A student wants to use a ramp to move boxes into a truck bed that is 3 m high. He has a choice of 2 different ramps. The length of one ramp is 2m, and the length of the other ramp is 8m. Which one will make his work easier? A. 8m, because he has to apply more force over a greater distance. B. 8m, because he has to apply less force over a greater distance. C. 2m, because he has to apply less force over a greater distance. D. 2m, because he has to apply more force over a greater distance

A conservative force is a force that conserves energy. This means that the work done by the force on an object is independent of the path taken by the object.

In other words, if the object moves from one point to another, the work done by the conservative force is the same regardless of the path taken. This is because the work done by a conservative force depends only on the initial and final positions of the object and not on the path taken. Examples of conservative forces include gravitational forces and electromagnetic forces. These forces are also Non dissipative, which means that they do not cause a loss of energy from the system, and they maintain equilibrium, which means that they keep the system in a stable state.

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Answer: Moisture and food (bread)

Explanation:

Mould grows best in humid, damp air/wet conditions.

Since the bread is moist it will provide humidity for the mould as well as food.

A container with a cover would not be a favoring condition as mould needs oxygen to grow and survive.

The maximum height travelled by the ball before returning to the ground is 8.62 m.

The maximum height travelled by the ball before returning to the ground is calculated by applying the following kinematic equation as shown below.

H = (u²sin²θ) / 2g

where;

H = (26² (sin 30)²) / (2 x 9.8)

H = 8.62 m

Thus, the maximum height travelled by a projectile depends on the initial velocity and angle of projection.

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Answer:

the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the source of the wave. When the observer is moving towards the source, the waves are compressed and the frequency increases (called a blue shift). Conversely, when the observer is moving away from the source, the waves are stretched and the frequency decreases (called a red shift). This phenomenon can be observed in sound waves, light waves, and other types of waves.

Answer: an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other

Explanation:

When you push a pencil off your desk, the energy transformation that takes place is that potential energy transforms into kinetic energy.

The correct answer to the given question is option C.

Potential energy is the energy stored within an object because of its position or configuration.

In this scenario, the pencil has potential energy because of its elevated position on the desk. When the pencil is pushed off the desk, it begins to move, which means that it has kinetic energy. Kinetic energy is the energy of motion.

As the pencil falls off the desk, its potential energy is transformed into kinetic energy, which is the energy that results from its motion. The faster the pencil falls, the greater its kinetic energy will be because kinetic energy is directly proportional to the square of an object's velocity.

Therefore, when you push a pencil off your desk, the potential energy that it has because of its elevated position is transformed into kinetic energy as it falls towards the ground.

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According to the information given, you weigh 741 N on Earth where the acceleration due to gravity (g) is 9.80 m/s^2. On the surface of another planet, you weigh 5320 N. To find the acceleration due to gravity on that planet, we can use the formula:

Weight = mass * acceleration due to gravity
Let's solve this step by step:
Step 1: Find the mass on Earth
Weight = mass * g
741 N = mass * 9.80 m/s^2
Divide both sides of the equation by 9.80 m/s^2:
mass = 741 N / 9.80 m/s^2
Step 2: Find the acceleration due to gravity on the other planet
Weight = mass * acceleration due to gravity
5320 N = mass * acceleration due to gravity

Substitute the mass value we found in Step 1:
5320 N = (741 N / 9.80 m/s^2) * acceleration due to gravity
Multiply both sides of the equation by 9.80 m/s^2:
acceleration due to gravity = (5320 N * 9.80 m/s^2) / 741 N
Now, calculate the acceleration due to gravity using the given values.

Conclusion:
The acceleration due to gravity on the other planet is the result of the above calculation. Make sure to perform the calculation accurately to obtain the correct value.

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The distance is 9.65 m.

