Review. Why is the following situation impossible? An athlete tests her hand strength by having an assistant hang weights from her belt as she hangs onto a horizontal bar with her hands. When the weights hanging on her belt have increased to 80% of her body weight, her hands can no longer support her and she drops to the floor. Frustrated at not meeting her hand-strength goal, she decides to swing on a trapeze. The trapeze consists of a bar suspended by two parallel ropes, each of length l , allowing performers to swing in a vertical circular arc (Fig. P8.68). The athlete holds the bar and steps off an elevated platform, starting from rest with the ropes at an angle θi = 60.0° with respect to the vertical. As she swings several times back and forth in a circular arc, she forgets her frustration related to the hand-strength test. Assume the size of the performer's body is small compared to the length l and air resistance is negligible.

Answer:

4 seconds

Explanation:

Answer:

175

Explanation:

its for Acellus

The potential difference is V=1.743*10^-7

The voltage is generally referred to as the electric potential difference and  it can be measured using a voltmeter. The electrical potential difference between the two plates is expressed as q=CV.

CALCULATION

we know,

q=CV

q={EA/d}*V

here q= 5.24*10^-8C

       A=8.22*10^-5m^2

       d=2.42*10^-8m

therefore , C={( 8.85*10^-12)*(8.22*10^-5)}/(2.42*10^-8)

                 C=3.006*10^-1

q=CV

q/C=V

V=1.743*10^-7

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True, Charles's law provides an explanation for why hot air balloons float. Charles's law states that when a gas is heated, its volume expands.

This is because the heated gas particles move faster and collide with the container walls more frequently, creating more pressure and causing the gas to expand. In the case of a hot air balloon, the balloon is filled with hot air which is less dense than the surrounding cool air. As a result, the hot air balloon experiences a buoyant force that is greater than its weight, causing it to float upward.

The hot air balloon works on the principle of buoyancy, which is the upward force on an object immersed in a fluid, due to the difference in density between the object and the fluid. When the air inside the balloon is heated, it becomes less dense and rises above the cooler air, creating a difference in pressure and causing the balloon to float upwards. Charles's law provides the scientific explanation for why the hot air inside the balloon expands, which in turn causes the balloon to become less dense and rise. Therefore, the statement that Charles's law provides an explanation for why hot air balloons float is true.

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The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.

When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.

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Answer:

No

Explanation:

The gravitational force always acts opposite the direction of motion. Air resistance only acts on objects that are moving. The force of friction does not exist when an object is stationary. All objects experience a normal force.

btw pls mark as branliest! Thanks!

Hello, for this applicate formula:

Vf² = Vo² + 2gh

Data:

Vf = Final Velocity = ¿?

Vo = Initial veloctiy = 0 m/s

g = Gravity = 9,81 m/s²

h = Height = 5 m

Replacing according our data:

Vf² = 0 m/s² + 2(9,81 m/s²)(5 m)

Vf² = 98,1 m²/s²

Vf = √98,1 m²/s²

Vf = 9,9 m/s

The final velocity will be 9,9 meters per second.

The answer is 9.9 m/s

A joint that allows movements in many directions around a central point is known as a ball-and-socket joint.

This type of joint is formed by a ball-shaped surface of one bone fitting into a cup-like depression of another bone. The ball-and-socket joint allows movement in all directions, including flexion, extension, abduction, adduction, and rotation. Examples of ball-and-socket joints in the human body include the hip joint and the shoulder joint. The hip joint connects the thigh bone (femur) to the pelvic bone and is responsible for supporting the weight of the upper body and enabling a wide range of movements, such as walking, running, and jumping. The shoulder joint, also known as the glenohumeral joint, connects the upper arm bone (humerus) to the shoulder blade (scapula) and allows movements such as lifting the arm above the head, reaching behind the back, and rotating the arm.

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Given :

Mass of block , m = 1.35 kg .

Speed constant , k = 15 N/m .

Speed at centre , v = 34 cm/s = 0.34 m/s .

To Find :

The amplitude of oscillation .

Solution :

Now , we know total energy is conserved in SHM .

