Which statement describes an action-reaction pair?
A. You push against a wall, and the wall applies a force to your
hands.
B. The Sun pulls on the Earth, and the Earth pulls on the Moon.
C. You push a book off the edge of a shelf, and the book falls to the
floor
G
D. You throw a ball straight up, and Earth's gravity pulls it downward.

The kinetic energy of the electrons accelerated through a potential difference of 84.0 kV is approximately 1.344 x 10^-14 joules.

In an electron microscope, electrons are accelerated through a potential difference to increase their kinetic energy before they are used for imaging or analysis. The potential difference applied to accelerate the electrons is given as 84.0 kV, which stands for 84.0 kilovolts.

To calculate the electrons' kinetic energy, we can use the equation:

Kinetic energy (KE) = qV

Where:

q is the charge of an electron (approximately 1.6 x 10^-19 coulombs)

V is the potential difference in volts

Let's calculate the kinetic energy:

KE = (1.6 x 10^-19 C) * (84.0 x 10^3 V)

KE = 1.344 x 10^-14 joules

Therefore, the kinetic energy of the electrons accelerated through a potential difference of 84.0 kV is approximately 1.344 x 10^-14 joules.

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The acceleration of the elevator at this time was 2m/s² and the elevator was accelerating the upward direction.

The mass of the child standing on a spring scale in an elevator is 30 kg the elevator is showing a reading of 360 Newtons.

The reading note by the elevator is given by radiation,

W = M(g+a)

Where w is the reading of the spring scale,

M is the mass of the child,

g is the gravitational acceleration which is given to be 10m/s² and a is the acceleration of the elevator.

Putting values,

360 = 30(10+a)

12 = 10+a

a = 2m/s²

As you can see from the above result that the acceleration of the lift is 2m/s² and because it is positive it means that the elevator is accelerating in the upward direction.

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The number of  atoms of chromium in the sample is 1.2 x 10²⁴ atoms.

The number of atoms of chromium in the sample is calculated by applying the following method.

The given compound;

= K₂Cr₂O₇

The atoms of oxygen in the sample = 4.2 x 10²⁴

Based on the principle of simple multiple ratio or law of simple proportions, the number of f atoms of chromium in the sample is calculated  as;

Cr = 2 molecules

O = 7 molecules

7 = 4.2 x 10²⁴ atoms

2 = ?

= (2 x 4.2 x 10²⁴ ) / 7

= 1.2 x 10²⁴ atoms

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The answer is 6*10^4 V or 60,000 V.

The potential at a point due to two charges can be calculated using the formula:

\(V = k * (q1/r1 + q2/r2)\)

Where k is the Coulomb constant \((9 x 10^9 Nm^2/C^2)\), q1 and q2 are the charges, and r1 and r2 are the distances between the point and the charges.

In this case, the charges are 10 μC each and are located at (0, 3m) and (3m, 0), respectively. The distance between each charge and the point at the origin (0, 0) is:

\(r1 = √(x1^2 + y1^2) = 3mr2 = √(x2^2 + y2^2) = 3m\)
Therefore, the potential at the origin due to these charges is:
\(V = (9 x 10^9 Nm^2/C^2) * [(10 μC/3m) + (10 μC/3m)]V = 6 x 10^4 V\)

Therefore, the answer is 6*10^4 V or 60,000 V.

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The change in velocity of the baseball is 39.72 m/s

This is the difference between the final and the initial velocity of a body.

To calculate the change in velocity of the ball, we use the formula below.

Where:

Make Δv the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, The change in velocity of the baseball is 39.72 m/s

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Free body diagram:

Here, T_1 is the tension in the left cable (T_1=30000 N; given), T_2 is the tension in the right cable, W is the weight of the tram.

The force equation in horizontal direction is given as,

Therefore, the tension in right cable T_2 is given as,

Substituting all known values,

The force equation in the vertical direction is given as,

Substituting all known values,

Therefore, the weight of the tram is 8038.47 N.

The new g = 3.16 m/s².

11 oscillations in 18.5 s

The duration of an oscillation is referred to as the time period.

T = 18.5 / 11 = 1.68 s

mass, m = 200 g = 0.20 kg

Δx = 22.8 cm = 0.228 m

ω = 2π / T = (2 x 3.14) / 1.68 = 3.73 rad/s

\(\omega =\sqrt{\frac{K}{m}}\)

Where, K is the spring constant

K = ω² m = 3.73 x 3.73 x 0.20 = 2.78 N/m

Now, mg = K Δx

0.20 x g =2.78 x 0.228

g = 3.16 m/s²

A sine wave—a wave with everlasting motion like the side-to-side swing of a pendulum or the up-and-down action of a spring with a weight—is an example of an oscillation. An oscillation is a periodic motion that repeats itself in a regular cycle. Around an equilibrium point or mean value, an oscillating movement takes place.

