An 80 kg skier stands at the top of a 40-meter slope. She then skis down the slope. What is her approximate speed at the bottom of the slope if friction is negligible and her kinetic energy is 31360 J?

The weight of the hawk is found to be 25 N.

The tension is the force that acts on the wire. Given the fact the we are told in the question that a  hawk sits on a telephone wire. If the wire dips so that it makes a 30 degree angle with the horizontal, and the tension in the wire is 25 N.

The image that depicts this problem have been attached to this solution. Now we have from the image that we have attached to this answer;

W = 2T sin θ

W = 2 * 25 * sin 30

W = 2 * 25 * 0.5

W = 25 N

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Answer:4

Explanation:

on edge 2020

The triple alpha process is a nuclear fusion process that occurs during helium flash and is responsible for the production of helium in massive stars. It requires a temperature of about 5,000,000 K to operate and produces the neutrinos we receive from the sun.

These not directly related to the pulsations in cepheid variable stars, which are controlled by other factors such as the star's mass and composition. The triple alpha process is the nuclear fusion of hydrogen to helium in massive stars. This process requires a temperature of about 5,000,000 K to operate and occurs during helium flash. It is not directly related to the pulsations in Cepheid variable stars or the production of neutrinos we receive from the sun.

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Answer:

dang this hard

Explanation:

i will try to help

Answer:

c

Explanation:

cuz its informing the length of 5 and weight on 20N

Explanation:

Please Tell me About this question if you know que is transformer is used in rectifier to step up or step down voltage?

Answer:

Speed = 3 m/s

Explanation:

Given the following data;

Distance = 2700m

Time = 900 s

To find the speed;

Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.

Mathematically, speed is given by the formula;

\(Speed = \frac{distance}{time}\)

Substituting into the equation, we have;

\(Speed = \frac{2700}{900}\)

Speed = 3 m/s

With 30,000ml of air left in a used tank, taking in full inspiratory reserve volume with panic breaths, one can inhale around 20 times before the air runs out.

You can breathe normally 20 times until the air runs out after diving into the water, discovering a used air tank with 30,000 ml of air left, and panicking while inhaling the entire inspiratory reserve volume with each breath. The quantity of air that can be breathed more than the tidal volume is known as the inspiratory reserve volume. An adult in good health has an average inspiratory reserve capacity of about 3,000 ml.

As a result, you may take about 10 complete breaths with 30,000 ml of air still in the tank, multiplied by 3,000 ml for every breath. The inspiratory reserve capacity is expected to rise during panic breathing, leading to smaller breaths and more frequent inhalations, allowing for about 20 breaths. In a survival crisis, it's critical to maintain composure and save air.

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The formula V = π r² h or V = π R² H is used to measure the volume of a cylinder.

The volume of a cylinder is the density of the cylinder which indicates the amount of material that can be held in it or how much amount of any material can be immersed in it. To find a cylinder's volume, the formula to be used is v = π r² h (V = π R² H). In this formula, V is the volume of the cylinder; π r² represents the area of the base of the cylinder, with radius 'r'; h is the height of the cylinder.

Therefore, the given V = π r² h or V = π R² H is the formula to calculate a cylinder's volume.

"

Correct question is as follows:

What formula is this V = Πr²h or V = π R² H?

"

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The lever family and the inclined plane family are used to categorize the six simple machines by scientists.

an uncomplicated device with a flat surface that is elevated on one end. 3. A rope and a wheel make up the basic components of the pulley. Rope slides well into wheel groove. The burden is secured with one end of the rope. Lifting large objects is accomplished with the use of an inclined plane, a straightforward device with a sloping surface.

Taking into account friction, less force is needed to move an object up a slope than the weight being raised. More closely the necessary force approaches the actual weight, the steeper the slope or incline. Heavy loads can be raised or lowered to a specific height or depth across an inclined plane, which is a hard sloping surface.

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The amount of heat that must be carried away by the cooling system is 2351 joules.

To calculate the amount of heat that must be carried away by the cooling system, we can use the first law of thermodynamics. This law states that the change in internal energy (∆U) of a system is equal to the heat (Q) added to the system minus the work (W) done by the system. Mathematically, it is represented as:

∆U = Q - W

Given the provided information, the work done by the automobile engine is 520 joules, and the change in internal energy is -2871 joules. We need to find the amount of heat (Q). Plugging in the given values, we get:

-2871 = Q - 520

Now, to find Q, we can simply add 520 to both sides of the equation:

Q = -2871 + 520

Q = -2351 joules

Therefore, the amount of heat that must be carried away by the cooling system is -2351 joules. A negative value indicates that heat is being removed from the system.

