The loaded cab of an elevator has a mass of 3.0 x 10 3 kg and moves 200 m up the shaft in 20 s at constant speed. At what average rate does the cable do work on the cab

Answer:

Explanation:

The body's mass is constant as it is a property of the body. Still, weight is a product of acceleration due to gravity and mass, which may vary from place to place because acceleration differs for different places.

One statement that is not true is that UV radiation is a type of electromagnetic radiation. It is also a type of ionizing radiation. UV radiation is actually a form of non-ionizing radiation.

UV radiation, or ultraviolet radiation, is a type of electromagnetic radiation that falls between visible light and X-rays on the electromagnetic spectrum. It is often categorized into three types: UVA, UVB, and UVC. Unlike ionizing radiation, such as X-rays and gamma rays, which have enough energy to remove tightly bound electrons from atoms or molecules, UV radiation lacks the necessary energy to ionize atoms or molecules. Instead, it primarily interacts with the outermost electrons of atoms or molecules, leading to chemical reactions and causing biological effects.

UV radiation is commonly associated with sunlight and has various effects on living organisms and materials. It can cause sunburn, premature aging of the skin, and an increased risk of skin cancer. Exposure to excessive UV radiation can also damage the eyes and impair the immune system. It is important to protect oneself from excessive UV exposure by wearing sunscreen, protective clothing, and sunglasses.

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Answer:

C

Explanation:

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Answer:

i think a and c

Explanation:

Answer:drfdcfrfvgtgy6hbhhbhyg vcfrfr5tgvcfrtg vcdftghegthetrgbdgtthethe3thet

Explanation:

Sdwerftyrujtnyhbvcrdefgswthyujdehrtgfyhrjfuygtdhjueyrtgehwu3y4tgrehjwheyrgdhbnsjhfgvbdnhgfdhjsdehbrvbdensdvfgreyhsdgrftyhedggrfdhsgfv

Non - Metals:

Some terms:

★ Malleable: This means that metals can be beaten into thin sheets with hammer.

★ Ductile: This means that metals can be drawn into thin wires.

★ Brittle: This means that non-metal break into pieces on hammering.

★ Sonorous: This means capable of producing a ringing sound.

Explanation:

Hole. Hole. Different notes can be played on the flute by blocking holes. ...

Drum skin. Drum skin. Hitting the bongo drum makes its tight elastic skin vibrate.

String. String. ...

Sound. hole. ...

Bow. Bow.

When a force is applied to an object resting on a surface, the frictional force acts in the opposite direction to the force applied. There are two types of frictional forces: static friction and kinetic friction.

Static friction is the force that opposes the start of motion between two surfaces, while kinetic friction is the force that opposes the motion of an object that is already moving.The coefficient of friction is a dimensionless constant that describes the relationship between the frictional force and the normal force, which is the force perpendicular to the surface. It can be used to calculate the frictional force in a given situation.

To find the coefficient of static friction, we use the formula:

fs = μsN

where fs is the force of static friction, μs is the coefficient of static friction, and N is the normal force acting on the box. Since the box is on a horizontal surface, the normal force is equal to the weight of the box, which is given by:

N = mg

where m is the mass of the box and g is the acceleration due to gravity (9.81 m/s^2). Substituting in the given values, we get:

N = (3.0 kg)(9.81 m/s^2) = 29.43 N

To find the coefficient of static friction, we need to determine the minimum force required to start the box moving. Since the force required is given as 37.0 N.

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Answer:

Standing in a moving bus may lead the person fall when the driver will apply brake.

Explanation:

According to Newton's third law of motion, there is an equal and opposite reaction to every action. When the bus is moving, the person standing is in the state of rest. The moment the driver applies brake, the bus stops. The stopping of the bus makes the person in the stationary position change in motion. Because of this force, the person may fall and collide if he is standing instead of sitting in the moving bus.

The kinetic energy of the spring is obtained as 12 J. Option C

We know that the kinetic energy is the energy that is required to stretch the spring. We can use the graph that has been shown to show the force constant of the spring.

We can find the force constant as the slope of the graph as follows;

K = \(y_{2} - y_{1} /x_{2} - x_{1}\)

K = 60 - 0/0.3 - 0.2

K = 60/0.1

K = 600 N/m

We then have;

W = KE = 1/2 Kx^2

Thus;

KE = 0.5 * 600 * (20 * 10^-2)^2

KE = 12 J

It would have a kinetic energy of 12 J.

