You keep a chalkboard eraser pressed against the chalkboard by using your finger to exert a horizontal force on the back of the eraser.
Which type of force (call it force A) keeps the eraser from falling?
Normal force
Kinetic friction
Gravitational force
Static friction

Answer:

mass = 0.14kg

Explanation:

kinetic energy (K.E.) = ( m / 2 ) v^2

where,

m = mass ( kg )

K.E. = kinetic energy ( J )

v = velocity ( m / s )

note that the question does not have a velocity factor in it

but, we are just going to use the speed parameter for velocity since they have the same units ( m / s )

from our question,

m = unknown ( but for solution purposes, we will just call it x)

K.E = 3.10J

v = 6.70 m / s

from our formula,

we substitute our values to have;

3.10 = ( x / 2 ) 6.70^2

3.10 = ( x / 2 ) 44.89

when we open the bracket, 44.98 will multiply with x to give

3.10 = 44.89x / 2

we cross multiply to give us

44.89x = 3.10 ( 2 )

44.89x = 6.20

divide through by 44.89 to give us,

44.89x / 44.89 = 6.20 / 44.89

x = 0.14kg

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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The potential difference between the plates of the parallel-plate capacitor needs to change at a rate of 0.696 V/s to produce a displacement current of 1.6 A.

The required rate of change is calculated by using the formula for displacement current in a parallel-plate capacitor :

where I_d is the displacement current, ε₀ is the vacuum permittivity (8.85 x 10^(-12) F/m), A is the area of the plates, and dV/dt is the rate of change of the potential difference.

Rearranging the formula, we can solve for dV/dt:

Given that the capacitance C = ε₀ * A / d, where d is the separation between the plates, we rewrite the formula as:

Substituting the given values, with C = 2.3 x 10^(-6) F and I_d = 1.6 A, we have:

Calculating the result gives:

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a) The time taken is 4.44 s

b) The force that keeps it moving is 15188 N

c) The centripetal force is responsible for the motion in the circular path.

d) The coefficient of the friction is 1.03

The centripetal force is the force that keep the object moving in a circular path. In this case, we need to find the how long does it take the car to do a lap around the track.

a) The time that is taken is the radio of the distance to the speed of the object. Thus the time that is taken =  200 m/45 m/s = 4.44 s

b) The net force that acts on the car as it is negotiating the circular path is given as; mv^2/r = 1500 * (45)^2/200

= 15188 N

c) The centripetal force keeps the car on the circular path

d) The coefficient of static friction is; 15188 N/1500 kg * 9.8 m/s^2

= 1.033

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Answer:

A. 3,000,000 m

B. 0.25 km

C. 10 m

D. 1,000 cm

Explanation:

no hablo español, así que solo ingrese esto en el traductor de G*ogle

A. One kilometer equals 1000 meters, so

3,000*1,000 = 3,000,000 m

B. One meter equals 0.001 kilometer, so

250*0.001 = 0.25 km

C. One centimeter equals 0.01 meter

1,000*0.01 = 10 m

D. One milimeter equals 0.1 centimer, so

10,000*0.1 = 1,000

Answer:

Yes.

Explanation:

The potential energy of the object is 300 J

The potential energy is the energy that is stored in the object that depends on the relative position of various parts of the system. The potential energy is calculated by the mass and the height of the object.

This energy is the product of mass, gravitational acceleration and height of the object.

Given,

Mass = 10 g

g = 10

height = 3 m

Potential energy = m*g*h

Potential energy = 10 * 10 * 3

Potential energy = 300 J

Therefore the potential energy of the object having mass 10 kg and height 3m is given to be 300 J.

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2Ag + H₂S ⇒ Ag₂S + H₂

Ag ⇒ Ag⁺

Silver atoms loose electrons to sulfur atoms.

Answer:

Option D

Explanation:

The reaction is given by

In the reaction

silver loses two electrons to sulfur in atoms inorder to attain Ag²+ structure .