Area of each triangular sector = 338/5

Angle subtended at center = 360° / 5 = 72°

Let, circumradius of pentagon = r

Side of pentagon = 2r sin36°

Apothem = rcos36°

Area of each sector = 1/2 (2r sin 36°)(rcos36°)

= \(r^{2}\)/2 sin72° = 338/5

\(r^{2}\) = 338/5 × 2/sin72° = 142.16

r = 11.9 m

Apothem = rcos36° = 9.65 m

Hence, the distance is 9.65 m.

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Answer:

y

Explanation:

i did it

The object in image [x] has a net force of -5 Newtons in the vertical direction.

In order to move a body of mass (m) with an acceleration of 'a' m/s², a force of magnitude equal to the product of body's mass and the required acceleration is needed. Mathematically -

F = ma

It is a vector quantity. In a three dimensional coordinate, the force vector can be resolved as -

[F] = F[x] a[x] + F[y] a[y] + F[z] a[z]

[F] = m {A[x] a[x] + A[y] a[y] + A[z] a[z]}

We have free - body diagrams as shown in the image.

If we observe image [x], we can easy calculate that -

The force along the horizontal F[h] = 15 - 15 = 0

The force along the vertical F[v] = 20 - 25 = - 5 Newtons

Therefore, the object in image [x] has a net force of -5 Newtons in the vertical direction.

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[Refer to the image attached for full question]

Answer: Thanks for the points!

Explanation:  The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensity of the wave. As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder.

Answer:

Amplitude

Explanation:

A.  Time taken for swing of a pendulum is 2.3 seconds per swing.

B. To find the time for one swing more accurately, the student can increase the number of swings, use a stopwatch with higher precision, minimize external disturbances, and repeat the experiment to calculate the average time.

The time taken for 20 swings of a pendulum is 46 seconds. To find the time for one swing, we need to divide the total time by the number of swings.

a. Time for one swing: 46 seconds / 20 swings = 2.3 seconds per swing.

To find the time for one swing more accurately, the student can employ the following techniques:

1. Increase the number of swings: By measuring the time for a larger number of swings, the student can reduce the impact of measurement errors and obtain a more precise average time. For example, measuring the time for 100 swings and then dividing by 100 would provide a more accurate estimate.

2. Use a stopwatch or timer with higher precision: Using a stopwatch or timer that provides more decimal places or higher precision can help capture smaller time intervals more accurately. This can reduce rounding errors and improve the accuracy of the measurement.

3. Minimize external disturbances: To ensure accurate timing, it is important to minimize external disturbances that may affect the pendulum's motion, such as air drafts or vibrations. Conducting the experiment in a controlled environment can help reduce these disturbances and enhance measurement accuracy.

4. Repeat the experiment: Performing the measurement multiple times and calculating the average time can help account for any inconsistencies or random errors in the measurements. This can lead to a more reliable and accurate estimate of the time for one swing.

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Answer:

\(\large \boxed{\text{761 kJ}}\)

Explanation:

You calculate the energy required to break all the bonds in the reactants.

Then you subtract the energy needed to break all the bonds in the products.

                        N₂  +   O₂   ⟶         2NO

                     N≡N  + O=O ⟶       2O-N=O

Bonds:         2N≡N   1O=O        2N-O + 2N=O

D/kJ·mol⁻¹:     941      495           201      607

\(\begin{array}{rcl}\Delta H & = & \sum{D_{\text{reactants}}} - \sum{D_{\text{products}}}\\& = & 2 \times 941 +1 \times 495 - (2 \times 201 + 2\times 607)\\&=& 2377 - 1616\\&=&\textbf{761 kJ}\\\end{array}\\\text{The enthalpy of reaction is $\large \boxed{\textbf{761 kJ}}$}.\)

1. To find the time when the body reaches the ground, we can use the vertical motion equation:

h = v₀y * t + (1/2) * g * t²

where:

h = height of the tower = 15m

v₀y = initial vertical velocity = v₀ * sin(θ) = 30m/s * sin(30°)

g = acceleration due to gravity = 9.8m/s²

t = time

Plugging in the values:

