at the orbit of venus (67 million km from the sun), the apparent brightness (in units of watts/m2) is:

Answer:

Power = 20 Watts

Explanation:

Given the following data;

Voltage = 100 V

Resistance = 500 Ohms

To find the power that is required to light a lightbulb;

Mathematically, power can be calculated using the formula;

\( Power = \frac {Voltage^{2}}{resistance} \)

Substituting into the formula, we have;

\( Power = \frac {100^{2}}{500} \)

\( Power = \frac {10000}{500} \)

Power = 20 Watts

Answer:

    flow of electron is just opposite to the flow for current. Electrons flow from the negative terminal to the positive. Conventional current or simply current, behaves as if positive charge carriers cause current flow. Conventional current flows from the positive terminal to the negative.

When you blow across the open mouth of an empty test tube, you create a standing wave in the 14.0 cm-long air column inside the tube. This column of air acts as a stopped pipe. The speed of sound in air is given as 344 m/s. the frequency of the fundamental standing wave in the test tube is 614.3 Hz.

To find the frequency of the fundamental standing wave in the test tube, we can use the formula:
frequency = speed of sound / wavelength

Since the test tube is acting as a stopped pipe, we know that the length of the air column is equal to a quarter of the wavelength of the fundamental standing wave.
So, the wavelength of the fundamental standing wave in the test tube is four times the length of the air column, which is 4 * 14.0 cm = 56.0 cm.

Now, we can substitute the values into the formula:
frequency = 344 m/s / 56.0 cm

Before we can continue, we need to convert the wavelength from centimeters to meters:
56.0 cm = 0.56 m

Now, we can substitute the values and solve for the frequency:
frequency = 344 m/s / 0.56 m = 614.3 Hz

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Answer:

←13

Explanation:

You see the two men pushing it the opposite direction from each other. When you see different net forces you subtract the numbers from each other. So 53- 40=13. You see which value holds the greatest amount and say that the answer you got is supposed to be that side of the net force. The answer is "13 net force to the left, OR ←13"

When dealing with an electrical emergency involving a downed power line, it is important to follow certain safety precautions to avoid injury or further damage.

First, stay at least 10 meters (around 33 feet) away from the downed power line and any objects that it may be touching, as they could potentially be electrified.

Next, call 911 to report the downed power line and warn others in the area to stay away.

Do not attempt to move the power line or any objects it may be touching, as this could result in serious injury or death. Wait for emergency responders to arrive and follow their instructions. Remember, safety should always be the top priority in any electrical emergency.

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Answer:

142 weeks/52 weeks per year = 2.7 years

so the answer is 2.7 years

Explanation:

Answer:

The velocity is \(u = 19.1 \ m/s\)  

Explanation:

From the question we are told that

  The time taken by the ball is  t =  2.5 seconds

  The angle made with the horizontal is \(\theta = 40^o\)

Generally the vertical component of the initial velocity is mathematically represented as

         \(u_y = u sin (\theta )\)

Generally at maximum height of the ball the velocity is  v  =  0 m/s and  the time take to reach this maximum height is

    =>         \(t_m = \frac{t}{2} = \frac{2.5}{2} = 1.245 \ s\)  [This because t is duration for the to a fro travel of the ball]

Generally from kinematic equation

        \(v = u_y + gt\)

Here  \(g = -9.8 m/s^2\) given that the direction is against gravity

=>     \(0 = u sin (40) - 9.8 * [1.25]\)

=>     \(0 = 0.6428u - 12.25\)  

=>     \(u = 19.1 \ m/s\)  

Answer:

Two orbitals for their electrons and six in the 2p subshell

Explanation:

Hope this helps :)

To find the time it took for the car to accelerate, you can use the formula:

t = (v - u) / a

where t is the time, v is the final velocity, u is the initial velocity, and a is the acceleration.