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Answer:

Explanation:

c

C

Answer:

1. PE = mgh

2. When the ball reaches its highest point

3. 21,599,200

4. The object's mass, gravity, and height determine its potential energy

5. Members of a team work together to create a plan, and then members choose different tasks to carry out the plan.

Explanation: Finished the quick check :)

The statement that must be true of an extended body experiencing a net force of zero is that the center of mass of the extended body is not accelerating.

When an extended body experiences a net force of zero, it means that the vector sum of all the forces acting on the body is zero. According to Newton's second law of motion, F = ma, where F is the net force, m is the mass, and a is the acceleration. Since the net force is zero, the acceleration of the body is also zero. In an extended body, different parts of the body may experience different forces, causing them to accelerate or decelerate. However, the center of mass of the body represents the point where the body's total mass is concentrated. If the net force is zero, the center of mass remains at rest or moves with a constant velocity, indicating that it is not accelerating.

Therefore, the correct statement is that the center of mass of the extended body is not accelerating.

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The machine's efficiency is 81.61%, indicating that it converts 81.61% of the input energy into useful output energy, while the remaining percentage is lost as waste or dissipated in the process.

To calculate the efficiency, we can use the formula:

Efficiency = (Actual Output / Design Capacity) × 100

Given:

Actual Output = 7,407

Design Capacity = 9,050

Substituting the values into the formula:

Efficiency = (7,407 / 9,050) × 100

          = 0.817 × 100

          = 81.61%

Therefore, the efficiency of the machine is 81.61%.

Efficiency is a measure of how effectively a machine or system is utilizing its available capacity. In this case, the machine has a design capacity of 9,050 units, but it only produced an actual output of 7,407 units.

By dividing the actual output by the design capacity and multiplying by 100, we find that the machine's efficiency is 81.61%. This indicates that the machine is operating at approximately 81.61% of its full capacity.

A higher efficiency percentage would indicate a more optimal utilization of the machine's capacity, while a lower percentage suggests room for improvement in maximizing output.

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The acceleration of block B is 4.26 m/s^2 downwards due to the net force acting on it, which is the difference between the tension and the gravitational force.

To calculate the acceleration of block B, we need to consider the forces acting on it. Block B is connected to block A by a cable that has a tension of 3 N. Block B is also subject to a gravitational force of 39.2 N (4 kg x 9.8 m/s^2).

The net force acting on block B is the difference between the tension and the gravitational force, which is 3 N - 39.2 N = -36.2 N. Since the net force is negative, the acceleration of block B is also negative, which means it is moving downwards.

To calculate the magnitude of the acceleration, we use Newton's second law: F = ma, where F is the net force, m is the mass of the object, and a is the acceleration. Solving for a, we get a = F/m = -36.2 N / 4 kg = -9.05 m/s^2. The negative sign indicates that the acceleration is downwards.

However, the question asks for the magnitude of the acceleration, which is the absolute value of -9.05 m/s^2, which is 9.05 m/s^2. Therefore, the acceleration of block B is 4.26 m/s^2 downwards.

In conclusion, the acceleration of block B is 4.26 m/s^2 downwards due to the net force acting on it, which is the difference between the tension and the gravitational force.

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Answer:

16.67 s

Explanation:

Given that the

Grant sprints 50m to the right with an average velocity of 3 m/s.

According to definition of speed,

Speed = distance/time

Substitute speed and distance into the formula.

3 = 50 / t

Make time t the subject of formula

t = 50 / 3

t = 16.667 seconds

Therefore, the number of seconds the Grant sprint is 16.7 s approximately.

The voltage drop across the diode is minimal and can be considered as zero or approximately 12 V.Consequently, the voltage across the diode is negligible or approximately 12 V.

In the given problem, a reverse-biased silicon diode is connected in series with a 12 V source and a resistor. We need to find the voltage across the diode. To determine the voltage across the diode, we need to know about the reverse-biased diode and how it operates. In a reverse-biased diode, the p-type region of the diode is connected to the negative terminal of the battery, and the n-type region is connected to the positive terminal. In this way, a potential barrier is formed across the diode. A voltage applied in the forward direction increases the current flow, while a voltage in the reverse direction reduces the current flow and impedes it.

Due to this reason, the resistance of the diode in a reverse-biased condition is very high. The value of this resistance depends on the characteristics of the diode and can be of the order of millions of ohms or even more. Thus, in a reverse-biased silicon diode connected in series with a 12 V source and a resistor, the voltage across the diode is approximately 12 V as the diode offers very high resistance in the reverse direction, and a minimal amount of current flows through it. the voltage across the diode is approximately 12 V.

We know that a reverse-biased silicon diode is connected in series with a 12 V source and a resistor. When the diode is reverse-biased, it offers very high resistance, and a minimal amount of current flows through it. Therefore, the voltage drop across the diode is minimal and can be considered as zero or approximately 12 V. Consequently, the voltage across the diode is negligible or approximately 12 V.

