how much pressure does a 7000-kg elephant exert on the ground? the circular cross-section of each foot has a diameter of 50 cm.

Answer:

Both have same energy

Explanation:

Given:

Sample 1

Mass m = 2 kg

Velocity v = 10 m/s

Sample 2

Mass m = 2 kg

Height h = 5 m

Assume g = 10 m/s²

Find:

What has more energy

Computation:

In sample 1

Ke = 1/2(m)(v)²

Ke = 1/2(2)(10)²

Ke = 100 joule

In sample 2

Pe = mgh

Pe = (2)(10)(5)

Pe = 100  joules

Both have same energy

Answer:

charged particles build upon an object surface

Equipment: Power supply, Ammeter (0-1A), Voltmeter (0-10V), Rheostat, Connecting wires, Wire of known length and diameter, Crocodile clips, Meter ruler, Micrometer screw gauge, and a Switch,

Method:

Set up the circuit with the wire of known length and diameter connected to the circuit.

Use the micrometer screw gauge to measure the diameter of the wire at several points along its length, and take an average of these values.

Measure the length of the wire using the meter ruler.

Set the rheostat to maximum resistance, and close the switch.

Gradually decrease the resistance using the rheostat until the ammeter reads approximately 0.5A.

Record the voltmeter reading.

Increase the current to approximately 1A and record the voltmeter and ammeter readings.

Repeat the measurements two more times, ensuring that the wire has cooled down between measurements to avoid any heating effects on the wire resistance.

Calculate the resistance of the wire for each set of readings using the formula R=V/I.

Take an average of the three values obtained for the resistance of the wire.

Calculate the cross-sectional area of the wire using the formula A=πr².

Use the resistance and cross-sectional area of the wire to calculate the resistivity of the material using the formula ρ = RA/L, where R is the resistance, A is the cross-sectional area, and L is the length of the wire.

Note: It's important to make sure that the wire is not heated up during the experiment, as this can affect the resistance and give inaccurate readings. Also, be careful when handling the wires and equipment to avoid electric shocks.

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The term used to describe the sliding motion within the layers of an object is "shear."

Shear refers to the deformation that occurs when layers of a material slide or move in relation to each other, parallel to their planes. This type of motion can happen in various materials, including solids, fluids, and even gases.

In the context of solids, shear can occur when a force is applied parallel to a surface or when there is a difference in movement between adjacent layers.

This can lead to the layers sliding past one another, resulting in a shearing or shearing deformation. Shear can cause changes in shape, stress distribution, and material properties within the object.

Shear is an essential concept in fields such as materials science, engineering, and physics.

Understanding shear behavior is crucial for designing structures, analyzing material properties, and predicting the response of materials under different loads and conditions.

Various mathematical models and equations, such as the shear stress and shear strain relationship, are used to quantify and describe shear deformation in materials.

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Answer:

8.57 m

Explanation:

To solve the problem, we have to decompose the two vectors along the two directions first:Vector A:- x component: Ax = +9.66 m- y compoment: Ay = 0 (the vector lies along the x-axis)Vector B:- x component: - y component: So now we can find the sum of the two vectors by adding the components along each axis:And the magnitude of the sum is given by Pythagorean theorem:

Answer:

28 N

Explanation:

Given,

Work ( W ) = 560 J

Distance ( s ) = 20 m

To find : Force ( F ) = ?

Formula : -

W = Fs

F = W / s

F = 560 / 20

F = 28 N

Answer:  2.67 m/s2

Explanation:

W = mg = (22.4 kg)(9.8 m/s2) = 219.52 N

Wx = (219.52 N)(sin 22) = 82.2 N

Wy = (219.52 N) (cos 22) = 203.5 N

Wy = N (normal force on the block) = 203.5 N

Ff (force of friction) = (coeff. friction)(N) = (0.11)(203.5 N) = 22.4 N

Sum the forces in the x-direction (direction of motion down the ramp):

Fnet = Wx - Ff = 82.2 N - 22.4 N = 59.8 N

a = F/m = 59.8 N / 22.4 kg = 2.7 m/s2

Acceleration will be zero when there is no movement.  The coefficient of static friction is 0.6

Friction is a force that opposes motion. It is static in a stationary object while dynamic in a moving object.

Given that Block A has a mass of 10 kg and block B has a mass of

6 kg. They are connected by a rope and pulley system as shown in the diagram in the question. Since both blocks are not moving, acceleration a = 0

The weight W on block B = mg

W = 6 × 9.8

W = 58.8 N

This weight will be equal to the tension T pulling block A. That is,

T = μN = W

Where the normal force N on block A = mg

N = 10 × 9.8

N = 98 N

Substitute N and T to find the coefficient of static friction μ

58.8 = 98μ

μ = 58.8/98

μ = 0.6

Therefore, 0.6 must be the coefficient of static friction between block A and the table for neither block to move

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To calculate the radiation pressure on a highly polished metal surface, the most appropriate approximation to use is the small-angle approximation.

Radiation pressure refers to the pressure produced when electromagnetic radiation is absorbed or reflected by a surface. A highly polished metal surface is highly reflective, and therefore is expected to produce high radiation pressure.

