k(x_2^2-x_1^2)\\\\=\dfrac{1}{2}\times 100\times (0.1^2-0.25^2)\\\\=2.62\ J[/tex]

So, the required energy is 2.62 J.

Answer:

1.125 J

Explanation:

The correct answer is 1.125 J

The frequency of electromagnetic waves is 5.64 x 10¹⁴ Hz.

We need to know about electromagnetic waves to solve this problem. Electromagnetic waves can propagate without media. The speed of electromagnetic in vacuum media is equal to the speed of light. Hence, the wavelength and frequency can be determined as

c = λ . f

where c is the speed of light (3 x 10⁸ m/s), λ is wavelength and f is frequency.

From the question above, we know that

λ = 532 x 10¯⁹ m

By substituting the given parameter, we can calculate the frequency of green laser pointer

c = λ . f

f = c / λ

f = 3 x 10⁸ / 532x10¯⁹

f = 5.64 x 10¹⁴ Hz

Hence, the frequency is 5.64 x 10¹⁴ Hz.

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Answer:

13.33 m/s^2

Explanation:

Velocity^2 then divide that by the radius

Answer:

The ball will have a displacement of 0.5*15.0=7.5m after 0.5 seconds. The velocity of the ball will be 15.0 m/s, since it is not acted on by any forces except gravity (which acts in the direction opposite of the velocity).

Explanation:

We know this is the answer because, according to the kinematic equation:

v^2=u^2+2*a*d

0=15.0^2+2*(-9.8)*d

d=-7.5m

The calculated time taken is 10.7 hours

Given that our speed is 1 km/h and our width is 0.5 m, we can mow a path that is 0.5 m wide and 1000 m long in an hour, covering a total area of 1000 m * 0.5 m = 500 m2/hr.

Let's now determine the size of that football field.

5350.692864 m2 is equal to 360 ft / 3.281 ft/m plus 160 ft / 3.281 ft/m.

To determine how many hours it will take, divide that area by the 500 m2 that was previously determined.

500 m2/hour / 5350.692864 m2

= 10.70138573 hr

In other words, moving the football field would take around 10.7 hours.

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Answer:

D. 4Al + 3O2 → 2Al2O3

Explanation:

Chemical reactions involves the chemical combination of two or more substances called REACTANTS to yield other substances called PRODUCTS. However, in accordance with the LAW OF CONSERVATION OF MASS, the amount of reactants must be equal to that of the products.

To accomplish this, the reaction must be BALANCED. A balanced equation is an equation in which the number of atoms of each element in the reactant side equals the number of atoms in the product side. In this reaction involving Aluminum and Oxygen to give Aluminum oxide as follows:

Al + 02 → Al2O3

A coefficient is used to balance the number of atoms on both sides of the equation as follows:

4Al + 3O2 → 2Al2O3

Answer:

here for points

3u3784y297y4ui3t7

Explanation:

Explanation:

The formula to determine the eccentricity of an ellipse is the distance between foci divided by the length of the major axis

The density of aluminum in units of kilogram per cubic meter is 2700kg/m³

The density of aluminum in units of pounds per cubic foot is 1.686lb/ft³

unit conversion - conversion of one unit to another unit of measurement of same quantity by using multiplication/division.

the density of aluminum is 2.70 g/cm3.(given)

1 kg = 1000g

1m = 100cm

density of aluminum in kg/m³ is :

2.7×10⁻³kg/10⁻⁶m³

2700kg/m³

density of aluminum in  lb/ft³ (ponds per cubic foot) is :

1g = 0.2204lb

1cm = 0.328ft

= 2.7×0.02204/(0.328)³

1.686lb/ft³

The density of aluminum in units of kilogram per cubic meter is 2700kg/m³

The density of aluminum in units of pounds per cubic foot is 1.686lb/ft³

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Answer:

Sound waves move by vibrating objects and these objects vibrate other surrounding objects, carrying the sound along. The further away from the original source of a sound you are, the waves lessen until they don't have the strength to vibrate any other particles.

Explanation:

Answer:

A.

Explanation:

The X-Axis is always on the left side.

Answer:

v = u +at

Explanation:

The equation that relates the final velocity and the average acceleration is written as follows :

v = u +at

Where

v is final velocity

u is initial velocity

a is acceleration

t is time

This equation is valid when the motion is with constant acceleration.

The wavelength of a sound wave with a velocity of 350 meters/second and a frequency of 430 Hz is 0.81 meters.

The relation between velocity(v), frequency(f) and wavelength(lambda) of a sound wave is given by the following formula,

V = (f)(λ)                                                 equation1

We are given that , v = 350 meters/second

f = 430 hertz

By putting the above values in the equation1 , we will get

350 = 430 x (λ)

350/430 = λ

λ = 0.81 meters

Thus, the wavelength of a sound wave with a velocity of 350 meters/second and a frequency of 430 Hz is 0.81 meters.

