two children are playing on a see-saw. the see-saw is composed of a wooden board of mass 40 kg and of length 8 m and a pivot which is placed 0.5 m to the right of the center of the wooden board. the first child who has a mass of 29.3 kg sits at the right end of wooden board. the second child has a mass of 50 kg. what is the distance in meters from the left end of the wooden board that the second child must sit for the wooden board to be in static equilibrium?

At the time of the summer solstice, the noontime altitude of the sun is at its highest point, around 90°.

Altitude is the height above sea level. It is typically measured in either metres or feet. In aviation, altitude can also refer to the vertical distance between an aircraft and a certain reference point on the ground. Altitude can be used to determine the air pressure, temperature, and density of the air. Altitude can also be used to calculate the distance a plane can travel without refueling. Altitude can play an important role in the weather of an area, as air pressure and temperature tend to decrease with altitude. Altitude can also affect the type of vegetation found in an area. In mountain regions, the altitude can have a dramatic effect on the climate, creating distinct areas of vegetation and wildlife. Altitude can also affect the types of crops that can be grown in an area, depending on the air pressure, temperature, and precipitation.

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Answer:

1st one is: A

2nd one is: B

Answer: c

Explanation: 125/20 =6.25

The radio waves used in television transmissions.

Lower frequency electromagnetic waves than microwaves are radio waves.

Radio waves have wavelengths that range from tens of thousands of metres to 30 centimetres. These are equivalent to frequencies between 3 Hz and 1 GHz (109 Hz).

Straight-line radio-wave communication signals pass through the atmosphere, reflect off of clouds or ionosphere layers, or are transmitted by satellites in space.

They are utilised in remote-controlled toys as well as traditional broadcast radio and television, shortwave radio, navigation and air traffic control, and more.

Particularly, the wavelengths of television waves range from around 50 centimetres to about 10 metres.

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Samuel and David are in the weight room bench pressing the same 900 N weight. If David has longer arms than Samuel, then David does more work on the weight while bench pressing.

This is referred to as the energy transferred to or from an object via the application of force along a displacement. It is calculated by the following below and the unit is in Joules.

Work = F × s  where f is force and s is displacement.

People who have longer arm spans will have a greater total distance to push the bar in order to reach the 120 degrees angle of elbow flexion. This means that there will be more work done in this scenario and is therefore the reason why David does more work on the weight while bench pressing and is therefore the reason why it was chosen as the correct choice.

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Answer:

Erosion of Mountains

Explanation:

Answer:

c gimme brainliest I'm right

Answer:

41

Explanation:

and your welcome

The answer is that it is important to maintain a constant glide speed when executing an emergency approach to land in a single-engine airplane because variations in glide speed can nullify all attempts at accuracy in judgment of gliding distance and landing spot.



During an emergency approach to land, the pilot must ensure that the airplane descends at the proper angle to reach the desired landing spot. This angle is achieved by maintaining a constant glide speed. Any variations in glide speed can cause the airplane to either climb or descend, resulting in inaccurate judgment of the gliding distance and landing spot. This is why it is crucial to maintain a constant glide speed during an emergency approach to land.

It would also touch on the potential consequences of not maintaining a constant glide speed. For example, variations in glide speed can increase the chances of shock cooling the engine. Shock cooling refers to the rapid cooling of the engine cylinders caused by a sudden decrease in engine power. This can cause damage to the engine and reduce its overall lifespan.

In summary, maintaining a constant glide speed during an emergency approach to land is important for ensuring accuracy in judgment of gliding distance and landing spot, as well as preventing potential damage to the engine.

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When the ball on the left is pulled to the side and released, it will swing back and hit the ball on the right. Upon impact, the momentum of the left ball will be transferred to the right ball, causing the right ball to start swinging to the right while the left ball will come to a stop.

Therefore, the correct answer is: "The ball on the right will swing to the right." Option C

In physics, momentum is a property of moving objects that is determined by both their mass and velocity. It is defined as the product of an object's mass and velocity, and it is a vector quantity, which means it has both magnitude and direction.

Mathematically, momentum (p) is expressed as:

p = m * v

where m is the mass of the object and v is its velocity.

Momentum is conserved in a closed system, meaning that the total momentum of the system remains constant unless an external force acts on it. This is known as the law of conservation of momentum, which is a fundamental principle of physics. The law of conservation of momentum has many practical applications, from understanding the behavior of collisions in billiards or car accidents, to designing spacecraft trajectories, to studying the behavior of subatomic particles

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Answer:

B.white block

hope it's the answer ....❤❤❤❤❤❤

11.16 m/s.

Notice I'm not telling you whether that's up or down, because you only asked for the speed, which has no direction.

This would have been a great question to ask for the ball's velocity.

The speed of the ball moving under gravitational force after 4.2 s is 11.16 m/s.

Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.