The small-angle approximation is the assumption that the angle of incidence is small enough such that the sine of the angle is equal to the angle itself. This approximation is particularly useful in situations where the angle of incidence is small relative to 1 radian or less. This approximation can be used to calculate radiation pressure on highly polished metal surfaces because the angle of incidence is usually small (typically less than 1 radian), and therefore can be approximated using the small-angle approximation.

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The cart's final kinetic energy is four times as great as its initial kinetic energy in joules.

The kinetic energy of an object is given by the formula KE = 1/2 mv^2, where m is the mass of the object and v is its velocity. The unit of kinetic energy is   (J). The initial kinetic energy of the cart is KE1 = 1/2 (100 kg), where velocity is (5 m/s)^2 = 1250 J. The final kinetic energy of the cart is KE2 = 1/2 (100 kg)(10 m/s)^2 = 5000 J. Therefore, the final kinetic energy is four times as great as the initial kinetic energy.

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Sodium metals will release photoelectrons with the highest kinetic energy when they are exposed to light with a wavelength of 240 nm.

The metal, whose work function is the lowest, will release photoelectrons with the highest kinetic energy. The photoelectrons emitted from sodium will have the highest kinetic energy because sodium has the lowest work function in the given situation.If the metal's ionization potential is low, the photoelectric effect is easily observed. Because of its low ionization potential, the alkali metal cesium is ideally suited for the photoelectric effect.Four metals are exhibiting photovoltaic effect as a result.Due to the high ionization energy, lithium metal does not emit photoelectrons.

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Standard conditions refer to a specific set of temperature, concentration, and pressure values, which are commonly used in scientific experiments and calculations to provide a consistent basis for comparison.

In most thermodynamic calculations, standard conditions are defined as a temperature of 298.15 K (25°C), a concentration of 1 mol/L (1 M) for solutions, and a pressure of 1 atm (101.325 kPa) for gases. These conditions are important because they serve as a reference point, allowing scientists to easily compare the properties and behavior of various substances under the same set of conditions.

The use of standard conditions simplifies calculations and ensures that the results are consistent across different studies. By providing a uniform reference point, researchers can focus on the effects of specific variables, such as the type of substance, its structure, or its interactions with other substances, without having to account for variations in temperature, concentration, or pressure.

To summarize, standard conditions for most thermodynamic calculations involve a temperature of 298.15 K (25°C), a concentration of 1 mol/L (1 M) for solutions, and a pressure of 1 atm (101.325 kPa) for gases. These conditions provide a consistent basis for comparison, enabling scientists to examine the properties and behavior of various substances under the same set of conditions.

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Answer:

artist

Explanation:

Answer:

DMs are not accessible anymore. I assume Zuka is a staff member? the only way to talk to a staff member anymore is to report something, but even then, the probably won't even look at what they're deleting :/

May I have brainliest please? :)

Answer:

When the velocity is set to a constant value, the displacement increases with time but the acceleration remains zero

Explanation:

plato

When the velocity is set to a constant value, the displacement increases with time but the acceleration remains zero.

When the velocity is set to a constant value, the displacement increases with time but the acceleration remains zero.

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It is more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity because of static friction.

Static friction refers to the resistance encountered when attempting to initiate the movement of two objects that are in contact with each other but not currently in motion relative to each other. When an object is at rest, the force of static friction acts in the opposite direction to any force applied to it.

In this case, the force applied to the carton is the force needed to start moving it from rest. The force of static friction is greater than the force applied to the carton, making it difficult to start moving the carton from rest.

Once the carton is moving with constant velocity, the force of static friction is no longer acting on it. The only force acting on the carton is the force that is applied to keep it moving at a constant velocity. This force is equal to the force of kinetic friction which is less than the force of static friction.

To summarize, the initial effort required to overcome the static friction between a heavy carton and its resting position is greater compared to the continuous force needed to maintain its constant velocity. The force of static friction is greater than the force applied to the carton, making it difficult to start moving the carton from rest.

Once the carton is moving with constant velocity, the force of static friction is no longer acting on it, and the only force acting on the carton is the force that is applied to keep it moving at a constant velocity.

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Many electrical appliances and circuits are earthed in order to prevent electrocution.

Electrocution is defined as the outcome of an electric shock that occurs when electric current with high voltage passes through the body of a living organism.

The clinical manifestations of electrocution include the following:

When electrical appliances and circuits are constructed, a pathway for a faulty current to flow to the earth is mare to prevent electric shock which may lead to an electrocution.

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An experience that forces an individual to confront an existential issue is known as a boundary situation in this type of context.

This type of situation is characterized by negative consequences which the individual tries to escape from in an unfruitful attempt. It usually makes the individual feel like it can't be overcome and is also likely to enter deep into the crisis.

This experience forces an individual to confront an existential issue so as to prevent it from escalating into a very difficult position and to promptly address the situation through employing different types of techniques. This ensures that a reoccurence doesn't come up in this type of situation.

This is therefore the reason why boundary situation was chosen as the most appropriate choice.

