A worker stands on a support and with the help of a block will lift the load evenly, the weight of which is 480 H (fig. 216). calculate the pressure produced by the support worker, if his weight is 720 N, and the foot area is 320 cm² (Friction and block weight can be neglected.)

Answer:

An electric motor converts electrical energy into mechanical energy. The process is as follows:

D. When current flows through the motor, it powers electromagnets that are attracted and repelled by the poles of permanent magnets in the motor. The movement of the electromagnets turns a rod in the motor, which makes the mechanical energy available.

The magnitude of the net force on the car and trailer system is 5000 N.

The magnitude of the net force on the car and trailer system can be calculated by subtracting the frictional force from the force exerted by the car's engine. In this case, the engine exerts a force of 6000 N and the frictional force is 1000 N. Therefore, the net force is 6000 N - 1000 N = 5000 N. So, the correct answer is c. 5000 N.

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Answer:

10

Explanation:

Answer:

The SI units for energy is Joules.

Answer: Joules

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The motion of an object thrown at an angle is projectile motion

Projectile(missile designed to be fired from rocket)

Answer:

Explanation:

Newton's first law of motion:

An object in motion stays in motion, and an object at rest stays at rest, until acted upon by an unbalanced force.

Newton's second law:

The net force on an object is equal to its mass times its acceleration.

Newton's third law:

For every action, there is an opposite and equal reaction.

Answer:

The velocity

Explanation:

Kinetic energy of an object is directly proportional to the square of its velocity if mass if kept constant. Therefore, if the velocity is doubled the kinetic energy increases four times.

K.E= 1/2mv²

m is the mass of the object and v the velocity. This means that there must be motion for there to be kinetic energy.

Velocity = √((Centrifugal force *  radius)/mass)

Velocity = √(533 * 0.75 / 16.4)

Velocity = √(399.75 / 16.4)

Velocity = √24.375

Velocity = 4.9 m/s

Answer:

4.9

Explanation:

I just did it

Answer:

to absorb extra light- E.

Answer:

E.

Explanation:

Curved mirrors absorb more light that the flat ones, this means that the image you're gonna get it has more information, you can see more.

That's why curved mirror are also used to vigilance in stores for example. Because allows you to see a more panoramic view due to the extra light reflection.

Answer:

[tex]2.67\cdot 10^6 s[/tex]

Explanation:

The radio signal travels to us at the speed of light, so at a speed of

[tex]c=3.0\cdot 10^8 m/s[/tex]

The distance between the spaceship and the Earth is

[tex]d = 8\cdot 10^{14}m[/tex]

Since the signal travel by uniform motion, we can write

[tex]d = vt[/tex]

where

t is the time the signal needs to reach the Earth

By solving the equation for t, we find

[tex]t=\frac{d}{v}=\frac{8\cdot 10^{14} m}{3.0\cdot 10^8 m/s}=2.67\cdot 10^6 s[/tex]

Answer:

Explanation:

In our previous articles, we observed the theoretical formulas of Ohm’s law, its calculations in the lab report, and experiment. Today you’ll learn the verification of theory vs experimental results on a 1 kΩ resistor.

The theoretical results are obtained from the formula of Ohm’s law: V = IR. The experimental verification is provided for a metal film 1 kΩ (±0.05%). We have used a high-quality resistor with negligible tolerance value so as to reduce the tolerance error.

The little problem in our calculations arises due to improper handling of multimeter probes. You can learn the complete method to perform the Ohm’s experiment here and can calculate the current values by using the Ohm’s law calculator.

It’s called velocity. Velocity is a vector quantity so it’s basically the same thing as speed but the difference is it’s speed in a certain direction.

Answer:

The speed and direction with which an object moves is its velocity.

Explanation:

Velocity is the speed of an object with a given direction.

Hope this helps.

Answer:

Explanation:

ur right i think

Ur right gimme brainlyest

A fly and an eagle could have the same kinetic energy if the fly compensates its smaller mass by flying at a much higher velocity, whereas the eagle, which has a larger mass, would fly at a slower speed to achieve the same kinetic energy. This is a direct result of the kinetic energy formula and the principle of conservation of energy.

The scenario where a fly and an eagle have the same kinetic energy is actually possible. Kinetic energy, which is the energy an object possesses due to its motion, can be calculated using the formula ½mv², where 'm' is the mass of the object and 'v' is its velocity. For the fly and the eagle to have the same kinetic energy, the fly, which has a much smaller mass compared to the eagle, must compensate by having a much higher velocity. Conversely, the eagle with a larger mass can have the same kinetic energy by flying at a lower velocity.

For example, if we consider the kinetic energy formula, a very light fly (let's say 0.002 kg) moving at a high speed (say 20 m/s) would have a kinetic energy of 0.4 Joules. In comparison, a massive eagle (for instance, 4 kg) would only need to fly at around 0.14 m/s to have the same kinetic energy of 0.4 Joules. This illustrates how mass and velocity can vary inversely for different objects to have equivalent kinetic energies.

