A car is being lifted by a crane so that it moves upwards at a constant speed. A50%Part (a) Which force is doing negative work on the car as it is being lifted? The force of gravity on the car due to the Earth. The force of the car acting on the rope. There is no work being done because the kinetic energy of the car is constant. The force of the rope acting on the car. (7\%) Problem 1: A car is being lifted by a crane so that it moves upwards at a constant speed. a.50%Part (a) Which force is doing negative work on the car as it is being lifted? A 50%Part (b) Which force is doing posirive work on the car as it is being lifted? The force of the rope acting on the car. The force of the car acting on the rope. There is no work being done because the kinetic energy of the car is constant. The force of the Earth acting on the car.

Explanation:

the speed of the dog was 400

The angular frequency of the glider that takes 0.30 s to travel the distance of 12 cm from one turning point to another is 20.93 rad/s.

The angular frequency is the magnitude of the angle of the sector of the circle formed by the trajectory of the point that moves in a circle per unit time. Briefly, angular speed is the angular speed accompanied by the direction. The unit of angular speed is rad/second or rad/minute or rad/hour, depending on what is known from each problem.

The equation for determining the angular speed or angular frequency is:

ω= 2\(\pi\)/T or ω = 2\(\pi\)f

Where f = 1/T

ω = angular speed or frequency (rad/second)

\(\pi\) = 3.14

f = frequency (rev/second)

T = period (second)

We have,

T = 0.30 s

So, ω = 2\(\pi\)/T

= 2 (3.14) / 0.30

= 20.93 rad/s

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The battery's negative and positive terminals have a 6J/C potential difference. This depicts a separation between a positive charge and a negative charge.

Calculation:

W = qV

W/q = V

42/7 = V

V = 6J/C

For every 1 Coulomb of charge that passes between a 12 volt battery's negative and positive terminals, 12 Joules of electric potential energy are produced. Charge to potential energy change changes in a 12:1 ratio. The difference in potential energy for two Coulombs of charge would therefore be 24 Joules.

The cell is charged by current I that comes from another source. In this situation, the terminal potential difference is Ir times bigger than the emf, hence V=E+Ir.

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The difference in power for two people carrying the boxes up the ramp is 30 W.

Given the following data:

W = 40.0 N is the weight of a box.

The ramp's length is L = 2.00 m.

The platform height is h = 1.0 m.

t = 2.0 s is the time interval for the first person.

t' = 4.0 s is the time interval for the other person.

Power is the rate at which energy is used. The expression for the Power is given in the given question as,

P = W×(L+h)/t

Assume that you are solving for the first person.

P₁ = W(L+h)/t₁.................................................................. (1)

Substitute the following values into equation (1):

P₁ = 40(2+1)/2

P₁ = 20(3) (3)

P₁ = 60 W.

Regarding the second person,

P₂ = W(L+h)/t₂..................................................................... (2)

Fill in the blanks in equation (2) as follows:

P₂ = 40(2+1)/4

P₂ = 10*(3) *3)

P₂ = 30 W

Obtaining the difference in power as

P = P₁ - P₂

P = 60-30

P = 30 W

As a result, we can conclude that the difference in power for two people carrying the boxes up the ramp is 30 W.

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To calculate the book value at year 3 (BV3), we need to determine the accumulated depreciation at year 3. The depreciation is calculated by subtracting the salvage value from the initial cost and dividing it by the number of years.

Initial cost: $20,000

Salvage value: $5,000

Number of years: 5

Depreciation per year = (Initial cost - Salvage value) / Number of years

Depreciation per year = ($20,000 - $5,000) / 5 = $3,000

Accumulated depreciation at year 3 = Depreciation per year * Number of years

Accumulated depreciation at year 3 = $3,000 * 3 = $9,000

Book value at year 3 = Initial cost - Accumulated depreciation at year 3

Book value at year 3 = $20,000 - $9,000 = $11,000

Therefore, the Book Value at year 3 (BV3) is $11,000 (option d).

To calculate the depreciation at year 3 (D3), we can simply use the depreciation per year, which is $3,000. Therefore, the Depreciation at year 3 (D3) is $3,000 (option b).

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The temperature to which the gas would have to be changed if a 3.50 L sample at 23.0°C were to have a final volume of 1.50 L is 127 K.