Plugging in the given values, you get:

t = (26 m/s - 19 m/s) / (205 m / t^2)

You can then rearrange the equation to solve for t:

t = sqrt(205 m / (26 m/s - 19 m/s))

Solving for t, you get:

t = sqrt(205 m / 7 m/s) = sqrt(29.3 s^2) = 5.4 s

So it took the car approximately 5.4 seconds to accelerate from 19 m/s to 26 m/s.

Answer:

We want to have an acceleration of:

A = 1.5*g = 1.5*9.8m/s^2  = 14.7 m/s^2

When the rim is moving at 37m/s while spinning.

Now, in circular motion we have two accelerations.

Tangential acceleration, that is the one related to the change of speed, as we have a speed of 37m/s, we can assume that is constant, then the tangential acceleration is zero.

Centripetal acceleration, is the one related to the change in direction, is perpendicular to the velocity vector and is the one that allows the circular motion.

I suppose that in this problem we want to have a  centripetal acceleration of 14.7m/s^2

The equation for the centripetal acceleration is:

Ac = v^2/r

Where v = velocity and r = radius.

then we must solve:

14.7m/s^2 = (37m/s)^2/r

r = (37m/s)^2/14.7m/s^2 = 93.13 m

Answer:

The pressure value changes 400 % relative to the initial value.

Explanation:

Let suppose that the gas behaves ideally and represents a closed system, that is, a system with no mass interactions so that number of moles is conserved (\(n\)). Since the variables involved in the isothermal process are pressure (\(P\)) and volume (\(V\)). Finally, the process is represented by the following relationship:

\(P_{1}\cdot V_{1} = P_{2}\cdot V_{2}\) (1)

Where:

\(P_{1}, P_{2}\) - Initial and final pressures.

\(V_{1}, V_{2}\) - Initial and final volumes.

If we know that \(P_{1} = P_{o}\), \(V_{1} = V_{o}\) and \(V_{2} = 0.2\cdot V_{o}\), then the final pressure of the closed system is:

\(P_{2} = P_{1}\cdot \left(\frac{V_{1}}{V_{2}} \right)\)

\(P_{2} = 5\cdot P_{o}\)

The pressure value changes 400 % relative to the initial value.

The magnitude of the second charge is calculated using Coulomb's law. The magnitude of the second charge is 0.00022 C.

Coulomb's law states the force exerted between two charges is directly proportional to magnitude of charges and inversely proportional to their distance.

F =  k q1 q1/r²

where k is a constant equal to 8 × 10⁹ Nm²/C²

Given F = 9 N

q1 = - 0.0005 C

r = 10 m

9 N = - 0.0005 C ×  q2 × 8 × 10⁹ Nm²/C² /(100 m²)

q2 = 9 N × 100 m² / (- 0.0005 C ×8 × 10⁹ Nm²/C²  )

    = 0.00025 C

Therefore, the magnitude of the second charge here is 0.00025 C.

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The magnitude of the second charge is 3.6 x 10⁻⁶ C.

The electric charge carried by a single proton, or alternatively, the magnitude of the electric charge carried by a single electron, which has charge e, is the elementary charge, which is often represented as e or occasionally q. This fundamental physical constant is this elemental charge.

The electric force between two point charges is given by Coulomb's law:

F = kq₁q₂ / r²

where F is the force between the charges,

k is Coulomb's constant (9 x 10⁹ N·m²/C²),

q₁ and q₂ are the magnitudes of the charges,

and r is the distance between them.

In this problem, we are given the force between two charges and one of the charges.

We can rearrange Coulomb's law to solve for the magnitude of the second charge:

q₂ = F * r² / (k * q₁)

Substituting the given values, we get:

q₂ = 9.0 N * (10 m)² / (9 x 10⁹ N·m²/C² * 0.0005 C)

q₂ = 3.6 x 10⁻⁶ C

Therefore, the magnitude of the second charge is 3.6 x 10⁻⁶ C.