While it might seem counterintuitive, this is a direct consequence of conservation of energy and the kinetic energy relationship. The concept that energy cannot be created or destroyed, but only transferred or transformed, means that two vastly different animals could have the same kinetic energy if their masses and velocities are complementary.

Answer:

B) Boiling it at its boiling point

Explanation:

As we know that the heat required to convert the given substance from liquid to vapor at its boiling point is known as latent heat of vaporization

So here we know that

[tex]Q = mL[/tex]

here we know that

[tex]L = \frac{Q}{m}[/tex]

so it is known as the heat required to boil the given substance of unit mass at its boiling point

so correct answer will be

B) Boiling it at its boiling point

This is true. The break handles and brakes are levers and the seat adjustment (raise or lower) is a screw.

Answer:

True.

Explanation:

A bicycle is a compound machine.

Answer:In the similar way, a changing magnetic field produces an electric current in a wire or conductor. The relationship between electricity and magnetism is called electromagnetism.

Explanation:

Final answer:

Electricity and magnetism are closely related, where changing electric currents produce magnetic fields and changing magnetic fields induce electric currents. This principle, known as electromagnetism, is fundamental to many technologies and reflects an underlying symmetry in nature.

Explanation:

The interconnection between electricity and magnetism is a cornerstone of the field of electromagnetism. These two phenomena are so intertwined that a change in electric current can produce a magnetic field, and conversely, a change in a magnetic field can induce electric current. This concept is crucial to many technological advances such as generators, transformers, and various electronic devices that are essential to modern life.

For instance, when an electric current flows through a wire, it creates a surrounding magnetic field. If this magnetic field varies, it can induce a current in another nearby circuit, a principle known as magnetic induction. This is the fundamental process behind the operation of electrical generators and transformers. Historical experiments, including those by scientists such as Michael Faraday and Joseph Henry, have shown that electricity can produce magnetism and vice versa.

When there is direct relationship the car moves with respect to time.

The direct relationship in the graph shows that the position of the car positively changes as time elapses because there is a direct relationship between position and time.

Direct relationship means when one factor increases the other also increases whereas one decreases the other also decreases so we can conclude that when there is direct relationship the car moves with respect to time.

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Answer: Increases

This direct relationship graph shows that the position of the car

increases as time elapses.

Explanation:  got 100 percent on edge

Answer:

Explanation:

There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

Answer:

D. If it has coarse grains, then it cooled slowly beneath the surface of the Earth. If it has fine grains, then it cooled rapidly on the Earth's surface.

Explanation:

The easiest way for a geologist to identify where the igneous rocks have formed is to look at their grains. There's two types of igneous rocks, intrusive and extrusive. The intrusive igneous rocks have formed from the magma that has cooled off slowly deeper into the crust, thus their crystals had more time to grown, and they have coarse grains. The extrusive igneous rocks have formed from the lava that has cooled off quickly on the surface, thus their crystals had very little time to grow, so they have fine grains.

The correct option is D. If it has coarse grains, then it cooled slowly beneath the surface of the earth. If it has fine grains, then it cooled rapidly on the earth's surface.

To understand why option D is correct, let's consider the processes of igneous rock formation and the factors that influence grain size:

 1. Intrusive (plutonic) rocks are formed from magma that cools and solidifies within the Earth's crust. This slow cooling process allows for the formation of large crystals, resulting in coarse-grained rocks. Since the cooling is slow, the mineral ions have more time to move and form larger crystals. Examples of intrusive rocks include granite and gabbro.

2. Extrusive (volcanic) rocks are formed from lava that cools and solidifies on the Earth's surface. This rapid cooling process does not allow much time for crystal growth, resulting in fine-grained or aphanitic rocks. The rapid cooling rate traps the mineral ions before they can organize into larger crystals, leading to a rock with small, barely visible crystals. Examples of extrusive rocks include basalt and rhyolite.

Therefore, the identification of the environment in which an igneous rock was formed is based on the texture of the rock, which is indicative of the cooling rate:

 - Coarse grains (phaneritic texture): The rock cooled slowly, which typically occurs beneath the Earth's surface where the surrounding rock acts as an insulator, slowing down the cooling process. This is characteristic of intrusive rocks.

 - Fine grains (aphanitic texture): The rock cooled rapidly, which typically occurs on the Earth's surface where the lava is exposed to the atmosphere or water, leading to quick heat loss. This is characteristic of extrusive rocks.

Based on this understanding, the correct identification is:

- If an igneous rock has coarse grains, it cooled slowly beneath the surface of the earth (intrusive).

- If an igneous rock has fine grains, it cooled rapidly on the earth's surface (extrusive).

 Hence, option D is the correct answer.

I = 2A.

The easiest way to solve this problem is using Ohm's Law equation I = V/R.