As loss of electron is oxidation it's redox reaction

Answer:

150,000N

Explanation:

Force=Mass*Acceleration

F=ma

Mass of the rocket=1000Kg

Acceleration=150 m/s²

Force=1000*150=150,000kgm/s²=150,000N

Answer:

Diffusion of water, salts, and waste products occurs in the kidneys. Diffusion of calcium from food into cells occurs in the intestines. Molecules are not the only things that can diffuse. Heat from the body diffuses away in the form of sweat that evaporates.

Explanation:

plz follow me

The system of forces that would make the object not to move is shown in  option A.

We know that a force is a vector. A vector is a quantity that does have both magnitude and direction. This implies that we would know the direction in which the vector would move by looking at the direction that is indicated.

A force could have direction because force is a vector quantity. We know that an object is going to remain at rest if the object is acted upon by balanced forces. According to the Newton's first law, the only time that an object would move is if the object has been acted upon by external forces.

We now have to look at the horizontal forces that act on the object. The image that shows horizontal forces of the same magnitude in both directions would not make the object to move.

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Water: The motion of the water molecules initially decreased when the ice cubes were added to the water bottle, which caused the water to become cold.

As time passed during the hike, the motion of the water molecules may have increased due to exposure to higher temperatures and agitation during transport.

Ice: The ice cubes initially had a low motion of molecules due to being frozen solid. As time passed during the hike and the ice cubes were exposed to higher temperatures, their molecules began to gain more motion, causing the ice to melt.

Beans: The motion of the molecules in the beans increased as the pot was placed over the fire and heated. This caused the beans to become hot and cooked.

Hot dog: The motion of the molecules in the hot dog increased as it was heated over the fire. This caused the hot dog to become hot and cooked.

Lastly, Hot Chocolate: The motion of the molecules in the hot chocolate initially decreased as it cooled to room temperature. When Carly drank the cold hot chocolate, the motion of the molecules in her mouth may have increased due to the temperature difference, providing a warming sensation.

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Answer:The controlled variable is the one that you keep constant. The responding variable or variables is what happens as a result of the experiment

Explanation:Mark me brainly please

Answer:

Kinetic energy is the energy that an object has because of its motion. The molecules in a substance have a range of kinetic energies because they don't all move at the same speed. As a subtance absorbs heat the particles move faster so the average kinetic energy and therefore the temperature increases.

Answer:

C is the correct answer.

Explanation:

we have given about light and we have to compare the speed of light in air as well as in glass. So let's take the expression of refractive index of glass. Suppose we are representing a refractive index of glass with respect to air. So this will be equal to the fraction or the ratio of the speed of light in air divided by the speed of light in glass. Hence we get the expression in the modified form as speed of light in glass is equal to speed of light in air, divided by the refractive index of glass with respect to air. So obviously when we consider the refractive index of class with respect to air, it is a number which is more than one. Hence from equation number A we get that the speed of light in glass will be less than that speed of light in air. Hence we can get it the correct answer. As the choice number C means the answer is less. This is our final answer.

Thank you.

Answer:

It is d

Explanation:

Answer:

D !!!!!

Explanation:

Answer:

The S&P 500 and the S&P 1000 represent different stock market indices, with the S&P 500 consisting of 500 large-cap U.S. companies, while the S&P 1000 includes 1,000 mid-cap and small-cap U.S. companies.

The S&P 500 and the S&P 1000 are stock market indices used to track the performance of various segments of the U.S. stock market. The S&P 500 represents a broader index comprising 500 large-cap companies.

These companies are generally recognized as industry leaders and have a significant market capitalization. On the other hand, the S&P 1000 is a narrower index that includes 1,000 mid-cap and small-cap companies.

These companies tend to have a smaller market capitalization compared to those in the S&P 500. The S&P 1000 provides investors with exposure to a wider range of companies, including smaller and potentially faster-growing companies.

Both indices serve as benchmarks for investors and are used to assess the overall performance of different segments of the U.S. stock market.