Initial upward speed of the ball = 30.0 m/s.

Acceleration due to gravity acting downwards is = 9.8 m/s²

Time interval = 4.2 s.

Hence, final speed of the ball is = u - gt

= (30.0 - 9.8×4.2) m/s

= - 11.16 m/s

Negative sigh refers that the motion is downwards and the speed of the ball moving under gravitational force after 4.2 s is 11.16 m/s.

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The kinetic energy (KE) of the emitted photoelectrons in the Sodium surface will be: lower compared to the KE of the photoelectrons in the Potassium surface.

The work function of a material is the minimum amount of energy required to remove an electron from its surface. If the work function of Sodium is greater than that of Potassium, it means that Sodium requires more energy to remove electrons compared to Potassium.

When photons of the same wavelength are incident on both surfaces, the energy of the photons is given by E = hf, where h is Planck's constant and f is the frequency of the photons (related to the wavelength).

For the photoelectric effect to occur, the energy of the incident photons must exceed the work function of the material. Since Sodium has a higher work function than Potassium, it will require photons with higher energy to exceed its work function and emit photoelectrons.

Therefore, the photons incident on the Sodium surface, despite having the same wavelength as those incident on the Potassium surface, will have lower energy. As a result, the kinetic energy of the emitted photoelectrons in the Sodium surface will be lower compared to the kinetic energy of the photoelectrons in the Potassium surface.

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With a plane mirror, the distance of the image behind the mirror is infinitely far. The greatest distance behind the mirror at which the image can be found is infinite.

For plane mirrors, the object distance is equal to the image distance and hence, the image is the same distance behind the mirror as the object is in front of the mirror.

The image distance from mirror does not depend on the distance of the observer from mirror. Therefore, if we change the object's distance then only the image distance or distance between object and image will be affected.

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Blocks x and y exerts action-reaction forces on each other with 146.1 N and 53.1 N respectively.

The given parameters:

mass of block x = 10 kg

mass of block y = 5 kg

magnitude of the frictional force of block x = 8 N

magnitude of the frictional force of block y = 4 N

the applied force to the right = 40 N

To find:

The block y pulls block x to the left with the following reaction forces;

Force of block y = force due to its own weight + frictional force

where;

g is the acceleration due to gravity = 9.81 m/s²

Thus, block y reacts on block x with a force of 53.1 N

The block x acts on block y towards the right direction with following forces;

Force of block x on y =  force due to its own weight + frictional force + applied force to the right

Thus, block x acts on block y with a force of 146.1 N

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The calculated answer is 2 m/s. The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity.

The energy that drives motion is known as kinetic energy (KE). Kinetic energy is the force that drives motion. The mass and speed of an object moving determine how much kinetic energy it has. The formula for calculating it is

KE = 1 2 mass velocity 2.

The relationship between kinetic energy and an object's mass and square of its velocity is direct:

K.E. = 1/2 m v2.

The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilograms and the velocity is measured in meters per second.

4= 1*v²

=2 m/s

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The weight of the rock at the surface of Venus is 66.5 N

What is the weight of the rock at the surface of Venus ?

On earth,

The weight of the rock at the surface of earth = 75 N

The weight of an object on earth's surface is:

W = m g

Here, m = mass of rock

acceleration due to gravity (g) = 10 m/s²

W= mg

m = \(\frac{W}{g}\)

m = \(\frac{75}{10}\)

m = 7.5 kg

On Venus,

mass (m) = 7.5 kg

acceleration due to gravity(g) = 8.87 m/s²

W= mg

  = 7.5 * 8.87

   =66.5 N

What is acceleration due to gravity?

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Answer:

800N

Explanation:

as we know that

weight = mass × acceleration due to gravity

= 80kg × 10 m/s^2

= 800N.

Option A and B are correct.

We have a spinning satellite which begins to unfold two solar panels as shown in the figure.

We have to investigate which of the given statements are true.

The relation the linear velocity (v) and angular velocity (ω) of a body undergoing circular motion in the circle of radius r is -

v = rω

According to the question - two solar panels unfolded themselves. The key point to understand here is that initially when the panels were folded, each and every individual particle inside the panel were closer to the rotational axis. However, when they unfolded, each and every particle inside the panels went away from the rotational axis. In a general sense, for a individual particle inside the panel, assume that initially the its distance from center was 'r' and after unfolding it became 'R' such that R > r. Therefore, using the formula -

v = rω

ω = \(\frac{v}{r}\)

Now, ω \(\alpha\) \(\frac{1}{r}\) ,

As r increased to R, the angular velocity decreases.

Now, we know that the angular momentum (L) is given by -

L = mvr

As r increases, L increases.

Therefore, the angular momentum increases.

Hence, Option A and B are correct.