15 = (30 * sin(30°) * t) + (0.5 * 9.8 * t²)

Simplifying the equation:

15 = 15t * 0.5t² + 4.9t²

Combining like terms:

15 = 7.5t² + 4.9t²

Simplifying further:

15 = 12.4t²

Dividing both sides by 12.4:

t² = 15 / 12.4

Taking the square root of both sides:

t = √(15 / 12.4)

Calculating the value:

t ≈ 1.01 seconds

Therefore, the time it takes for the body to reach the ground is approximately 1.01 seconds.

2. To find the displacement vector, we need to calculate the horizontal and vertical components separately.

Horizontal component:

The horizontal displacement can be calculated using the formula:

x = v₀x * t

where:

v₀x = initial horizontal velocity = v₀ * cos(θ) = 30m/s * cos(30°)

t = time is taken to reach the ground (previously calculated as approximately 1.01 seconds)

Plugging in the values:

v₀x = 30m/s * cos(30°)

t = 1.01 seconds

Calculating the value:

v₀x ≈ 26.02 m/s

Vertical component:

The vertical displacement can be calculated using the formula:

y = v₀y * t + (1/2) * g * t²

where:

v₀y = initial vertical velocity = v₀ * sin(θ) = 30m/s * sin(30°)

g = acceleration due to gravity = 9.8m/s²

t = time is taken to reach the ground (previously calculated as approximately 1.01 seconds)

Plugging in the values:

v₀y = 30m/s * sin(30°)

t = 1.01 seconds

Calculating the value:

v₀y ≈ 15 m/s

Now we have the horizontal and vertical components of the displacement vector:

Horizontal component: x ≈ 26.02 m/s

Vertical component: y ≈ 15 m/s

Therefore, the displacement vector of the body is approximately (26.02 m/s, 15 m/s).

3. To find the angle when the body hits the ground, we can use the vertical and horizontal components of the velocity.

The horizontal component of the velocity, v₀x, can be calculated using the formula:

v₀x = v₀ * cos(θ)

where:

v₀ = initial velocity = 30m/s

θ = angle of projection = 30 degrees

Plugging in the values:

v₀x = 30m/s * cos(30°)

Calculating the value:

v₀x ≈ 26.02 m/s

The vertical component of the velocity, v₀y, can be calculated using the formula:

v₀y = v₀ * sin(θ)

where:

v₀ = initial velocity = 30m/s

θ = angle of projection = 30 degrees

Plugging in the values:

v₀y = 30m/s * sin(30°)

Calculating the value:

v₀y ≈ 15 m/s

Now, to find the angle when the body hits the ground, we can use the inverse tangent function:

θ = arctan(v₀y / v₀x)

Plugging in the values:

θ = arctan(15 m/s / 26.02 m/s)

Calculating the value:

θ ≈ 30.96 degrees

Therefore, the angle when the body hits the ground is approximately 30.96 degrees.

4. To find the maximum height, we can use the vertical motion equation:

h = v₀y² / (2 * g)

where:

h = maximum height

v₀y = initial vertical velocity = v₀ * sin(θ) = 30m/s * sin(30°)

g = acceleration due to gravity = 9.8m/s²

Plugging in the values:

h = (30 * sin(30°))² / (2 * 9.8)

Calculating the value:

h ≈ 27.55 meters

Therefore, the maximum height reached by the body is approximately 27.55 meters.

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Answer:

The sun and other stars consist of plasma. Plasma is also found naturally in lightning and the northern and southern lights. Human-made plasma is found in fluorescent lights, plasma TV screens, and plasma spheres

Explanation:

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Answer:

Release

Explanation:

The water is heated until

TimeTime when energy stored in the capacitor will be half of its initial value=7.3s

To find the time at which the energy stored in the capacitor will be half of its initial value, we can use the formula for the time constant (τ) of an RC circuit and the fact that energy is halved when the voltage across the capacitor is reduced to 1/√2 of its initial value.