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Answer:

1: The Ball Has 80,000 J

2: Their Potential Energy Is 934,083 J At That Point

3: They Would Have 203,200 Kinetic Energy

4: The Person Would Have More Potential Energy GoingUp A 1500 M Hill Rather Than Walking 1500 M On A Flat Surface Because When You Walk Up Something You Have More Potential Energy Then When You Walk On Flat Ground

Reason:

1: 100kg x 40 m/s = 80,000

2: 63.5 x 1500 M = 934,083

3: 63.5 x 80 M/s = 203,200

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia

Answer:

B. Friction with air also affects the fall of the object.

Explanation:

The limitation of this experimental design is that friction with air also affects the fall of the object.

Therefore, the experiment will be biased due to the influence of the frictional force.

Answer:

Kinetic

Explanation:

Its a moving action

When a bicyclist is pedaling up a hill, it is a form of potential energy. The correct option is option potential energy.

An object's position or configuration in relation to other things might provide it potential energy. The potential energy in this situation is gravitational potential energy.

Because they are being lifted against gravity as they ascend the hill, the cyclist gains gravitational potential energy. The potential energy of the cyclist increases as they ascend.

The potential energy will be transformed into kinetic energy once the cyclist begins pedaling or moving downward.

As a result of their increased height above the ground, cyclists are building up potential energy as they bike up a hill. They gain speed as they cycle downhill, transforming that potential energy into kinetic energy.

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Answer:

8.6m/s²

Explanation:

Given parameters:

Initial velocity  = 0m/s

Time  = 5.5s

Distance  = 130m

Unknown:

Acceleration  = ?

Solution:

To solve this problem, we use one of the appropriate motion equations:

       S  = Ut  + [tex]\frac{1}{2}[/tex] at²

S is the distance

U is the initial velocity

t is the time taken

a  is the unknown acceleration

t is time taken

    Since U = 0m/s

      S  =  [tex]\frac{1}{2}[/tex] at²

     130 =  [tex]\frac{1}{2}[/tex]  x a x 5.5²  

     130  = 15.13a

         a  = 8.6m/s²

According to the graphic, the weighing balance has a hundredth-place level of uncertainty.

The characteristic of matter that gauges its resistance to acceleration in physics. An object's mass can be thought of as a rough count of its atoms.

Any tool that measures an object's mass or weight is referred to as a balance. Every laboratory needs balance as an essential tool.

In the hundredth position, there is uncertainty. There are always three significant figures for a mass that is between 1 gram and 9 grams when it is measured on this balance.

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The magnitude of the magnetic field on the axis of the ring (1/2)R from its center is [tex]\frac{\mu_{0} \omega qR^{2}}{2.5(\sqrt{5} )\pi R }[/tex].

The magnetic influence on moving electric currents, electric charges, and magnetic materials is described by a magnetic field, which is a vector field. A force acting on a charge while it travels through a magnetic field is perpendicular to both the charge's motion and the magnetic field.

The radius of the nonconducting ring is R.

The ring is uniformly charged q.

The ring rotates at a speed of ω.

The distance between the ring and its center is x = (1/2)R.

The magnetic field on a current loop's axis is given as follows:

[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi (x^{2}+R^{2})^{\frac{3}{2}} }[/tex]

Now, [tex]I=\frac{q}{2 \pi /\omega}[/tex]

The magnetic field's strength at x = R/2 is:

[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi (x^{2}+R^{2})^{\frac{3}{2}} }[/tex]

[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi ((\frac{R}{2} )^{2}+R^{2})^{\frac{3}{2}} }[/tex]

[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi ((\frac{5}{4} )R^{2})^{\frac{3}{2}} }[/tex]

[tex]B = \frac{\mu_{0} \omega qR^{2}}{2.5(\sqrt{5} )\pi R}[/tex]

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The broglie wavelength is 9.27 x 10¯³⁵ meter.

We need to know about de Broglie's wavelength to solve this problem. Broglie's wave equation is the following :

λ = h / (m.v)

where λ is the wavelength, h is Max Planck constant 6.62x10⁻³⁴ J.s, m is the mass and v is velocity.

From the question above, we know that:

m = 231 gram = 0.231 kg

v = 34 m/s

By substituting the parameter, we get :

λ = h / (m.v)

λ = 6.62x10⁻³⁴ / (0.21 x 34)

λ = 9.27 x 10¯³⁵ m

Hence, the broglie wavelength is 9.27 x 10¯³⁵ meter.

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