Using the periodic table of the elements, how many valence electrons would helium have?
A. 0
B. 1
C. 2
D. 8

This problem can be answered using the equation below:

c = frequency x wavelength

where: c is the speed of light, which is equal to 3.00 x 10^8 m / s 

frequency = c / wavelength 
= (3.00 x 10^8m /s) / (2.40 x 10^-5 cm x 1 m /100cm)

= (3.00 x 10^8 m/s) / 2.40 x 10^-7m 

= 1.25 x 10^15/s 1 / s = 1Hz 

Frequency = 1.25 x 10^15Hz

Answer:

false

Explanation:

Work may be done in positive or negative direction. When a work is done in positive direction, it is called useful work, when work is done in negative direction, it is known as useless work. Any energy associated with friction produces useless work. That is, the work is done in negative direction.

Therefore, thermal energy produced by friction can be used to do work but in negative direction.

The correct option is false.

Answer: The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun. And it's not alone in dwarfing Earth's dominant star.

Explanation:

The force that will make this into equilibrium would be equal to the force of equal amount yet applied on the opposite direction.

So we are given that a force of 55 N due west was applied, so the equilibrium force would be 55 N due east.

Final answer:

To achieve equilibrium against a 55 N force acting due west, a single equal and opposite force of 55 N must be applied due east. In various scenarios, the equilibrium force must have the same magnitude but opposite direction to the acting force. Pythagorean theorem helps calculate net force when forces are perpendicular.

Explanation:

For an object to be in equilibrium, the net force acting on it must be zero. This means that to counteract a force of 55 N acting due west, an equal and opposite force must be applied. The single force that would produce equilibrium in this case is a 55 N force acting due east.

Applying this principle, we can understand the scenarios presented:

Lastly, a charge in an electric field experiencing a net force of 100 N eastward when the field points north is impossible, since the electric force on a charge by a field is in the direction of the field. Therefore, the force must be perpendicular to the direction of the electric field strength of 50 N/C pointing north.

Astronauts orbiting earth experience a fraction smaller gravitational force (Fgrav) as compared to the force on Earth's surface. They are in a state of continuous freefall which gives the impression of weightlessness, not because gravity is absent.

The force experienced by astronauts orbiting the Earth, notably, is actually a fraction smaller than the gravitational force (Fgrav) experienced on Earth's surface. However, it is a common misunderstanding that astronauts in orbit experience zero gravity. Though it might appear they are weightless and therefore not subject to gravity, this is not the case. They are in a state of continuous freefall towards the Earth. The sensation of weightlessness is because they're in freefall, not because gravity is absent. The effect of gravity diminishes as distance from the Earth increases, hence why the gravitational force is a fraction smaller.

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Final answer:

To multiply an input force in a hydraulic system, the input end should have a smaller area. This allows for a larger output force through Pascal's law, which is a principle used in hydraulic systems to provide a mechanical advantage.

Explanation:

To multiply an input force in a hydraulic system, the input end should be the one having the smaller area. When a force is applied to a small area, the resulting pressure is transmitted through the hydraulic fluid to a larger area on the output end, resulting in a greater output force. This principle is based on Pascal's law, which states that pressure in an enclosed fluid is transmitted undiminished in all directions.

Your hydraulic system will give you a mechanical advantage by applying the input force on a smaller area to output a greater force on a larger area. For example, applying a 100-N force on the smaller input piston can produce a 500-N force on the output piston if the output piston is five times larger in area.

Hydraulic systems are often compared to simple levers, but have the benefit that they can transmit forces through complex paths, allowing diverse applications from brakes in vehicles to heavy lifting in industrial settings.

Answer:  13.3 m

I got it right on Acellus

Answer:

The standard unit used to measure of mass is gram.

(2) is correct option.

Explanation:

S.I is the standard international system of unit.

The S.I unit of mass is kilogram.

1 kg = 1000 gm

So, We can say that,

The standard unit used to measure mass is gram.