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Answer:

The field will remain the same

Explanation:

This is because electric field given as

E1= kq1/r²

And that of second charge

E² = kq2/r²

Is not affected by the size of the second charge q2

W is a constant measure of angular velocity. It is the speed at which the ladybug rotates or moves in a circle.

Examples of angular velocity include a race car traveling in a circle, a Ferris wheel, and a roulette ball on a wheel. Furthermore, the object's angular displacement with respect to time is represented by the object's angular velocity. With in radians per second-squared and t in seconds, a wheel's angular acceleration is given by =6. 0t44. 0t2. While angular speed just describes magnitude, angular velocity is a vector term that also expresses direction. By applying the right hand rule, angular velocity is determined in one direction. By holding the axis with your right hand and rotating your fingers in the direction of the spinning body, you will, according to the right hand rule, get your thumb pointing in the direction of the angular velocity.

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Answer:

b

Explanation:

The Coriolis effect is a condition which causes a hurricane to rotate in a particular direction. Thus, the correct option is B.

Hurricanes are the enormous storms which come with a rotating wind speed of about 74 miles per hour. The rotating wind that swirls across the warm water of the tropics and also comes with a terrifying force.

The Coriolis force is an inertial or the fictitious force, which acts on the objects which are in motion within a frame of reference that rotates them with respect to an inertial frame. In a reference frame, with the clockwise rotation, the force acts to the left of the motion of the object. Whereas, in one with anticlockwise or counterclockwise rotation, the force acts to the right of the object. The deflection of an object due to this Coriolis force is called as the Coriolis effect.

Therefore, the correct option is B.

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Answer:

Henri’s wave and Geri’s wave have the same amplitude and the same energy

Explanation:

The amplitude of a wave is the distance between the midpoint and the trough (or the crest). This is equivalent to half the distance between the trough and the crest. Therefore:

The energy of a wave is directly proportional to its amplitude.

Answer:

its letter b

Explanation:

Answer:

C

Explanation:

Answer:

λ = 75 µm, correct is A

Explanation:

In waves, speed is related to wavelength and frequency

          c = λ f

          λ = c / f

in this exercise indicate the frequency of rationality

          f = 4 THz = 4 10¹² Hz

let's calculate

        λ = 3 10⁸/4 10¹²

        λ = 7.5 10⁻⁵ m = 75 10⁻⁶ m

        λ = 75 µm

To find the electric field produced by a uniformly charged half ring, we can use the principle of superposition. We'll divide the half ring into infinitesimally small charge elements and integrate their contributions to obtain the total electric field at point P.

Consider an infinitesimal charge element, ΔQ, on the half ring. The linear charge density, λ, is defined as the charge per unit length. Therefore, the charge of the infinitesimal element can be written as ΔQ = λds, where ds is the length of the infinitesimal element.

The electric field dE produced by this element at point P can be calculated using Coulomb's law. Since the electric field due to a point charge is given by E = kQ/r^2, where k is the Coulomb constant, Q is the charge, and r is the distance between the charge and the point of interest, we have:

dE = (kΔQ)/(r^2),

To determine r, we can consider the right triangle formed by the line connecting the charge element to point P, the radius of the half ring, and the distance z0. Using the Pythagorean theorem, we have:

r^2 = (z0)^2 + (R - ds)^2.

dE = (kλds)/[(z0)^2 + (R - ds)^2].

To find the total electric field at point P, we integrate the contributions from all infinitesimal charge elements. Integrating from 0 to π (since we have a half ring), we have:

E = ∫[0 to π] (kλds)/[(z0)^2 + (R - ds)^2].

Unfortunately, due to the complexity of the integral, it is difficult to obtain an explicit expression for the electric field. However, you can use this integral to numerically compute the electric field at any point P of interest, given the values of λ, R, and z0.

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   The index of refraction of the material through which red light passes is n = 1.44

  The index of refraction is the ratio of the speed of propagation of the speed of light in a vacuum to the speed of light in a given medium.

n = c/v

  The relationship is studied by Snell's Law, and relates the index of refraction in different media and allows us to find the angles of refraction of a ray of light, by means of the equation:

  The wavelength of red light in vacuum is 650nm, if in the material the wavelength value is 450nm, we apply the following equation:

f = C/λ

f = 3×10⁸m/s / 650×10⁻⁹m

f = 4.61×10¹⁴ Hz

V = λf

V = 450×10⁻⁹m * 4.61×10¹⁴ Hz

V = 207450000 m/s

n = 3×10⁸m/s / 207450000 m/s

n = 1.44

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Answer:

0.000025s

Explanation:

Period it’s. : T(s)= 1/f(Hz)=1/40000Hz=0.000025s

Answer:

Grandma will arive \(\frac{1}{2}\)hr later

Explanation:

\(s=20\\d=210 mi|\\ s=70 mi|h \\ \\ \frac{60}{1} =\frac{210}{+} = 3.5 hrs\)