Jack pulls a car up a hill. Jack does 405J of work on the car. If Jack walks 15m up the hill,
how large of a force must he exert.

Answer:

Joule (J)

Explanation:

Joule (J) is the SI unit of heat energy (any energy - thermal, electrical, mechanical..).  It is named after the English physicist James Prescott Joule.

Answer:

29.55 kg

Explanation:

force gravity =  G m1 m2 / (r^2)    now change the mass 1 and the r

                     =   G 2m1 m2 / ( 2r)^2

                      = 2/4  G m1 m2 / (r^2)

the weight will be 2/4   or  1/2 the original

Answer:

The angular speed of the system increases because the moment of inertia of the system has decreased.  

Explanation:

Answer:

The total energy of the system remains constant due to the law of conservation of energy.

The diagram is the one that starts with "wind energy" and breaks up into "heat energy in the turbines and air" and "kinetic energy in moving the turbine"

Explanation:

I just took the test and this was the correct answer.

You almost certainly meant to say the particle's position is a function of time t, not some other variable x (or vice versa) so that

s(t) = 5t sin(2t)

Differentiate s(t) to get the instantaneous velocity of the particle at time t. By the product rule,

s'(t) = 5 sin(2t) + 10t cos(2t)

Evaluate the derivative at t = 0 :

s'(0) = 0

The instantaneous velocity at t = 0 is 0 m/s.

To find the instantaneous velocity at t = 0, we need to take the derivative of the position function s(t) with respect to time (t). The derivative of s(t) gives us the velocity function v(t), which represents the particle's velocity at any given time t.

Given the position function s(t) = 5t * sin(2t), we find the velocity function v(t) by taking the derivative:

v(t) = d/dt (5t * sin(2t)).

To find the velocity at t = 0, we substitute t = 0 into the velocity function:

v(0) = 5 * 0 * sin(2 * 0) = 0.

Therefore, the instantaneous velocity of the particle at t = 0 is 0 m/s. This means that at t = 0, the particle is momentarily at rest, and its velocity is neither increasing nor decreasing at that specific moment.

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Answer:

Time,

t

=

3.1

s

Temperature,

T

=

23.0

∘

Speed of the sound at

23.0

∘

can be given as,

{eq...

Answer:

350 j

Explanation:

K.E. = 1/2 m v^2

      = 1/2  7 * 10 ^2 = 350 j

White color is the result of adding various combinations of red, green, and blue primary light colors in equal intensities.

The three primary colors are Red, green, and blue. This implies that by additively combining the colors red, green, and blue in varied proportions the different color is obtained.

Practically all other colors may be made, and when the three primaries are mixed together in equal amounts, white is produced.

Hence white color is the result of adding various combinations of red, green, and blue primary light colors in equal intensities.

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Answer:

13 and 9

Explanation:

Coefficients are numbers that are being multiplied by a variable. In this case, 13 and 9 are being multiplied by x and y, so they are the coefficients. 77 and 11 are constants.

The Sun is a main-sequence star which is also known as G2V.

It can also known as yellow dwarf because of its yellow colour. It was formed about 4.6 billion years ago from the gravitational collapse of matter of a large molecular cloud.

So we can conclude that the Sun is a main-sequence star which is also known as G2V.

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Earth has a definite orbit within the solar system whose the orbit is mainly a result of the mass of the Sun.

An orbit is defined as the regular, repeating path that one object in space takes around another while an object in an orbit is called a satellite which may be natural, such as the Earth or the Moon. According to the height of satellites from the earth, these orbit are classified as

Most of the weather and some communications satellites will tend to have a high Earth orbit which is farthest away from the surface. The main difference between orbit and orbitals is that the former is defined as a fixed path of electron revolutions, whereas the latter is defined as an uncertain region with a high probability of finding an electron.

Therefore, the Earth has a definite orbit within the solar system whose the orbit is mainly a result of the mass of the Sun.

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Answer:

moon planet star galaxy universe

Explanation:

Sound travels faster In solids than liquid than gases

Speed of sound is highest in solids, and higher in liquids and slower in gases. Example- Sound travels in air with the speed of 330 m/s, In steel it travels with a speed of 5920 m/s, In liquids it travels with a speed of 5000 m/s.

Hope this helps you

If a supernova remnant core has a mass greater than 2.8 solar masses, then NO force will be able to stop gravity from collapsing the core. (Option C)

A supernova Remnant Core is an astronomic structure that is remaining after the explosion of a star in a supernova has occurred.

A supernova is simply the explosion of a star. When the mass of the sun is used as a unit of mass, it is called solar mass. This unit is given as:

1.989 × 1030 kg.

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Answer:

A wave carries energy

Explanation:

The best responses to the statements are:

a. the current decreased.

b. The Same.

c. 2.5.

d. 0.25.

In an electrical circuit, resistance is a measure of the resistance to current flow.

The Greek letter omega is used to represent resistance in ohms.

The resistance is inversely proportional to the current.

Thus, the correct options are a. the current decreased.

b. The Same.

c. 2.5.

d. 0.25.

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Answer:

Ye ye answer be below:

Explanation:

~Hope this helps! :)

Answer:

[tex] \huge\boxed {\sf Velocity}[/tex]

Explanation:

The unit of measurement is m/s hence it can not inertia or force because the unit of intertia and force are kg m² & kg⋅m/s² respectively, hence Option C and Option D can not be the right answer.