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By using the blackbody radiation formula, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

We need to know about black body radiation to solve this problem. The energy radiated by a black body object is proportional to the area and the fourth power of temperature. It can be determined as

P = A . e . σ . T⁴

where P is power, A is surface area, e is emissivity, σ is Stefan Boltzmann's constant ( 5.67 x 10¯⁸ W/m²K⁴) and T is temperature.

From the question above, we know that

P1 = 10 watt

P2 = 100 watt

T1 = T1

By using the black body radiation formula, the ratio of temperature is

T1⁴ / T2⁴ = P1 / P2

Hence,

T1⁴ / T2⁴ = P1 / P2

T1⁴ / T2⁴ = 10 / 100

T1⁴ / T2⁴ = 1 / 10

T2⁴ = 10T1⁴

T2 = ⁴√(10T1⁴)

T2 = T1 x 10⁰'²⁵

Thus, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

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Part A

The sound generated moves back and forth in simple harmonic motion. The formula for calculating maximum speed, vmax is expressed as

vmax = wA

where

w is the angular velocity

A is the amplitude

Recall,

w = 2 x pi x frequency

Thus,

vmax = 2 x pi x frequency x amplitude

From the information given,

frequency = 1.6KHz

We would convert from KHz to Hz

Recall,

1 KHz = 1 x 10^3 Hz

1.6 KHz = 1.6 x 10^3 Hz

amplitude = 2.5 μm

we would convert μm to m

Recall,

1 μm = 1 x 10^-6 m

2.5 μm = 2.5 x 10^-6 m

pi = 3.14

By substituting these values into the formula, we have

vmax = 2 x 3.14 x 1.6 x 10^3 x 2.5 x 10^-6

vmax = 0.025 m/s

Part B

The formula for calculating maximum acceleration, Amax is

Amax = w^2A

where

a = amplitude

Amax = (2 x pi x frequency)^2A

Amax = (2 x 3.14 x 1.6 x 10^3)^2 x 2.5 x 10^-6

Amax = 252.4 m/s^2

The Kelvin scale is known as the absolute scale. The lowest temperature in Kelvin is the temperature 0 (there is no negative temperature in Kelvin).

The conversion from Kelvin to Fahrenheit is given by the formula below:

Using K = 0 in this formula, we have:

So the lowest temperature in Fahrenheit is -459.67 °F.

Answer:

187.5

Explanation:

Answer:

The dependent variable

Explanation:

This is because this variable depends on what happens during the experiment.

The statements are as follows:
1. If μ is increased to 4.0, the power of the test will increase.
2. If the power of the test is increased to 0.90, μ must be greater than 3.5.



1. True. The power of a test increases as the difference between the null hypothesis and the true population parameter (in this case, μ) increases. Therefore, if μ is increased from 3.5 to 4.0, the power of the test will increase as well.

2. False. The power of a test depends on several factors, including the sample size, the level of significance, and the effect size (i.e., the difference between the null hypothesis and the true population parameter). Therefore, it is possible to increase the power of the test without increasing μ. This could be done by increasing the sample size, decreasing the level of significance, or increasing the effect size through other means.

the first statement is true and the second statement is false.


The power of a test is the probability that the test correctly rejects the null hypothesis when the alternative hypothesis is true. In this case, the power of the test is given as 0.80 when the population mean (μ) is 3.5. This means that there is an 80% chance that the test will correctly reject the null hypothesis when the true population mean is 3.5.


The statement "A test has power 0.80 when μ = 3.5" is true, as it indicates the probability of correctly rejecting the null hypothesis when the true population mean is 3.5.

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Only it's volume changes. Volume is defined as the space an object takes up. The amount of substance, which is the mass stays the exact same. The amount of force that Earth is pulling the car down (the weight) stays the same.

Answer:

Explanation:

The main cause of different parts of the earth receiving different amounts of solar energy is as a result of the tilt of the Earth. Having different latitudes also play a role in that, as latitudes are used to measure the distances between places on earth(together with longitude) receiving different amounts of solar energy also leads to having different atmospheric circulation. Making some places have more heat, while other places have lesser heat energies. Logically, the areas with higher presence of solar energy are going to be hotter than places with lesser presence of solar energy.

The speed of the man with respect to a passenger sitting at rest in the train is 17 m/s in the opposite direction of the train's motion.

The speed of the man with respect to a passenger sitting at rest in the train can be calculated using the concept of relative velocity.

Relative velocity is the velocity of an object with respect to another object.

In this case, the velocity of the man with respect to the track is 14 m/s and the velocity of the train with respect to the track is 31 m/s.

To find the velocity of the man with respect to the passenger sitting at rest in the train, we can use the formula:

Where Vmp is the velocity of the man with respect to the passenger, Vmt is the velocity of the man with respect to the track, and Vpt is the velocity of the passenger with respect to the track.

Plugging in the given values, we get:

Vmp = 14 m/s - 31 m/s

Vmp = -17 m/s

Therefore, the speed of the man with respect to a passenger sitting at rest in the train is 17 m/s in the opposite direction of the train's motion.

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