The time constant (τ) of the RC circuit is given by τ = R * C, where R is the resistance and C is the capacitance.

τ = (1.3 * 10^6 Ω) * (8.1 * 10^-6 F) = 10.53 seconds

Now, we can use the formula for discharging a capacitor: V(t) = V_initial * e^(-t/τ)

We need to find the time (t) when V(t) = V_initial / √2. So:

V_initial / √2 = V_initial * e^(-t/10.53)

Divide both sides by V_initial:

1 / √2 = e^(-t/10.53)

Take the natural logarithm of both sides:

-ln(√2) = -t / 10.53

Now, solve for t:

t = 10.53 * ln(√2) ≈ 7.3 seconds

So, the energy stored in the capacitor will be half of its initial value at approximately 7.3 seconds.

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The image height on the detector will change by a factor of 2 if you change from a 50-mm-focal-length lens to a 100-mm-focal-length lens and refocus.

The magnification of a lens is given by the ratio of the image height to the object height. Since the object height remains the same, the change in magnification is solely determined by the change in focal length.

The magnification of a lens is given by the formula:

Magnification = - (image distance / object distance).

Since we are only interested in the ratio of image heights, we can ignore the negative sign.

For the 50-mm lens, the magnification is:

Magnification1 = 50 mm / object distance.

For the 100-mm lens, the magnification is:

Magnification2 = 100 mm / object distance.

Taking the ratio of the two magnifications:

Magnification2 / Magnification1 = (100 mm / object distance) / (50 mm / object distance) = 100 mm / 50 mm = 2.

Therefore, the image height on the detector changes by a factor of 2 when switching from a 50-mm-focal-length lens to a 100-mm-focal-length lens and refocusing.

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Answer:

1144.8

Explanation:

1 meter per second is equal to 3.6 kilometers per hour

The maximum value of the average normal stress in the links connecting (a) points b and d is 101.56MPa and (b) points c and e is -21.7MPa.

Stress refers to the measure of an external force acting over the cross-sectional area of an object and is given as units of force per area: N/m2 (SI) or lb/in2 (US). The SI units are commonly referred to as Pascals (Pa). There are two types of stress experienced by normal stress and shear stress. When a force acts perpendicular to the surface of an object, it exerts a normal stress while when a force acts parallel to the surface of an object, it exerts a shear stress. In order to determine the average normal stress in the links provided, consider the bar ABC as a free body as attached. The moment of a force is the product of the force and the distance from the axis of rotation. Hence,

∑Mc = 0 where Mc is the summation of moment at point C

(0.04)FBD – (0.025 + 0.04)(20x10^3) = 0

(0.04)FBD – 1.3x10^3 = 0

FBD = 32.5x10^3 N (Link BD is in tension)

∑MB = 0 where MB is the summation of moment at point B

-(0.04)FCE – (0.025)(20x10^3) = 0

-(0.04)FCE – 0.5x10^3 = 0

FCE = -12.5x10^3 N (Link CE is in compression)

Net area of one link in tension = (0.008)(0.036-0.016) = 160x10^-6 m^2

Hence for two parallel links A = 320x10^-6 m^2

Net area of one link in compression = (0.008)(0.036) = 288x10^-6 m^2

Hence for two parallel links A = 576x10^-6 m^2

a) σBD = FBD/A = 32.5x10^3/320x10^-6 = 101.56x10^6 = 101.56MPa

b) σCE = FCE/A = -12.5x10^3/576x10^-6 = -21.7x10^6 = -21.7MPa

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bending your arms

good luck bro

A particle with a charge of 5. 0 μc is placed at the corner of a cube. the total electric flux through all sides of the cube is  7.1 × \(10^4 Nm^2/C\).

Electric flux is a measurement of how many electric field lines are present at any given surface. It has a scalar value. Voltmeters are its SI unit. Gaussian Law It is known as a closed surface when the total flux linked inside it is equal to one zero times the total charge contained within it.