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Answer:

V = m / s           correct units for V

x = V * t = m / s * s = m    where x is in meters

Thus t = x / V = m / (m / s) = sec

A) has to be the correct equation

Answer: 69

Explanation: 160 divided by 2 is 69

The potential drop increases as more cells are connected in series form.

In series circuit connection, the current across the cells is the same but the voltage varies.

When a circuit is connected to a single cell, the potential drop is given as;

\(V = Ir\)

where;

V is the potential drop

I is the current

r is the resistance

However, when two cells are connected in a row or serially, the total voltage drop is given as;

\(V = Ir_1 + Ir_2\\\\V = I (r_1 + r_2)\)

Thus, potential drop increases as more cells are connected in series form. The electricity in our homes and factories are connected in parallel form to reduce this voltage drop.

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Let us find first the forces at 1, 2 & 3 points.

We know that ke= 8.99 * 109N.m2 / C2

The forces are: -

F1 = keq1q2 / r212 = {8.99 * 109N.m2 / C2} * {10 * 10-6 C} * {40 * 10-6 C} / {10 * 10-2 m}2

F1 = 359.6 N

F2 =keq1q3 / r213 = {8.99 * 109N.m2 / C2} * {10 * 10-6 C} * {30 * 10-6 C} / {30 * 10-2 m}2

F2 = 29.96 N

F3 = keq2q3 / r213 = {8.99 * 109N.m2 / C2} * {40 * 10-6 C} * {30 * 10-6 C} / {20 * 10-2 m}2

F3 = 269.7 N

Now,

The net force on q1 is F1 – F2,

i.e. F1 + F2 = 359.6 + 29.96

F(q1) = 389.56 N to the left

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It is possible that the issue lies with the screen or the battery of your Galaxy A03s.

Even though you can hear the device working, it may not be able to power on due to a malfunctioning screen or a drained battery. When you plug it into the computer, it may show up because the device is still receiving power through the USB port. Try charging your phone for a few hours or try replacing the battery. If that doesn't work, you may need to take it to a repair shop to diagnose and fix the issue.

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Answer:

--->The goals of the investigators is to prevent tampering with evidence and reduce exposing workers to additional harm.

--> The investigators are able to find out how fast a car that was involved in an accident was going by measuring the length of skid marks.

Explanation:

Automobile or car accidents are incidents which when it occurs are generally fast, violent and confusing to both the people involved and the eyewitnesses. With the development in technology, investigators (usually known as forensic investigators) use a variety of tools and physical evidence to put together a clear picture of what happened during a car accident. With their discoveries, they would be able to to prevent tampering with evidence and reduce exposing workers to additional harm.

They can know how fast a car that was involved in an accident was going by:

--> Analysing a physical evidence such as measurement of the length of skid marks. When the skid distance (which is the drag factor due to road surface friction) and the braking efficiency are determined, the minimum speed of a car as it started skidding can be estimated. Even the appearance of the skid mark also tells investigators whether a car was braking, accelerating, or sliding.

When an engineering team reaches the stage of iterating to improve the solution in the engineering design process, there are various activities that the team might be doing. One of the most crucial activities at this stage of the design process is testing. Here are a few things that an engineering team might do to test and improve the solution:

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To find the spherical convex mirror radius, learn the focal length and magnitude.

What is focal length?

The focal length of a thin lens in air is measured from the lens's center to its primary foci, also known as focal points. The focal length of a converging lens, such as a convex lens, is positive and determines how far a collimated light beam must travel to focus on a single point.

What is magnitude?

Magnitude typically refers to size or distance. By comparing the size and motion speed of the object, we can relate magnitude to movement. The object's or quantity's size determines its magnitude.

R=0.123m

Focal length E= R/2

E= - 0.0615m.

Therefore, the focal length is 0.0615m.

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The amount of energy needed to raise the temperature of 1 gram of a substance by 1 degree Celsius

Given

The electric flux is

Radius of the sphere,

To find

a. The flux through a gaussian sphere with radius of 29.0 cm.

b. The magnitude of the charge

Explanation

a. Since the gaussian sphere covers the same charge so the electric flux through both the sphere will be same.

Thus the required flux is

b.

The magnitude of the charge is

Conclusion

a. The flux is

b. The charge is

If a batter hits a baseball with an exit velocity of 50 m/s at a launch angle of 40 degrees if the fence is 175 meters from the batter, Yes he would be able to hit a home run.