So , K.E at zero displacement :

\(K.E=\dfrac{mv^2}{2}\\\\K.E=\dfrac{1.35\times 0.34^2}{2}\\\\K.E=7.8\times 10^{-2}\ J\)

Now , this K.E is equal to maximum P.E :

\(P.E=K.E=7.8\times 10^{-2}\ J\) .

\(P.E=\dfrac{kA^2}{2}\\\\7.8\times 10^{-2}=\dfrac{kA^2}{2}\\\\A=\sqrt{\dfrac{2\times 7.8 \times 10^{-2}}{15}}\ m\\\\A=0.1019 \ m\\\\A=10.2\ cm\)

Therefore , the amplitude is 10.2 cm .

Hence , this is the required solution .

The average circumference of the two balloons for each amount of sugar are as follows; No sugar: 31.4 cm Some sugar: 34.54 cm More sugar: 40.84 cm

The circumference of a balloon is given by the formula;

C = 2πr

where r is the radius of the balloon. We can find the average circumference of the two balloons for each amount of sugar as shown below. No sugar: The circumference of the balloon with no sugar is given by

C1 = 2πr1

We can find the average circumference of the two balloons as follows;

Average circumference = (C1 + C1)/2 = (2πr1 + 2πr1)/2= 2πr1= 2 × 3.14 × 5= 31.4 cm

(to one decimal place)Some sugar: The circumference of the balloon with some sugar is given by

C2 = 2πr2

We can find the average circumference of the two balloons as follows; Average circumference

= (C1 + C2)/2 = (2πr1 + 2πr2)/2= (2 × 3.14 × 5) + (2 × 3.14 × 6)/2= 2 × 3.14 × 5.5= 34.54 cm

(to two decimal places)More sugar: The circumference of the balloon with more sugar is given by

C3 = 2πr3

We can find the average circumference of the two balloons as follows; Average circumference

= (C2 + C3)/2 = (2πr2 + 2πr3)/2= (2 × 3.14 × 6) + (2 × 3.14 × 7)/2= 2 × 3.14 × 6.5= 40.84 cm (to two decimal places)

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The angle of incidence in the glass is approximately 31.8°.

To find the angle of incidence in the glass, we can use Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction:

n1 * sin(angle of incidence) = n2 * sin(angle of refraction)

In this case, n1 is the index of refraction for flint glass (1.61), n2 is the index of refraction for ethanol (1.36), and the angle of refraction in ethanol is 27.2°.

Plugging in these values into Snell's law, we get:

1.61 * sin(angle of incidence) = 1.36 * sin(27.2°)

To find the angle of incidence, we can rearrange the equation:

sin(angle of incidence) = (1.36 * sin(27.2°)) / 1.61

Now, we can solve for the angle of incidence by taking the inverse sine (or arcsine) of both sides:

angle of incidence = arcsin((1.36 * sin(27.2°)) / 1.61)

Calculating this value, the angle of incidence in the glass is approximately 31.8°.

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Methane gas in the clouds of Neptune and Uranus is responsible for their Bluish-green appearance.

The colour of Neptune is more bluish rather than being bluish-green. The atmosphere of methane is composed of 80% hydrogen, 19% helium and just 1% methane, but the methane is present in the clouds of the planet which absorbs the red light and infrared spectrum and emits back the blue light outward and the same blue light we see.

Nearly similar composition of atmosphere is of Uranus , where the methane gas is present in the clouds. But in addition to that Uranus’ atmosphere is more thick and also has some deposits of hydrogen sulfide, ice and some photochemicals which gives the planet a bluish-green colour.

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Answer:

Explanation:

In this problem we are required to find the potential energy possessed by the television

Given data

mass of television m = 15 kg

height  added above the ground, h= 1-0.3 = 0.7 m

acceleration due to gravity g = 9.81 m/s^2

apply the formula for potential energy we have

P.E= m*g*h

P.E = 15*9.81*0.7 = 103 Joules

Based on the nature of variables, none of the evidence card should be eliminated because they all represent variables.

Variables refers to any quantity that can have various values.

Variables include age, time , distance, height, speed, etc.

Variables can either be independent, dependent or constant.

There, none of the evidence card should be eliminated because they all represent variables.

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The astronaut can she move herself back towards the space station by throwing a tool on the direction opposite to the shuttle.