Free, damped, and forced oscillation are the three basic types of oscillation. A body is said to be oscillating freely when it vibrates at its own frequency.

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Answer:

for question 5 its

Explanation:

Through Brahe's astronomical measurements and Kepler's own drawings of the geometrical relationship between the Sun and Mars in various parts of the planet's orbit, Kepler discovered that planets moved faster when they were closer to the Sun.

The critical angle is 76.7°

The value of this critical angle is given by where n2 is the refractive index of the second medium and n1 is the refractive index of the first medium. When light travels from a medium with a higher refractive index to a medium with a lower refractive index, the critical angle is the angle of incidence above which light is only reflected (no refraction occurs).

The critical angle in this problem is given by because the first medium in it is glass and the second one is oil.

critical angle = arc sin (1.46/ 1.50 )

critical angle = arc sin ( 0.973 )

critical angle = 76.7°

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The electron configuration of a ground-state Be atom is 1s² 2s². Each electron in the atom is described by a set of quantum numbers, including:

Principal quantum number (n): The first electron has n = 1 and the second electron has n = 2.

Azimuthal quantum number (l): For n = 1, the only possible value of l is 0 (s orbital), and for n = 2, the possible values of l are 0 (s orbital) and 1 (p orbital). Therefore, the first electron has l = 0 and the second electron has l = 0 or l = 1.

Magnetic quantum number (m): For l = 0, the only possible value of m is 0, and for l = 1, the possible values of m are -1, 0, and 1. Therefore, the first electron has m = 0, and the second electron has m = -1, 0, or 1.

Spin quantum number (s): Each electron has s = +1/2 or -1/2.

Thus, the set of quantum numbers for each electron in a ground-state Be atom is:

Electron 1: n = 1, l = 0, m = 0, s = +1/2 or -1/2

Electron 2: n = 2, l = 0 or 1, m = -1, 0, or 1, s = +1/2 or -1/2

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Some dishwashing machines require a booster heater because they need water at a high temperature to effectively clean dishes.

The booster heater raises the temperature of the water to the required level, usually around 180-195 degrees Fahrenheit, to properly sanitize and remove any food particles or bacteria. This is especially important for commercial dishwashers that need to meet health and safety standards. Additionally, some machines may have low incoming water temperatures, so a booster heater is necessary to bring the water up to the required temperature. The temperature requirement is typically set by local health codes and regulations.

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\((R_1 +R_2)||R_3\\\\R_{eq} = \left(\dfrac 1{R_1 + R_2} + \dfrac 1{R_3}} \right)^{-1}\\\\\\~~~~~~=\left( \dfrac{1}{100+200} + \dfrac 1{600} \right)^{-1}\\\\\\~~~~~~=\left( \dfrac{1}{300} + \dfrac{1}{600} \right)^{-1}\\\\\\~~~~~~=\left(\dfrac{3}{600} \right)^{-1}\\\\\\~~~~~~=\dfrac{600}3 \\\\\\~~~~~~= 200~ \Omega\)

Answer:

Yes

Explanation:

Dendrites bring electrical signals to the cell body and axons take information away from the cell body.

Electricity is the \(\sf{\underline{flow}}\) of electrons, because electrons \(\sf{\underline{passes}}\)  from atom to atom.

Switches made out of semiconductors made computers possible, but lately, when it comes to high tech, there's a new family on the block, the "rare earth elements," which are 15 elements located near the bottom of the periodic table.

These elements play a crucial role in modern technologies and have unique properties that make them essential for various applications. It's worth noting that rare earth elements are not typically used to make switches, but rather they are used in a variety of high-tech applications, including electronics, magnets, batteries, and more. While semiconductors made of silicon are still widely used in computer technology, rare earth elements have become increasingly important in a variety of high-tech applications due to their unique magnetic and optical properties. They are used in products such as wind turbines, electric vehicles, smartphones, and more.

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After seeing variations in the fossils as they moved from oldest to youngest sedimentary rocks, geologists came up with the geologic time scale.

However, the primary method for determining a geologic time scale is through the fossil forms found in rocks. The timing of the presence and disappearance of widespread species from the fossil record is used to designate the origins and ends of ages, epochs, eras, and other intervals.

After seeing variations in the fossils as they moved from oldest to youngest sedimentary rocks, geologists came up with the geologic time scale. Relative dating was used to divide Earth's history into periods when similar creatures were present.

Fossil assemblages found in strata are particular to the period in which they lived and can be used to compare rocks of the same age spread across a large geographic area.