Therefore, the S&P 500 comprises 500 major U.S. companies, whereas the S&P 1000 includes 1,000 mid-cap and small-cap U.S. companies. They are distinct stock market indices with varying compositions and represent different segments of the market.

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Answer:

There are little tiny batteries that are contained within the molecules of the food. The sun charges these batteries, and when the food is eaten, the energy from the batteries flows through the acids in the stomach, which gives the person or animal energy. In gasoline, the energy is created when the gasoline is set on fire and burned, there is no energy within it already. So they are different forms of energy. Hope this helps!

Answer: 1000 Hz · 0,5 m = 500 m/s

Explanation: speed = frequency · wavelength

Gas X, when held in a sealed chamber at STP, will have an approximate volume of 22.4 L.

At STP (Standard Temperature and Pressure), which is defined as 0 degrees Celsius (273.15 Kelvin) and 1 atmosphere of pressure, one mole of any ideal gas occupies a volume of 22.4 liters. This is known as the molar volume of a gas. It is a constant value that allows us to easily calculate the volume of a given amount of gas at STP.

The molar volume of 22.4 liters can be derived from the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature. At STP, the pressure is 1 atmosphere, and if we assume we have one mole of Gas X, we can rearrange the equation to solve for V:

V = (nRT) / P

Substituting the values for STP (n = 1 mole, R = 0.0821 L·atm/mol·K, P = 1 atm, T = 273.15 K) into the equation, we get:

V = (1 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm

 = 22.4 L

Therefore, the approximate volume of Gas X in a sealed chamber at STP is 22.4 L.

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Answer:

Home run

Explanation:

i play

Answer:

1. option a

2. option d

Explanation:

HOPE IT HELPS YOU

Answer:

"solve: given that F -12 N and time 4 seconds and let we have to find out the P.

F = 12 N

t = 4 s

p = ?

F = m×( v - u ) / t

12 = m×v / 4

m×v = 12× 4

p = 48 kg m/s

Linear momentum will be 48 kg m/s.

Explanation:

Answer:

evaporation

Explanation:

changes form liquid to gas is called evaporation

Answer: Evaporation

Explanation:

When a neuron is in the resting potential state, the neuron is negatively charged on the inside and positively charged on the outside.

When a neuron is not actively responding to an electrical input, which is commonly accepted to be when it is in its resting state, there is widespread consensus that the neuron is in its resting state. The charge on the neuron's inner membrane is now higher than the charge on the neuron's outer membrane. Because of the selective permeability of the cell membrane, the various ion concentrations on either side of the membrane are unable to get balanced with one another.

When the membrane is in its resting state, it is permeable to the passage of potassium ions (K⁺). In the same way as chloride (Cl⁻) ions find it difficult to move through a resting state, sodium (Na⁺) ions also find it difficult to do so. There is a membrane that stops negatively charged proteins with an anion difference of one (A⁻) from passing into neighboring neurons.

A pump is also present in the neuronal cell membrane, and this pump requires energy in order to remove three ions of sodium for every two ions of potassium that enter the cell. A neuron's resting potential can be defined as the voltage difference that exists between the neuron's interior and its outside in the absence of any external influences.

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Answer: B, Science can be used to predict the effects if the dam on wildlife.

Explanation:

Ur welcome :)

Answer:

The answer is -0.5m/s2

Explanation:

I did the test and got it right.

The magnitude of the acceleration of the dog is ​0.5 m/s².

Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions. Acceleration is a vector quantity since it has both a magnitude and a direction.

Initial speed of the dog = 7.5 m/s

Final speed of the dog = 0 m/s

Time taken = 15 second

Hence acceleration of the dog = change in speed/ time interval

= (final speed - initial speed)/time interval

= ( 0 m/s - 7.5 m/s)/15 second

= - 0.5 m/s²

Hence, the magnitude of the acceleration of the dog is ​0.5 m/s².

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