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Answer: 3 kg

Explanation:

The formula for potential energy is Ug=mgh where Ug is potiental energy, m is mass, g is the acceleration caused by gravity which is either 9.8 m/s^2 or 10m/s^2 depending on your textbook and h is the height and or displacement. So…

120 = m(10)(4)

120=40m

m= 3 kg

Answer:

Explanation:

Given:

h = 4 m

W = 120 J

g = 10m/s²

_________

m - ?

W = m*g*h

m = W / (g*h) = 120 / (10*4) = 3 kg

Answer:D

Explanation:

i’m not sure if that’s right but that’s what i think

Answer:That only applies to highly polished surfaces, eg mirrors.

If you take a high quality laser (ie with low divergence) and aim it at a wall, you can see the spot where the laser beam reaches the wall from anywhere with a direct line-of-sight to the spot where the laser beam reaches the wall. This due to micro imperfections on the surface of the wall. At a microscopic level, the wall surface is very rough and pointing in all directions.

As to why, a beam of light bounces of a highly polished surface, I can only surmise that it is essentially due to kinematics, ie the only force opposing the light beam is normal to the surface, hence there no forces along the reflective surface. Since there are no forces along the reflective surface, the speed component of light along the reflective surface remains unchanged. However, on the plane perpendicular to the reflective surface the, the light photons bounce off at the same speed at which the hit the reflective surface because the mass of the reflective surface is much much much larger than the mass of the photons, which means that the reflective surface won’t move at all. Since conservation of momentum requires that momentum after the collision be the same as the momentum before the collision then the only way for that to happen is if the velocity of the photon perpendicular to the reflective surface is of exactly the same magnitude but in the opposite direction. Vector resolution of the speed component of the reflected beam means that the angle of reflection must be the same as the angle of incidence.

Explanation:

Answer:

I dont know answer Sorry For that thank u

The primary cause of injuries from motorcycle collisions is the exposed position of the rider. (Option B)

Motorcycle collisions often result in injuries due to the vulnerability of the rider's position. Unlike occupants of cars or other vehicles, motorcycle riders lack the protection of an enclosed vehicle, making them more susceptible to injuries. In the event of a collision, riders are directly exposed to external forces and can be thrown from the motorcycle, leading to severe injuries such as fractures, abrasions, head trauma, and spinal cord injuries.

While other factors like other vehicles hitting them or driving too fast can contribute to the severity of injuries, the exposed position of the rider remains the primary cause. Therefore, option B is the correct answer.

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The spacecraft that got the closest to the nucleus of Halley's Comet and sent back dramatic photographs of what the nucleus looked like was the European Space Agency's (ESA) Giotto spacecraft.

The Giotto spacecraft was launched on July 2, 1985, and on March 13, 1986, it passed within 596 kilometers (370 miles) of Halley's comet's nucleus. It was able to send back spectacular photographs of the comet's nucleus.

The Giotto mission was a joint European Space Agency (ESA) project with contributions from 14 European countries. It was named after the Italian artist Giotto di Bondone because the probe's camera had the same field of view as the artist's sketch of Halley's comet in 1301.

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The average torque exerted on the disk by the hand is -5.49 Nm.

Torque can be defined as a force exerted at a distance from the axis of rotation.

To find the average torque exerted on the disk, we need to calculate the angular acceleration and then use the equation for torque:

Torque = I * alpha, where I is the moment of inertia and alpha is the angular acceleration.

First, let's find the angular acceleration:

Initial angular velocity = 35 rad/s

Final angular velocity = 0 rad/s

Time = 0.15 s

Using the kinematic equation for angular acceleration:

alpha = (Final angular velocity - Initial angular velocity) / Time

alpha = (0 - 35) / 0.15

alpha = -233.33 rad/s^2

Next, let's find the moment of inertia of the solid disk:

I = (1/2) * m * r^2

I = (1/2) * 0.165 kg * (0.215 m)^2

I = 0.0234 kg m^2

Finally, let's find the average torque:

Torque = I * alpha

Torque = 0.0234 kg m^2 * -233.33 rad/s^2

Torque = -5.49 Nm

Therefore, The average torque exerted on the disk by the hand is -5.49 Nm.