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Answer:

50 horas

Explanation:

Datos:

velocidad inicial: \(v_{i}=0km/h\) (inicia del reposo)

velocidad final: \(v_f=100km/h\)

aceleración: \(a=2km/h^2\)

Usando la formula de la velocidad final con aceleracion constante:

\(v_f=v_i+at\)

donde t es el tiempo.

De la formula anterior despejamos para el tiempo t:

\(t=\frac{v_f-v_i}{a}\)

sustituimos los valores:

\(t=\frac{100km/h-0km/h}{2km/h^2}\\ \\t=\frac{100km/h}{2km/h^2}\\ \\t=50h\)

Answer:

B. different temperatures

Explanation:

Thats how they transfer energy because if one object is hotter then the other, the heat can still be transfer to the other object and make their temperatures the same

If a monopolist is regulated to charge an efficient price, there would be no deadweight loss (DWL) as the price and quantity produced would be the same as in a perfectly competitive market. Therefore, the answer is (a) zero.

In market, the price is equal to the marginal cost (MC) of production, which represents the efficient price.

In a monopoly market, the price is set where marginal revenue (MR) equals marginal cost (MC), which is always higher than the efficient price.

If the regulator sets the price at the efficient level, the monopolist will produce at the same quantity as a perfectly competitive market, and there will be no DWL. Therefore, the answer is (a) zero.

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Weight = (mass) x (gravitational acceleration where the mass is)

Weight = (1360 kg) x (9.8 m/s²)

Weight = 13,328  kg-m/s²

That's 13,328 Newtons

Given:-

To Find: Weight (W).

We know,

W = mg

where,

Thus,

W = (1360 kg)(9.8 m/s²)

→ W = 13,328 N (D)

Explanation:

First we have to descompose velocity, and get Velocity of X and Y side:

Vx = V * cos 30°

Vx = 3 m/s * 0,866...

Vx = 2,598 m/s

Vy = V * sen 30°

Vy = 3 m/s * 0,5

Vy = 1,5 m/s

Lets calculate time of fly:

Firat, lets calulate up time:

uT = (Fv - Iv) / g

uT = (0 m/s - 1,5 m/s) / -9,8 m/s^2

uT = -1,5 m/s / -9,8 m/s^2

uT = 0,15 s

Like up time is equal to down time, time of fly will be:

T =uT + dT

T = 0,15 s + 0,15 s

T = 0,3 s

Now for calculate how far will reach, lets aplicate the formula:

d = Vx * T

d = 2,598 m/s * 0,3 s

d = 0,779 meters

Will reach 0,779 meters

Gud luck

A system which undergoes an adiabatic change. The work done and the change in the internal energy are: W>0,  AE > 0 (option d)

Adiabatic process is a thermodynamic process in which no heat goes into or out of a system and all internal energy is changed by work.

Adiabatic operations are frequently carried out in an insulated container, where the process occurs too quickly for heat to be transferred. Because heat transfers due to a temperature difference between a system and its surroundings, an adiabatic process can occur even when the system is in thermal equilibrium.

The first law of thermodynamics is:

ΔU = Q + W

Where:

ΔU = change in internal energy

Q = heat transfer

W = work done

In the given problem, the internal energy is represented by AE, hence, we can write:

AE = Q + W

Since there is no change in heat energy, Q = 0, therefore,

AE = W

The work done in an adiabatic process is positive. Therefore, the correct answer is W>0,  AE > 0 (option d)

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Answer:

Explanation:

In this problem we are required to find the potential energy possessed by the television

Given data

mass of television m = 15 kg

height  added above the ground, h= 1-0.3 = 0.7 m

acceleration due to gravity g = 9.81 m/s^2

apply the formula for potential energy we have

P.E= m*g*h

P.E = 15*9.81*0.7 = 103 Joules

Answer:

The molecular structure of photovoltaic cells is important for their efficiency because it affects the ability of the cells to absorb and convert light into electricity. The photovoltaic effect, which is the basis of solar cell operation, occurs when photons of light excite electrons within the cell material, causing them to become free from their atomic bonds and creating an electrical current.

The molecular structure of the photovoltaic cell material determines the electronic properties of the material, such as the bandgap energy and the electron mobility, which play a crucial role in the photovoltaic effect. The bandgap energy determines the minimum energy required to excite an electron, and the electron mobility determines how easily the electrons can move within the material.

If the molecular structure is poorly designed, the bandgap energy may be too low to effectively absorb the desired light, or the electron mobility may be too low to allow the electrons to move efficiently, both of which can lead to a reduction in efficiency. On the other hand, if the molecular structure is optimized, the photovoltaic cells can absorb light more effectively, the electrons can move more efficiently, and the overall efficiency of the cells can be improved.

Therefore, the molecular structure of photovoltaic cells is an important factor in determining their efficiency and is carefully considered by scientists and engineers in the design and development of new photovoltaic materials and technologies