According to Charles's law, when a fixed amount of gas is held at constant pressure, the volume of the gas is directly proportional to the temperature. This means that the temperature of the gas would have to be changed to adjust its volume. The relation can be expressed as follows:

V1/T1 = V2/T2

where

V1 is the initial volume of gas

T1 is the initial temperature of gas

V2 is the final volume of gas

T2 is the final temperature of gas

In the given scenario, the initial volume of the gas is V1 = 3.50 L.

The initial temperature of gas is T1 = 23.0 °C = 23.0 + 273 = 296 K.

The final volume of gas is V2 = 1.50 L.

The formula for Charles's law is

V1/T1 = V2/T2

Rearranging the equation, we can find the final temperature as follows:

T2 = (V2/V1) × T1

T2 = (1.50/3.50) × 296K = 127 K

Thus, the final temperature of gas would have to be changed to 127 K to have a 3.50 L sample at 23.0 °C with a final volume of 1.50 L.

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First, draw a diagram to visualize the situation:

The average velocity v is defined as the quotient of the total displacement over the time that it takes to perform the displacement:

Notice that both velocity and displacement are vector quantities.

For that reason, the direction of the average velocity will be the same as the direion of the displacement.

Find the displacement by adding the three displacements as vectors. To do so, find the x and y components of each displacement, add the components to find the x and y components of the total displacement, and finally use the vertical and horizontal components of the total displacement to find the direction.

9.90 km East:

Since this vector points towards the East, its vertical component is 0.

The horizontal component is 9.90 km.

9.00 km 15.0º East of North

Since the angle of 15.0º is measured with respect to the positive Y axis, use the cosine function to find the vertical component and the sine function to find the horizontal component.

Vertical component:

Horizontal component:

9.90 km East:

Since this vector points towards the East, its vertical component is 0.

The horizontal component is 9.90 km.

Vertical component of the displacement:

Horizontal component of the displacement:

To find the direction in degrees north of east, notice that:

Then:

The magnitude of a vector V with components V_x and V_y is:

Then, the magnitude of the displacement is:

Divide the magnitude of the displacement by the total travel time to find the magnitude of the average velocity. The total time was 0.5h+0.77h+0.5h=1.77h.

Therefore, the answers are:

R=10+15+30

55 is the answer to the question

Answer:

your answer should be c

Answer:

D.the branch that deals with the relations of organisms to one another and to their physical surroundings

The velocity of the two-block system at the top of the ramp is half the initial velocity of the second block. However, the force due to gravity exerted on both blocks as they travel up the ramp is not relevant to the conservation of momentum because it is a conservative force that does not affect the total momentum of the system.

The total momentum of the system before the collision is equal to the momentum of the second block, which is given by:

p = mv0

where m is the mass of each block, and v0 is the initial velocity of the second block.

After the collision, the two blocks move together with an unknown velocity vr. The total momentum of the system after the collision is:

p' = (2m)vr

where 2m is the total mass of the two blocks, and vr is the final velocity of the system.

The conservation of momentum states that the total momentum of an isolated system remains constant, provided no external forces act on it. Therefore, the total momentum of the system before the collision is equal to the total momentum of the system after the collision:

p = p'

Substituting the expressions for p and p' gives:

mv0 = (2m)vr

Simplifying gives:

vr = v0/2

The velocity of the system can be measured to confirm that the conservation of momentum applies to the system.

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Answer:

How is high-speed internet typically transmitted around the world? over telephone wires b. through fiber optic cables c. beamed wirelessly to homes d via satellites​

Explanation:

Answer:

option A

Explanation:

wave speed= 650×35= 22750 m/s

hope it helps !

Answer:

option is the correct answer mark me as a brain list pls

Answer:

The slit width a, must be equal to the wavelength λ

That is, every point on one side of the slit must have a corresponding point that is 180 degrees out of phase on the other side of the slit so the corresponding point on the screen receives no light,

This condition is also known as the Rayleigh criterion for the first dark fringe. It gives the angle at which the first dark fringe will appear in the diffraction pattern for a given wavelength of light and slit width.

When light waves pass through a single slit of width w, they diffract and create a diffraction pattern on a screen placed behind the slit. The pattern consists of a central bright fringe flanked by a series of alternating bright and dark fringes. The condition for the first dark fringe can be determined using the following formula:

sin θ = λ/w

where θ is the angle between the line normal to the slit and the direction of the dark fringe, λ is the wavelength of the light, and w is the width of the slit.

For the first dark fringe, the angle θ is equal to the smallest angle for which the path difference between the waves from the top and bottom edges of the slit is λ/2. This means that the condition for the first dark fringe is:

sin θ = λ/2w

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Answer:

I'm not sure it is c I'm sure it is d

Answer:

I think it may be either A. or C.