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Answer:

a)  True    b)  True

Explanation:

a) a capacitor is made up of two flat plates and each one has a charge of the same sign, therefore the statement is true

b) the current is the flow of electrons per unit of time, therefore the charge is not zero, therefore the statement is True

Answer:

True

Explanation:

Answer:

Newton's first law of motion states that objects state of rest or uniform motion will stay unless acted upon by an external force

Explanation:

Newton's first law of motion is also called the Law of Inertia. Because, it describes the property of inertia of the body. Newton's First Law states that every object continues its state of rest or uniform motion, until or unless it is acted upon by an external force. It means that if an object is in state of rest, it will remain at rest until or unless an external force is not applied to it. Same goes for the state of uniform motion. Hence, the answer will be:

Newton's first law of motion states that objects state of rest or uniform motion will stay unless acted upon by an external force

Answer: Newton's first law of motion states that objects at rest or in motion will stay unless acted upon by a net external force.

Explanation:

Motion is typically described in terms of velocity, acceleration, displacement and time. An object's velocity cannot change unless it is acted upon by a force, as described by Newton's first law also known as inertia. More generally, the term motion signifies any spatial and or temporal change in a physical system.

Many scientists have studied motion and it's properties because of its importance to life. The Italian, Galileo Galile, who lived from 1564 to 1642, did the first systematic study of motion. Also Sir Issac Newton did more detailed work on the study of motion. In his works in motion he came about three different laws.

- Newton's first law: This states that objects at rest or in motion will stay unless acted upon by a net external force.

-- Newton's second law: This states that the force on an object is equal to its mass times its acceleration.

- Newton's third law: This states that for every action there is an equal and opposite reaction.

Answer:

What do you want to know?

Explanation:

The time frame and scale of a landslide can vary greatly, and it's necessary to have more specific information to give a more precise answer.

The time frame of a landslide can vary widely depending on the circumstances. Some landslides can occur suddenly and quickly, while others can happen gradually over a longer period of time. Therefore, it's difficult to provide a general answer without more information about the specific landslide in question. Similarly, the scale of the area affected by a landslide can also vary widely, ranging from small localized events to large-scale disasters that affect entire communities or regions. Once again, the size of the area affected by a landslide depends on many factors, including the type of landslide.

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The downward force of the atmosphere on the book is equal to the pressure of the atmosphere multiplied by the surface area of the book's cover and it is calculated to be 5 N.

Atmospheric pressure is the pressure exerted by the weight of the Earth's atmosphere on objects on or near the surface of the Earth. It is caused by the gravitational attraction of the Earth on the gases in the atmosphere. The atmospheric pressure varies with altitude, temperature, and weather conditions, and is typically measured in units of pressure such as pascals (Pa) or kilopascals (kPa).

Force = Pressure x Area

Where:

Pressure = 100 kPa (given)

Area = 0.05 m² (given)

Substituting the given values, we get:

Force = 100 kPa x 0.05 m²

Force = 5 N

Therefore, the downward force of the atmosphere on the book is 5 N.

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Answer:

In physics, resistive force is a force, or the vector sum of numerous forces, whose direction is opposite to the motion of a body, and may refer to: Friction, during sliding and/or rolling.

A 7.80-g bullet moving at 575 m/s penetrates a tree trunk to a depth of 5.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.

Explanation:

Only the first and fourth equations are balanced, while the second and third equations are not balanced.

To determine if the nuclear equations are balanced, we need to check if the total number of protons (positive charges) and the total mass number (sum of protons and neutrons) are the same on both sides of the equation.

Let's analyze each equation:

141 235U + 1n → 92 41Ba + 3 56Kr + 3 0n

The equation is balanced since the total number of protons (92 + 1) and the total mass number (235 + 1) are the same on both sides.

144 90Zr + 1 2n → 92 52Te + 3 0n

The equation is not balanced since the total number of protons (90 + 2) and the total mass number (144 + 2) are not the same on both sides.

235 92U + 1 3n → 7139Kr + 94 40Zr + 1 3n

The equation is not balanced since the total number of protons (92 + 3) and the total mass number (235 + 3) are not the same on both sides.

92 235U + 2 1n → 52 92Kr + 2 1n

The equation is balanced since the total number of protons (92 + 2) and the total mass number (235 + 2) are the same on both sides.

Only the first and fourth equations are balanced, while the second and third equations are not balanced.

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Answer:

Jethro Wood is the one who designed the one-piece wrought iron plow.

Option A is correct. The resultant quantity is 50m/s to the right.

Vector quantities are quantities that have both magnitude and direction.

From the diagram shown,  we can see that 100m/s vector moves in the positive x-direction, this means that the  of magnitude the vector is +100m/s.

For the vector 50m/s, we can see that it is moving in the negative x-direction, this shows that the magnitude of the 50m/s vector is -50m/s.

Resultant speed = +100 - 50

Resultant speed = +50m/s

Since the resultant speed is a positive value, this mean that the resultant quantity will be moving towards the right.

Hence the correct option will be 50m/s to the right.

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