According to Newton's Third Law, if an astronaut tosses a tool away from the space shuttle, she will exert a force in that direction while also being subject to a reaction force in that same direction. Since there are no drag forces in space, the astronaut's gained acceleration (in accordance with Newton's second law) would eventually propel her back to the shuttle.

According to Newton's second law of motion, force is equal to the rate at which momentum changes. Force is defined as mass times acceleration for a constant mass. Therefore, the astronaut can she move herself back towards the space station by throwing a tool on the direction opposite to the shuttle.

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The 40mm rubber ball munition used by the Marines typically contains rubber balls that have a caliber of 40mm. The caliber refers to the internal diameter of the barrel or the diameter of the projectile itself.

In this case, the munition is specifically designed for 40mm launchers or firearms. The 40mm rubber ball munition is commonly used for crowd control and non-lethal force situations.

The rubber balls are designed to be less lethal compared to traditional ammunition, as they are intended to incapacitate or disperse individuals without causing fatal injuries.

These rubber balls are usually made from a durable and dense rubber material that allows them to be fired accurately and effectively.

The 40mm caliber provides a suitable size for the rubber balls to be propelled with sufficient force and accuracy while minimizing the risk of causing severe harm.

It is important to note that specific details regarding munitions can vary based on the manufacturer and specific military specifications.

Therefore, it is always recommended to refer to official military sources or consult with experts for precise and up-to-date information on the caliber of rubber balls used in the 40mm rubber ball munition for the Marines.

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Based on the Gauss's law for magnetism, we can conclude that the divergence of the magnetic field vanishes (∇ · B = 0).

To show that the divergence of the magnetic field vanishes, we can start with the Maxwell's equations in differential form. One of the equations, known as Gauss's law for magnetism, states:

∇ · B = 0, where ∇ · B represents the divergence of the magnetic field B.

This equation implies that the net flow of magnetic field lines out of a closed surface is zero, indicating that there are no magnetic monopoles (sources or sinks of magnetic field) in existence.

The divergence of a vector field represents the amount of "flow" or "spreading" of that field from a given point. If the divergence is zero, it means that the field is neither converging nor diverging at that point, resulting in a closed flow pattern.

Therefore, based on the Gauss's law for magnetism, we can conclude that the divergence of the magnetic field vanishes (∇ · B = 0).

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Answer:

When the both the forces are acting in the same direction

Explanation:

Answer:

The resultant of these two forces will be the greatest when the two forces are in the same direction.

Explanation:

Let \(F_1\) and \(F_2\) denote these two forces. The resultant of these two force would be the vector sum \((F_1 + F_2)\).

Refer to the diagram attached. Join the head of \(F_1\) to the tail of \(F_2\). Under this construction, the vector connecting the tail of \(F_1\!\) to the head of \(F_2\!\) (the vector shown with a lighter color) would represent the resultant vector \((F_1 + F_2)\).

Consider the triangle inequality: as long as \(F_1\) and \(F_2\) (the first two sides of the triangle in the diagram) are not parallel to one another, the magnitude of the resultant vector would always be smaller than the sum of the magnitude of \(F_1\!\) and that of \(F_2\!\).

In other words: \(\| F_1 + F_2 \| < \| F_1 \| + \| F_2 \|\).

However, notice that when \(F_1\) and \(F_2\) are in the same direction, the three sides \(F_1\!\), \(F_2\!\), and \((F_1 + F_2)\) are in the same line and no longer form a triangle.

On the other hand, if \(F_1\) and \(F_2\) are opposite to one another, \(\| F_1 + F_2 \| = \| F_1 \| - \| F_2 \|\).

The magnitudes of the two forces, \(\| F_1 \| = 5\; \rm N\) and \(\| F_2 \|= 3\; \rm N\), are fixed. Hence, when the two forces are in the same direction, \(\| F_1 + F_2 \| = \| F_1 \| + \| F_2 \| =8\; \rm N\).

As long as \(F_1\) and \(F_2\) are not in the same line, the triangle inequality ensures that \(\| F_1 + F_2 \| < \| F_1 \| + \| F_2 \| =8\; \rm N\).

Hence, \(8 \rm \; N\) would be the greatest magnitude that the resultant force could achieve. That value is reached when the two forces are in the same direction.