Explanation:

A factor which has the most significant influence on a liquid's surface tension is: D. The strength of the electric forces between its molecules.

Surface tension is a property of liquid such as water, which makes its surface to resist an external force due to the cohesive nature of the liquid's molecules.

Hence, the surface tension of a liquid is highly dependent on the electric (cohesive) forces of attraction existing between its molecules.

Additionally, the surface tension of a liquid is an inward force which tends to minimize its surface area rather than maximizing its surface area.

In conclusion, the strength of the electric (cohesive) forces of attraction between a liquid's molecules has the most significant influence on a liquid's surface tension.

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When you change the thickness of the wire in a circuit, option B. the resistance (R) and current (I) will also change, but the voltage (V) will remain constant.

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area (thickness). As the thickness of the wire changes, the cross-sectional area changes, which in turn affects the resistance. Thicker wires have a larger cross-sectional area, resulting in lower resistance, while thinner wires have a smaller cross-sectional area, resulting in higher resistance. Therefore, changing the thickness of the wire will cause a change in resistance.

According to Ohm's Law (V = IR), the voltage (V) in a circuit is equal to the product of the current (I) and the resistance (R). If the voltage is kept constant, and the resistance changes due to the thickness of the wire, the current will also change to maintain the relationship defined by Ohm's Law. When the resistance increases, the current decreases, and vice versa.

However, it's important to note that changing the thickness of the wire will not directly affect the voltage. The voltage in a circuit is determined by the power source or the potential difference applied across the circuit and is independent of the wire thickness. As long as the voltage source remains constant, the voltage across the circuit will remain constant regardless of the wire thickness. Therefore, the correct answer is option B.

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a) y(t) = te⁻³ᵗ is a possible position function.

b) General equation: y(t) = C₁e^(-2t) + C₂e^(-3t) + t(e^(-3t))(At + B).

c) Exact motion equation: y(t) = (23/5)e^(-2t) - (8/5)e^(-3t) + t(e^(-3t))(At + B), with initial conditions y(0) = 3 and v(0) = -7.

a) To show that y(t) = te⁻³ᵗ is a possible position function, we substitute it into the differential equation:

y(t) = te⁻³ᵗ

y'(t) = e⁻³ᵗ - 3te⁻³ᵗ

y''(t) = -6e⁻³ᵗ + 9te⁻³ᵗ

Substituting these expressions into the differential equation, we have:

-6e⁻³ᵗ + 9te⁻³ᵗ + 7(e⁻³ᵗ - 3te⁻³ᵗ) + 6(te⁻³ᵗ) = -6te⁻³ᵗ - e³ᵗ

Simplifying this equation, we find that both sides are equal, thus confirming that y(t) = te⁻³ᵗ is a possible position function.

b) The general equation for all possible position functions can be written as:

y(t) = C₁e^(-2t) + C₂e^(-3t) + t(e^(-3t))(At + B)

c) Given the initial conditions y(0) = 3 and y'(0) = v(0) = -7, we substitute these values into the general equation and solve for the constants:

3 = C₁ + C₂

-7 = -2C₁ - 3C₂

Solving these equations, we find C₁ = 23/5 and C₂ = -8/5.

The exact motion equation for the weight is:

y(t) = (23/5)e⁻²ᵗ - (8/5)e⁻³ᵗ + t(e⁻³ᵗ)(At + B)

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Suppose a weight of 1 kg is attached to an oscillating spring with friction constant b = 7 and stiffness constant k = 6. Suppose the external forces on the weight are: Fₑₓₜ(t) = - 6te⁻³ᵗ - e³ᵗ

y" + 7y' + 6y = - 6te⁻³ᵗ - e³ᵗ

a) Show y(t) = te⁻³ᵗ is a possible position function for this weight.

b) Find a general equation for all possible position functions.

c) Find the exact motion equation for this weight if its initial position is y(0) = 3, and its initial velocity is v(0) = y'(0) = -7.

Answer:

Divide by the number 100

Explanation:

Since there are 100 centimeters in 1 meter, we can see that if you are given a number in centimeters, the number of meters is that number divided by 100. Hope this helps!

Answer:

Divide by 100

Explanation:

The actual question should be did the sound waves escape room?

Yes they can escape the room

Health literacy is knowing about health and knowledge of of right healthcare and services, taking care of diseases or just knowledge or taking care of your own health.