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Answer:

D.)

Explanation:

the current separates on each branch according to the resistance it experience.

Answer:D

Explanation:

The magnetic force is 0.74T and acceleration of the Moun is calculated as 2.66*10^16 m/s^2

Data;

The formula of magnetic field force is given by

\(F =BqV\)

Let's make the magnetic field force the subject of formula

\(F=BqV\\B = \frac{F}{qV}\\B = \frac{5.00*10^-^1^2}{1.60*10^-^1^9 * 4.21*10^7} \\B = 0.74T\)

The magnetic force is 0.74T

The acceleration of moun can be calculated as

\(F=ma\\a = F/m\\a = \frac{5.0*10^-^1^2}{1.88*10^-^2^8} \\a = 2.66*10^1^6m/s^2\)

The acceleration of the Moun is calculated as 2.66*10^16 m/s^2

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In flow separation, wake is defined as the region of flow trailing the body where the effects of the body on velocity are felt. The given statement is true. In flow separation, the wake is the region behind the body where the effects of the body on velocity are felt.

A pitot tube is used to measure only pressure head in a pipe flow. The given statement is false. Pitot tubes are used to measure both the stagnation pressure and the static pressure in a pipe flow.

The depth for nonuniform flow conditions is called normal depth. The given statement is false. Non-uniform flow is a type of fluid flow that is not constant throughout the flow's depth. The water depth in non-uniform flow is referred to as critical depth, not normal depth. The critical depth is the depth of flow at which the specific energy of a channel is a minimum for a given discharge.

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Answer:

it begins to move to the right! :)

A mass of will allow the following mobile to maintain static equilibrium.

In the given figure, we can clearly see that the rods are horizontal and also it's given that they are in static equilibrium.

Therefore we can conclude that the torque on the points connecting the rods is equal due to 0.1 kg and m1 masses

So,

(0.1 kg) × (0.1 m) = (0.2 m) × (m1)

m1 = 0.05 kg

Applying the same procedure of equating torque with the combined mass of 0.1kg and 0.05 kg and m2,

we get,

(0.15 kg) × (0.2 m) = (0.4 m) × (m2)

m2 = 0.075 kg

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70.934648 MJ of work is needed to pump the water out of the spout.

The tank is shaped like a globe. the distance to the mass's center = h+r =6+2=8

Weight of water in tank = 9.8×π×6³×1000×4/3

= 8.866831×10⁶ N

to empty the tank Work done  = 8 × 8.866831×10⁶

=70.934648×10⁶ J

= 70.934648 MJ.

A pump is a mechanical device used to transport fluids (liquids, gases, or occasionally slurries). It commonly converts electrical energy into hydraulic energy. Pumps can be divided into three main categories based on how they move the fluid: direct lift, displacement, and gravity pumps.

Pumps use a mechanism to move the fluid (usually a rotary or reciprocating one) and require energy to operate. Pumps exist in a variety of sizes, from microscopic for use in medical applications to enormous industrial pumps, and they can be powered by a variety of energy sources, including electricity, manual operation, engines, or wind power.

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Answer:

The height of the roof is 4 meters high. Is this the measurement that I was supposed to answer with?

Explanation:

Answer:

average speed, accelerated speed

Explanation:

Pace was first moving at 38 km/h which was his average speed but the fastest speed he went was 60 km/h so he accelerated.

Answer:

1. Government Agencies

2. Television Stations

Explanation:

Weather reports are needed by members of the public to be alert on daily and future weather trends as this would affect how they arrange their affairs. The weather can affect daily movement. For example, when it rains heavily, movement might become limited. Government agencies such as the National Weather Service (NWS), state the weather report.

Television channels like the Cable News Network have programs dedicated to weather reporting. The reporter states what the weather would be like in different cities and the public take note of that.

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