About 4.5 mol of water will be created when the platinum-based engine is run continuously at 300 K for an hour with 0.5 atm of H2 and 0.5 atm of O2 injected for each reaction.

For fuel cell engines' electrodes, platinum is a requirement. It acts as an electrocatalyst to speed up the electrochemical reactions needed to induce H2 to release electrons and form H2 ions when it is placed on porous electrodes.

Platinum is particularly well suited as a fuel cell catalyst because it makes it possible for the hydrogen and oxygen reactions to occur at an ideal rate and because it is stable enough to withstand both the intense electrical current density and the complex chemical environment found inside a fuel cell. This allows platinum to function effectively over an extended period of time.

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Answer:

Scientists are developing techniques to detect signatures from space in their search for alien life.

The Very Large Array (VLA) telescope, at the National Radio Astronomy Observatory (NARO) site in Socorro, New Mexico, will be used to constantly seek evidence of technosignatures.

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A cable with a tension of 45 N is used to suspend a 5 kg mass M against a wall. The magnitude and direction of the force of friction between the mass and the wall is zero.

The force that prevents motion when the surfaces of two objects come into contact is known as friction. Friction lessens a machine's mechanical advantage, or, to put it another way, friction decreases the output to input ratio. A car spends one-fourth of its energy reducing friction. However, friction in the clutch and the tires also contribute to the vehicle's ability to maintain its position on the road. Friction is one of the most important phenomena in the physical world, affecting everything from machines to molecular structures to matches.

The magnitude of the force of friction between the mass and the wall is equal to the weight of the mass (mg) if the mass is not moving.

In this case, the weight of the 5 kg mass is equal to 5 kg x 9.8 m/s² = 49 N.

Since the tension of the cable is greater than this, the magnitude of the force of friction between the mass and the wall is 0N.

The direction of the force of friction is away from the wall since there is no force of friction due to the cable's tension.

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The latitude and longitude coordinates for Location C are given as 50S, 68W. Therefore, the correct answer is 4) Cannot discern from the information provided.

Latitude and longitudinal lines are shown on a globe of Earth as parallel and vertical lines. To determine which distance is farther, we need to compare the distance between Location B and the Equator with the distance between Location C and the Equator.

However, the latitude and longitude coordinates for Location B and the specific direction or coordinates of the Equator are not provided. Without this information, it is not possible to determine which distance is farther between Location B and the Equator or Location C and the Equator.

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Answer:

it is true

Explanation:

because the backward force you feel when your car accelerates is caused by your body's inertia

Answer:

Your answer will be 600meters

When light is transmitted through an object things can happen. The light could be reflected by the thing. Or it could be absorbed by the object. Saying this based on what I know.

Answer:

The amount of oxygen in ocean water increases as temperature increases. Sunlight penetrates the top layers of the ocean, so photosynthesis occurs there. Nutrients, minerals, and gases are more available to marine life in the bottom layers of the ocean.

Explanation:

The correct statement regarding the resolution of a grating is that the resolution increases with the number of grooves per mm, the correct option is (c).

The resolution of a grating is defined as the ability to separate two closely spaced spectral lines or wavelengths. It is determined by the number of grooves per unit length on the grating surface, as well as the wavelength of the incident light and the angle of incidence.

A higher number of grooves per mm means that the grating will disperse the incoming light into more angles, resulting in higher resolution. Therefore, the number of grooves per mm is the primary factor that determines the resolution of a grating, the correct option is (c).

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The complete question is:

Which statement is true regarding the resolution of a grating?

a. resolution increases with wavelength

b. resolution decreases with number of grooves per mm

c. resolution increases with number of grooves per mm

d. resolution is not determined by the monochromator

e. resolution increases with slit width

Answer:

It would go out the bottom hole faster.

Explanation:

It goes down the bottom hole faster because the water would get poured out the bottom before they even flipped the water bottle.

Answer:

So work require will be 3888×10×10³J

Explanation:

⇒Work done=Change in kinetic energy

⇒KE=1/2mv²

⇒Mass->15000kg

⇒Velocity->72km/h

⇒KE=1/2×15000×(72)²

⇒KE=1/2×15000×5184

⇒KE=7500×5184

⇒KE=3888×10×10³J