It can be defined as the motion of any object or body when thrown from the earth's surface and follows any curved path under the effect of the gravitational force of the earth.

As given in the problem, a batter hits a baseball with an exit velocity of 50 m/s at a launch angle of 40 degrees if the fence is 175 meters from the batter

The horizontal distance covered by the ball = u²sin2θ / g

                                                                        = 50²×sin80 / 9.81

                                                                        =250.97 meters

Thus, the horizontal distance covered by the baseball would be greater than 175 meters, therefore he would be able to hit the home run.

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Aerobic exercise helps you lose weight and keep it off when combined with a good diet.

When you first begin regular aerobic exercise, you could feel exhausted. But over time, you'll benefit from more endurance and less weariness.

Over time, you can also improve your bone and muscle strength as well as your heart and lung health.

Regular aerobic exercise like walking, cycling, or swimming can improve your health and length of life.

You repeatedly contract your arms, legs, and hip muscles when engaging in aerobic exercise. You'll become aware of your body's reactions immediately.

You'll deepen and speed up your breathing. The amount of oxygen in your blood is increased as a result. As a result of your heart beating more quickly, more blood will reach your muscles and return to your lungs.

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Generally, the coefficient of static friction should be at least 0.7 for a car traveling at this speed, but this value could be higher depending on the specific conditions.

The coefficient of static friction, or μs, is the ratio of the maximum static force that can be applied without causing slipping to the normal force between two surfaces. The coefficient is affected by the surfaces in contact and the material they are made of.

The tires of a car also have an effect on the coefficient of static friction. Tires with a greater tread depth can provide better grip on the road and therefore have a higher coefficient of static friction than tires with a shallow tread. Tire pressure also plays a role, as low pressure can reduce the coefficient of static friction.

The weight of the vehicle is also an important factor. Heavier vehicles tend to have a higher coefficient of static friction, as the greater mass increases the normal force between the car and the surface.

In conclusion, the coefficient of static friction for a car traveling at 115 km/h around a turn depends on several factors, including the road surface, the vehicle's tires, and the vehicle's weight.

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Answer:

Meditation and Positive Thinking

Explanation:

Answer:

Explanation:

the aversge is 3.4t

To determine how much solar power would need to grow to match the current level of hydroelectric power, we would need to compare the respective capacities or generation outputs of these two energy sources.

As of my knowledge cutoff in September 2021, hydroelectric power is one of the largest renewable energy sources globally, accounting for a significant portion of electricity generation. According to the International Energy Agency (IEA), hydroelectric power accounted for around 16% of global electricity generation in 2019. To match the current level of hydroelectric power generation with solar power, we would need to consider the growth of solar capacity or generation to reach a similar level. However, the exact growth required would depend on several factors, including the specific capacity factors (ratio of actual energy generated to the maximum possible) and potential for solar power in different regions.

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Answer: a= ff+fh/m

Explanation: bc khan academy said it was d. a=ff +fh/m

Answer:

answer is

m= Ff-Fh/a

If the height of the saline solution is decreased to 1.50 m, the flow rate will remain unchanged.

To verify the pressure created at a depth of 1.61 m in a saline solution, we can use the hydrostatic pressure formula:

P = ρ × g × h,

where P is the pressure, ρ is the density of the saline solution, g is the acceleration due to gravity, and h is the height or depth.

Given:

Depth (h) = 1.61 m

Density of saline solution (ρ) = density of seawater ≈ 1025 kg/m³

Acceleration due to gravity (g) ≈ 9.8 m/s²

Substituting these values into the formula, we can calculate the pressure:

P = (1025 kg/m³) × (9.8 m/s²) × (1.61 m).

Calculating this expression, we find:

P ≈ 1.62 × 10⁴ N/m².

Therefore, the pressure created at a depth of 1.61 m in the saline solution is approximately 1.62 × 10⁴ N/m².

To calculate the new flow rate if the height of the saline solution is decreased to 1.50 m, we need to consider the relationship between the flow rate and the height of the liquid column.

The flow rate (Q) is given by:

Q = A×v,

where Q is the flow rate, A is the cross-sectional area of the tube, and v is the velocity of the fluid.

Given that the cross-sectional area of the tube remains constant, we can assume that it does not affect the flow rate. Therefore, we can focus on the change in velocity due to the change in height.