The battery in the circuit is V = 24V and the resistance R = 12Ω,  to calculate the current we use the equation above:

I = 24V/12Ω = 2A

Using Ohm's law, which states that current equals voltage divided by resistance, the current in a circuit with a 24-volt battery and a 12-ohm resistance is found to be 2 amperes.

To calculate the current in a circuit with a given voltage and resistance, we can apply Ohm's law, which states that current (I) equals voltage (V) divided by resistance (R). In this case, we are given a 24-volt battery and a resistance of 12 ohms.To calculate the current in a circuit with a given voltage and resistance, we can apply Ohm's law, which states that current (I) equals voltage (V) divided by resistance (R). In this case, we are given a 24-volt battery and a resistance of 12 ohms. Using Ohm's law:

I = V / R

I = 24 V / 12 Ω

I = 2 A

Therefore, the current flowing through the circuit is 2 amperes (A).

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Answer:

The remainder of the hydrogen atom's mass comes from the positively charged proton. The atomic number of an element is the number of protons in its nucleus. Neutrons are neutral particles having a mass slightly greater than that of the proton. Different isotopes of the same element contain the same number of protons but differing numbers of neutrons.

Explanation:

The change in the kinetic energy of the runner will be 1350 J. It is found by subtracting the kinetic energy during two different velocity.

The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.

According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.

The change in the kinetic energy is found as;

[tex]\rm KE = \frac{1}{2} m(v^2-u^2)\\\\ KE = \frac{1}{2} \times 60 (9^2-6^2) \\\\ KE=1350 \ J[/tex]

Hence, the change in the kinetic energy of the runner will be 1350 J.

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Answer:

10 m/s²

Explanation:

Newton's second law:

∑F = ma

10 N = (1 kg) a

a = 10 m/s²

Radio waves, Middle-C, and halitosis are not forms of light.

All of the above are forms of light. Therefore, the correct option is option D among all the given options.

Light as well as visible light is electromagnetic that is visible to the human eye. Here between infrared and ultraviolet ranges, visible light is commonly defined as having wavelengths of 400-700 nanometres (nm) or frequencies of 750-420 terahertz.

In physics, the term "light" can be used to more broadly characterize electromagnetic radiation of any wavelength, whether visible or not. Gamma rays, X-rays, microwaves, and radio waves are all forms of light in this sense. All of the above are forms of light.

Therefore, the correct option is option D.

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Your question is incomplete but most probably your full question was,  

Which of the following is not a form of light?

A) radio waves

B) microwaves

C) x-rays

D) All of the above are forms of light.

E) None of the above is a form of light

Answer:

344.8 Hz

Explanation:

The frequency of a wave is given by:

[tex]f=\frac{v}{\lambda}[/tex]

where

v is the speed of the wave

[tex]\lambda[/tex] is its wavelength

Here we have

v = 793 m/s

[tex]\lambda=2.3 m[/tex]

Substituting into the equation, we find

[tex]f=\frac{793 m/s}{2.3 m}=344.8 Hz[/tex]

Answer:

the answer I think is A im so sorry if its wrong

Explanation:

Because yes we do have gases collapsing we also have dust collapsing with it and surrounding it to make a disk type of air flow that pushes it that makes it rotate if that makes sense. yet again super sorry if its wrong.

Answer:

the answer is actually B

Explanation:

When our solar system formed out of a gas cloud, called a nebula, there was lots of dust and gas coming together due to the force of gravity. The dust and gas was already moving around in a circle. As it all clumped together to form the Sun and planets, these new objects started to spin – and then spin faster.

i hope this helps!!!

Answer:

180 m

Explanation:

The rock follows a free-fall motion - so the vertical distance covered can be found by using the equation

[tex]h=\frac{1}{2}gt^2[/tex]

where

g = 10 m/s^2 is the acceleration due to gravity

t = 6.00 s is the time of the fall

Substituting these data, we find the height of the cliff:

[tex]h=\frac{1}{2}(10 m/s^2)(6.00 s)^2=180 m[/tex]

The height of the cliff from which the rock is dropped can be calculated using the formula h = 0.5*g*t². This gives us a calculated height of 180 meters.

The problem you're dealing with is related to one of the basic physics equations of motion, specifically for an object under constant acceleration - in this case, the acceleration due to gravity. To find the height of the cliff, we can use the formula h = 0.5*g*t², where 'h' is the height, 'g' is the acceleration due to gravity (10.0 m/s² as provided), and 't' is the time it takes for the rock to hit the ground (6.0 seconds in this problem).

Plugging in the known values into the equation gives us h= 0.5*10.0*(6.0)² = 180.0 meters. This means the cliff is approximately 180 meters high.

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voltage = current * resistance

so

current = voltage/resistance

therefore,

current = 6/3 A = 2 A

Answer:

tratamento de lei ohm

Explanation:

Answer:

392 J

Explanation:

Gravitational potential energy is:

PE = mgh

where m is mass, g is acceleration of gravity, and h is the height.

PE = (5 kg) (9.8 m/s²) (8 m)

PE = 392 J