The electric flux is positive when electric lines emerge from a surface and negative when the same lines enter a surface.

Flux through any surface is given by;

                                        Φ\(= \frac{Q}{E}\)

Where, E = The magnitude of the electric field.

            Q = The charge of the particle.

If a corner atom is shared by eight neighboring such cubes, then one- eight part of the corner atom or particle contributes to each cube.

                            Φ \(= \frac{Q}{8E}\) = \(\frac{5 * 10^-^6}{8*8.5 * 10^-^1^2}\)

                                         = 7.1 × \(10^4 Nm^2/C\)

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0.56 A is the current of the secondary coil.

transformer is the device that transfer electric energy from one AC circuit to another.

we know that ;

I ∝ 1/n;

where I IS CURRENT and n is NUMBER OF TURNS.

(I) secondary = X A

(n) secondary = 100

(I)  primary  = 0.04 A

(n)  primary  = 1400

USING THIS-----> I ∝ 1/n;

=>

0.04 A/X A =100/1400

=>X=0.56 A

as the current in the transformer is inversely proportional to the number of turns so 0.56 A is the current in the secondary coil.

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Answer:

• All Of The Above

Hope it helps uh

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According to Charles' Law, the V/T = k, V1/T1=V2/T2, in case v1= 4.39, T1= 44C=317 K (being O C= 273 K) V2=3.78 L T2=?. Charles law, 4.39L/317K = 3.78L/T2. T2x=4.39L/317K = 3.78 L. T2= 3.78L/4.39/317k, T2=273K=0 C

Place the bucket into the larger container, fill it with water, then submerge the inflated balloon completely. After that, remove the bucket, pour the water from the larger container into the measuring container, and measure the volume of the water.

The basic formula for volume is length, breadth, and height, as opposed to length, width, and height for the area of a rectangular shape. The calculation is unaffected by how you refer to the various dimensions; for instance, you can use "depth" instead of "height."

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Answer:

B because Needs are things that are essential to life but wants are just extra.

Explanation:

For example food and water is needed for life but a want would be to have the latest I phone

A major difference between economic wants and economic needs is: B- Needs are more important to survival than wants.

Economic wants can be defined as the goods and services that are desired by consumers but are not important for their survival. Some examples of economic wants are mobile phone, automobile cars, computer, clothes, television, furniture, etc.

Economic needs can be defined as the goods and services that are required by the people or consumers for their daily survival. Some examples of economic needs are: shelter, food, water, land, air, etc.

In conclusion, economic wants are less important because they are just our different desires in life but economic needs are very important and significant for the daily survival of humans because they are the basics of life.

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Answer:

La fuerza ejercida sobre el piso del elevador hacia abajo es aproximadamente 1,004.075 N

Explanation:

Fuerza = Masa × Aceleración

El peso de la caja = 800 N

La velocidad hacia abajo = 5.0 m / s

Tomando la aceleración debida a la gravedad, g = 9,8 m / s²

La masa del cuerpo, m = 800 N / g = 800 N / (9,8 m / s²) ≈ 81,63 kg

La fuerza ejercida sobre el piso del ascensor durante la aceleración hacia arriba, 'N', se da como sigue;

N = m · g + m · a

a = 2,5 m / s²

∴ N = 81,63 kg × 9,8 m / s² + 81,63 × 2,5 m / s² = 800 N + 81,63 × 2,5 m / s² ≈ 1,004,075 N

La fuerza ejercida sobre el piso del ascensor hacia abajo ≈ 1,004.075 N

Answer:

400n

Explanation:

Hope this helps:)

Answer:

Unbalanced forces change the motion of an object. If an object is at rest and an unbalanced force pushes or pulls the object, it will move. Unbalanced forces can also change the speed or direction of an object that is already in motion.

Answer:

B. the position of the object