Using Bernoulli's equation, we can relate the velocity of the fluid to the height of the liquid column:

P + 0.5 × ρ × v² + ρ×g×h = constant,

where P is the pressure, ρ is the density of the fluid, v is the velocity, g is the acceleration due to gravity, and h is the height.

Since we are considering a steady flow with negligible changes in velocity, we can assume that the pressure term dominates. Therefore, we can simplify the equation to:

P + ρ ×g × h = constant.

We can rewrite this equation as:

P = constant - ρ × g×h.

Let's denote the initial pressure as P₁ and the final pressure as P₂. We can set up the equation:

P₁ = constant - ρ × g × h₁,

P₂ = constant - ρ × g × h₂.

Since the constant term is the same in both equations, we can equate the two equations:

P₁ = P₂.

constant - ρ × g× h₁ = constant - ρ × g × h₂.

We can cancel out the constant terms and rearrange the equation:

ρ × g × h₁ = ρ × g × h₂.

Since the density and acceleration due to gravity are constants, we can simplify the equation further:

h₁ = h₂.

This means that the height change does not affect the pressure or flow rate. Therefore, the new flow rate remains the same as the initial flow rate.

Hence, if the height of the saline solution is decreased to 1.50 m, the flow rate will remain unchanged.

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The reason why there is not a solar eclipse at every new Moon is because the orbital plane of the Moon is tilted by about 5° to the ecliptic plane. The correct answer is option b.

This is the reason why there is not a solar eclipse at every new Moon. The ecliptic plane is the plane of Earth's orbit around the sun. For a solar eclipse to occur, the Moon must be in the same plane as the Sun and Earth, but because the Moon's orbital plane is tilted by about 5° to the ecliptic, it often misses alignment and a solar eclipse does not occur.

A solar eclipse is a phenomenon that occurs when the Moon passes between the Sun and Earth, casting a shadow on Earth and blocking the light from the Sun. There are three types of solar eclipses: total, partial, and annular. During a total solar eclipse, the Moon covers the entire disk of the Sun, causing the sky to darken and creating a spectacular sight.

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To determine the distance from the fence post where Tony the Turtle started, we can utilize the formula for constant acceleration: Δx = vi * t + (1/2) * a * t^2.

Tony takes 10.0 seconds to reach a pine tree located 10.0 meters further down the path, and his velocity when passing the tree is 1.2 m/s.

Initially, we need to find Tony's acceleration by employing the equation vf^2 = vi^2 + 2ad. By substituting the given values, we obtain 1.44 = vi^2 + 20a.

Additionally, Tony covers the 10-meter distance from the fence post to the tree in 10.0 seconds, as indicated by the distance formula for constant acceleration: Δx = vi * t + (1/2) * a * t^2.

Inserting the known values, we have 10 = 10vi + 50a. We now have two equations with two unknowns: vi and a. Solving for vi in the second equation yields vi + 5a = 1.

Substituting this expression for vi into the first equation, we obtain 1.44 = vi^2 + 10vi a + 26a^2. Simplifying this equation results in 51a^2 - 14a + 0.44 = 0.

Applying the quadratic formula, we find two possible values for a: 0.20 or 0.016. Since Tony is accelerating, we select the positive value, a = 0.20 m/s^2.

By using the second equation, we can solve for vi: 10 = 10vi + 50(0.20), which yields vi = -4 m/s. Tony's negative initial velocity implies he was moving backward when he began.

This aligns with the fact that he needed 10 seconds to accelerate to a relatively slow speed of 1.2 m/s. To calculate the distance from the fence post when Tony started, we can once again apply the formula for constant acceleration: Δx = vi * t + (1/2) * a * t^2.

Substituting the known values, we find Δx = (-4)(10) + (1/2)(0.20)(10)^2, resulting in Δx = -40 + 10, which equals -30. Therefore, Tony was 30 meters from the fence post when he commenced his journey.

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The focal length of an objective lens is directly related to its magnification power. The shorter the focal length, the higher the magnification. In this case, Lens D has a focal length of 17mm, which is the shortest among the four lenses provided. Therefore, Lens D would provide the highest magnification among the four lenses.

However, it is important to note that magnification alone is not the only factor to consider when choosing an objective lens. Other factors such as the numerical aperture, working distance, and resolution should also be taken into account. It is important to choose the right combination of factors for the specific application at hand.

In summary, Lens D would provide the highest magnification among the four lenses provided due to its short focal length of 17mm. But it is important to consider other factors in addition to magnification when selecting an objective lens for a specific application.

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