Answer:

z3

Explanation:

When Earth is closer to the sun, there will be hotter climate. A little movement that takes one closer to the sun could lead to a huge impact.

If I put a planet in orbits 2, 6, and 75, all planets will orbit the sun successfully if the sun's mass is 1x, and at least one planet will fall inside the habitable zone.

If I put a planet in orbits 84, 1, and 5, at least one of them will fall into the habitable zone if the sun's mass is 2x, and all planets will orbit the sun successfully.

If I put a planet in orbits 672 and 7, at least one of them will fall into the habitable zone if the sun's mass is 3x, and all planets will orbit the sun successfully.

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3,970.8

Explanation:

v=661.8×6

3,970.8

Answer:

the activity in this is not an easy way to do it in my mind and the heart of the city is not a bad day to get to a new report from the University of Texas I think that it was not until you are looking for a way that it would have been a great job in the world and is not intended to limit the scope of this invention to provide a method and system and a lot of people are going to get.

Answer:

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.

The 28-cm-diameter disk in (figure 1) can rotate on an axle through its center clockwise with net torque 0.7 Nm.

Given from figure is ,

D = 28 cm = 0.28 m

r = D/2 = 0.14 m

θ = 45°

F₁ = 30N

F₂ = 20N

F₃ = 30N

To calculate net torque,

∴ τ = -(F₁ × r) + (F₂ × r/2) + (F₃ × r/2 )(sin 45°)

∴ τ = -(3 0 × 0.14) + (20 × 0.07) + (30 × 0.07 × 0.707)
∴ τ = -(4.2) + (1.4) + (2.1)

∴ τ = -0.7 Nm

The net torque about the axle will be -0.7 Nm and the negative sign indicates that it is clockwise .

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Photovoltaic cells are the best way to generate renewable energy and meet electrical needs. However, in practice, many factors limit their efficiency. These factors include darkness, various weather conditions, maintenance, and the angle of the Sun. Each photovoltaic cell can produce up to 15% efficiency.

Hence to meet the electrical needs of a cabin, it is essential to calculate the number of photovoltaic cells required.The efficiency of each photovoltaic cell is 15%. Therefore, 100/15 = 6.66 solar panels would be required to meet the electrical needs of the cabin. However, this is an estimated value and depends on various factors such as the cabin's location, power consumption, weather conditions, etc.

To accurately determine the number of photovoltaic cells required, it is essential to perform an energy audit of the cabin. An energy audit helps determine the cabin's energy consumption and identifies energy-saving opportunities. The energy audit also considers the cabin's location and weather conditions, which helps to accurately determine the number of photovoltaic cells required.

In conclusion, if the photovoltaic cells operate at 15% efficiency, 6.66 solar panels would be required to meet the electrical needs of the cabin. However, to determine the accurate number of photovoltaic cells required, an energy audit is necessary. The audit considers the cabin's energy consumption, location, and weather conditions, which helps to accurately calculate the number of photovoltaic cells required.

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The period of the pendulum is √2 seconds.

We need to know about pendulum experiments to solve this problem. The pendulum is a simple experiment to calculate gravitational acceleration. The gravitational acceleration can be calculated by

g = 4π² . L / T²

where g is gravitational acceleration, L is the length of the string and T is the period.

From the question above, we know that:

T1 = 1 s

L1 = 5 cm

L2 = 10 cm

By using proportionality, the squared period is proportional to the length. Hence,

T² ~ L

Using the ratio, we can write

T1² / T2² = L1 / L2

1² / T2² = 5 / 10

1 / T2² = 1 / 2

T2² = 2

T2 = √2 second

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According to the solving the percentage of voltage drop is 2.8%

Let V = Source voltage

= 277 volts

Let R = Total line resistance of the circuit conductors

= 0.5 Ω

Let A = Each row drawing

= 12.5 amperes

Let k = 12.6

The voltage drop formula is given by:

Vdrop = kRA

Where; Vdrop = Voltage drop

= Constant of the wire

= Total line resistance

A = Load Current

Putting the given values in the voltage drop formula, we get;

Vdrop = 12.6 x 0.5 Ω x (12.5 + 12.5) amps

Vdrop = 12.6 x 0.5 Ω x 25 amps

Vdrop = 7.875 volts

Percentage of Voltage drop = (Vdrop / V) x 100%= (7.875 / 277) x 100%

Percentage of Voltage drop = 2.8427 % ≈ 2.8%

Therefore, the percentage of voltage drop is 2.8%.

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