Cubic meter is the unit of volume.

Liter is the unit of water.

Meter is the unit of length.

Hence,  The standard unit used to measure of mass is gram.

It measures 7,926 miles (ca. 12,756 km) in diameter (the distance from one side to the other via the centre of the Earth) (about 12,756 kilometres). When the diameter of Earth is calculated between the North and South Poles, it is somewhat smaller at 7,907 miles (ca. 12,725 km).

Joseph Louis Lagrange, a mathematician, developed the so-called Lagrangian points, one of which is L2. Lagrangian's points are places in space where the interaction between a body's orbital motion and gravity forces is balanced. As a result, spaceships can use them to “hover.”

Therefore, The gravity at the equator would be zero if the earth were roughly 36,000 km in circumference, the same mass, and the same length of day. This is where geostationary orbits are located.

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Final answer:

To find the point where the Earth's gravitational acceleration is 1/40 of the surface value, we use Newton's law of gravitation and solve for r', yielding a distance of approximately 40225 km from the Earth's center.

Explanation:

To determine the distance from the Earth's center to a point where the gravitational acceleration is 1/40 of its value at the Earth's surface, we can use the law of universal gravitation. The force of gravity according to Newton's law of gravitation is given by F = GMm/r², where G is the gravitational constant, M is the mass of the Earth, m is the mass of the object, and r is the distance from the center of the Earth.

The gravitational acceleration g at the surface of the Earth is g = GM/r². If we want to find the point where this acceleration is 1/40 of its surface value g0, we set g = g0/40, which leads to GM/(r')² = GM/(R² * 40), where R is the radius of the Earth and r' is the new distance from the Earth's center. Solving for r', we get r' = R * √40. Using the mean radius of the Earth R ≈ 6371 km, we find:

r' ≈ 6371 * √40 km ≈ 6371 * 6.32 km ≈ 40225 km.

This means the distance from the Earth's center to the point where gravitational acceleration is 1/40 of its surface value is approximately 40225 km.

The momentum of the large rock that has a mass of 50kg and is rolling downhill at 3 m/s is 150kgm/s.

HOW TO CALCULATE MOMENTUM:

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Answer:

The correct answer is A)practicing dentist

Explanation:

Hello!

Let's solve this!

The American Dental Association (ADA) is an association of practicing dentists. They are dedicated to promoting dental health and giving assistance to those who need it.

They also give recommendations and talks about oral health.

The correct answer is A)practicing dentist

The acceleration of a freely falling object is 20 m/s if the distant planet, a freely falling object gains speed at a steady rate of 20 m/s during each second of fall.

It is defined as the rate of change in linear velocity with respect to time. It is also known as linear acceleration.

It is given that:

on a distant planet, a freely falling object gains speed at a steady rate of 20 m/s during each second of fall.

As we know, from the acceleration the rate of change in linear velocity with respect to time. It is also known as linear acceleration.

The acceleration of an item is the amount of speed it gets or loses per second when only its speed is changing and not its direction.

Thus, the acceleration of a freely falling object is 20 m/s if the distant planet, a freely falling object gains speed at a steady rate of 20 m/s during each second of fall.

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Answer:

Acceleration is given by the formula :

a = (v - u)/t

a is the acceleration , u is the initial velocity , v is the final velocity , t is the time in seconds

Final answer:

Scenario C correctly describes resonance, where a pipe open at both ends has a length equal to half the wavelength of the sound from the tuning fork, allowing for a standing wave and resonant sound.

Explanation:

The scenario that accurately describes a condition in which resonance can occur is scenario C: A pipe's length is equal to 1 ⁄ 2 of the wavelength of the sound waves produced by a tuning fork vibrating over one end of the pipe that's open at both ends. In this case, the half-wavelength of the sound matches the length of the pipe, allowing a standing wave to be set up with antinodes at both ends and a node in the middle. This results in constructive interference and a resonant amplification of the sound.