To understand the final answer one must know the difference between velocity and speed.

Velocity is a vector quantity which is direction specific. It's the displacement per unit time, the displacement is an vector quantity.

[tex] \sf \: Velocity = \frac{Displacement }{Time} [/tex]

Velocity can be positive negative or zero!

Speed is a scalar quantity which tells the distance covered in unit time. since it's a scalar it have magnitude only, not direction.

[tex] \sf \: Speed = \frac{Distance }{Time} [/tex]

Speed is always either zero or positive.

In the question it tells the baseball is flying through the air at 40 m/s east,

if it was only 40m/s with no direction then it would be speed. but the east is indicating the direction and velocity includes the direction hence the given measurement represents Velocity.

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Answer:

A wire carrying a 30.0-A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.16-N force on the 4.00 cm of wire in the field. What is the average field strength?

Explanation:

hope this helps trying to be brainliest

Answer:

iron

Explanation:

The similarities between the two models of the solar system are :

The solar system can be represented using two different models ( the Earth centered model and the sun centered model ) in both model the sun or the earth is kept as a central planet while other planets including the moon and stars revolve round the central planet.

Hence we can conclude that the similaritied between the models are as listed above.

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The function of the load in an electric circuit is it safely opens and closes the circuit. Thus, the correct option is D.

An electrical load is an electrical component or a portion of the electric circuit which consumes electric power, such as electrical appliances and lights inside the house. The electric loads may also refer to the power consumed by a circuit. This is opposite to a power source, such as a battery or a generator, which produces electric power.

The base load power plants typically are the coal-fueled or nuclear plants due to their low-cost fuel and steady state power they can produce in a plant. The hydropower and geothermal power plants can also be used for the purpose of base load electricity generation if those resources are regionally available.

Therefore, the correct option is D.

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Answer:

all subjective study or experiment if the correct answer of given statement

Answer:

science is a practical yet knowledge based subject based of the way of subtle nature and way everything works . neither theory nor law . science is a thing that constitutes both in a way further understandable and easy . hope it solved you query

The fact that large elliptical galaxies are more common in central galaxy clusters suggests that collisions play a role in the formation of these galaxies.

Galaxy formation is a physical phenomenon where molecular clouds of dust concentrate and thus first generate stars.

Galaxy formation is a process that can be associated with collisions, at least for the formation of elliptical galaxies.

Collisions are a relatively frequent process in clusters (groups) of galaxies that are formed by crashes with other galaxies.

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Answer:

The Balmer series is given by

1 / λ = R (1 / 2^2 - 1 / n^2)

where R is the Rydberg constant of 1.0968E-3 / Angstroms

(1 Angstrom = 1.0E-1 nm = 10E-10m)

Let x = (1 / 4 - 1 / n^2)

x = 1 / (R λ)

Note 410 nm = 4100 A

x = 1 / (1.0968E-3 * 4.1E3) = 1 / (1.0968 * 4.1) = .222

If we write

x = 1/4 - 1/n^2 = .222

1/n^2 = 1/4 - .222 = .0276

n^2 = 36.2

So n = 6

(Since modern terminology gives wavelengths in nanometers - it might be helpful to write R = 1.0968E7 m-1)

A star will become a white dwarf when its nuclear fuel is finished because of no more emission of heat and light.

When the end of the nuclear burning stage of a star comes, such a star expels most of its outer material creating a planetary nebula until only the hot core remains. When this core settles down, it will become a young white dwarf.

So we can conclude that a star will become a white dwarf when its nuclear fuel is finished because of no more emission of heat and light.

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Answer:

The gasoline engine would have:

intake stroke

compression stroke

power stroke

exhaust stroke        

This is a total of 2 revolutions and 4 thermodynamic cycles

So the number of thermodynamic cycles is twice the rpm of the engine

3.75 N of force will be applied to a charge. Because of the electric field, a force operated on the charge.

The electric force between two charges is proportional to their product and inversely proportional to the square of their distance.

In this question, the provided data is:

F is the applied force,

q denotes the charge, which is equal to 2.5 C.

v is the velocity = 5.0 10³ m/s

B is the magnetic field = 3.0 10² T

The following is the force on a moving charge:

[tex]\rm F = q V B sin \alpha \\\\ F = 2.5 \times 10^{-6} \times 3 \times 10^{-2} \times 5 \times 10^3 \\\\ F=3.75 \ N[/tex]

As a result, 3.75 N will be exerted on a charge.

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Answer:

3.8 N

Explanation:

got it right on edge

The forces exerted on a charge will be 3.75 N.The force acted on the charge due to the electric field.

The electric force between the two charges is directly propotional to the product of the charge and inversly propotional to the square of the distance between them.

The given data in the problem is;

F is the force exerted

q is the charge = 2.5 µc

[tex]\rm \alpha[/tex] is the angle = 90°

B is the magnetic field = 3.0 × 10² T

v is the velocity = 5.0 × 103 m/s

Force on the moving charge is found as;

[tex]\rm F = q V B sin \alpha \\\\ F = 2.5 \times 10^{-6} \times 3 \times 10^{-2} \times 5 \times 10^3 \\\\ F=3.75 \ N[/tex]

Hence the force exerted on a charge will be 3.75 N

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Answer:

Most alpha particles went right through. This showed that the gold atoms were mostly empty space