A student pushes a 50-N box across the floor a distance of 15 m. How much work was done to move the box?
1) 750 j
2) 75 J
3) no work was done
4) 7500 J

Answer:

a) 20.65kg

b)4.7rad

Explanation:

Answer:

Speed is a scalar quantity, that is, it is a number and indicates how fast (or slow) one travels at any given time.

Velocity is a vector quantity, this means that it has magnitude and direction, that is, how fast an object travels and its where its going (speed + the direction in which the object moves).

Acceleration is the ratio of the velocity change over the time interval in which this velocity change occurred. Acceleration as well as velocity is a vector quantity so it is made up of magnitude and direction.

The differences between these three quantities are important for the description of the movement. In the case of speed and velocity, its difference lies in the fact that velocity indicates the direction in which the movement is taking place (and speed is only a number), which in many physical phenomena the direction of movement is an important property. And the difference between acceleration and velocity is that acceleration instead of a velocity indicates a change in velocity (either in magnitude, direction or both), which tells us how fast a velocity will increase or decrease over time.

To calculate the recombination frequency, we need to determine the number of recombinant progeny (ab/ab) divided by the total number of progeny. Therefore, the recombination frequency in this case is 100%.

Given:

Number of progeny with ab/ab genotype = 72 + 68 + 17 + 21 = 178

Total number of progeny = 72 + 68 + 17 + 21 = 178

Recombination frequency = (Number of recombinant progeny / Total number of progeny) × 100%

Recombination frequency = (178 / 178) × 100%

Recombination frequency = 100%

Therefore, the recombination frequency in this case is 100%.

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Answer:

Mars is an opportunity for humans to carry forward the light of consciousness, plus it is the closest planet like earth, it has land humans can land on and although its small, theres still water

Answer:

The answer is: C. the star must be close enough to the Sun to show measurable parallax.

Explanation:

In the field of astronomy, parallax is called stellar parallax in distant stars.

The stars for which parallax measurements have been made are those that are relatively close to the sun on the galactic scale.

The answer is: C. the star must be close enough to the Sun to show measurable parallax.

Answer:

because each row increases in atomic mass by a specific number, so anything over five is in the second row.

The ratio of the radius of the aluminum sphere to the radius of the lead sphere can be represented as:

\(\displaystyle \frac{r_{Al}}{r_{Pb}} =\sqrt[3]{\frac{\rho_{Pb}}{\rho_{Al}} }\)

The density of a material can be measured as the mass per unit volume of the material. The average density equals the mass divided by its total volume.

The mathematical formula for the density can be expressed as follows:

Density = Mass/Volume

The S.I. unit of the density that is used to measure is Kg/m³. If the size increases, the mass increases as well but the density remains constant.

Given the mass of the Al = mass pf the Pb

The ratio density of the Al and Pb can be represented as:

\(\displaystyle \frac{\rho_{Al}}{\rho_{Pb}} } = \frac{m/4\pi r_{Al}^3}{m/4\pi r_{Pb}^3}\)

\(\displaystyle \frac{\rho_{Al}}{\rho_{Pb}} } = \frac{ r_{Pb}^3}{r_{Al}^3}\)

\(\displaystyle \frac{r_{Al}}{r_{Pb}} =\sqrt[3]{\frac{\rho_{Pb}}{\rho_{Al}} }\)

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Answer: The answer is (D) \(v_{f} = 0\)

Explanation: Here is a guide to the symbols that are presented in the options:

In option (A), it is Δx = 0, it is read as "del of x equals zero." Δx represents the change in the position of a particular object.

In option (B), it is \(v_{i}\) = 0, here \(v\) denotes the velocity of the object, and 'i' denotes the initial. So,  \(v_{i}\) denotes the initial velocity of the object.

In option (C), it is a = a, and 'a' denotes the acceleration of the object.

In option (B), it is \(v_{f}\) = 0, here \(v\) denotes the velocity of the object, and 'f' denotes the final. So,  \(v_{f}\) denotes the final velocity of the object.

The question asked about the meaning of "comes to a stop." When an object comes to a stop it means it has no or 0 velocity, which means the final velocity becomes 0. hence, option (D) is the correct answer.

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Answer:

100.390407

Explanation:

To find acceleration, you would use the formula a=f/m (acceleration equals force divided by mass) and then once you enter those numbers in the formula, a=180/1.793. Then you divide 180 divided by 1.793 which gets you an answer of 100.390407.

Answer:

I think it’s 24

Explanation:

Answer:

C. She can increase the number of wire loops.

Explanation:

The more wire loops the more energy.

For a coil of wire, the magnetic field strength is increased by increasing the number of coils around the nail.

An electromagnet is a soft metal core shaped into a magnet by the passing the electric current through a coil surrounding it.

The end of the wire leading to the S is attached to the positive terminal of a battery. The end of the wire leading to the N is attached to the negative terminal of the battery. The current begins to flow. Current cant be changed to increase magnetic field strength, but the no of coils will definitely increase it.

Thus, To increase the strength of the electromagnet, Lisa can increase the number of wire loops.

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cut the square and make it a triangle

Answer:

Gravitational force

Explanation:

Gravitational force is what is making the feather go down. It's pushing the feather down, without the Gravitational force, the feather would have been going up, and not down. Just like us. Gravitational force is what keeps us humans from floating ( unless ur an alien jklol), So yeah Gravitational force is the force that acts upon the feather to fall towards the ground at a constant speed.

Btw, u never listed the forces here just ....

Hope this helped!

A feather is falling towards the ground at a constant speed. Forces act upon the feather is gravitational force.

What is force?

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

When body is falling the net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity  

A feather is falling towards the ground at a constant speed. Forces act upon the feather is gravitational force.

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The time taken for the APUSH textbook to hit the ground is determined as 0.55 seconds.

The time of motion of an object is the time taken for the object to travel from its initial point to the final point.

The time taken for the APUSH textbook to hit the ground is calculated as follows;

t = √(2h/g)

where;

t = √(2 x 1.5/9.8)

t = 0.55 seconds

Thus, the time taken for the APUSH textbook to hit the ground is determined as 0.55 seconds.

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Answer:

The time taken for the train to cross the bridge is 9.01 s

Explanation:

Given;

length of the train, L₁ = 90 m

length of the bridge, L₂ = 0.06 m

speed of the train, v = 10 m/s

Total distance to be traveled, = L₁ + L₂

                                                  = 90 m + 0.06 m

                                                   = 90.06 m

Time of motion = Distance / speed

Time of motion = 90.06 / 10

Time of motion = 9.006 s ≅ 9.01 s

Therefore, the time taken for the train to cross the bridge is 9.01 s

The archerfish must spit the water at 7.3 m/s in order for it to reach the insect, which is at the highest point of the trajectory of the spit water.

The horizontal range is given as:

\(R = V^2sin 2\theta / g\)

Hence, in order to hit the target at a height of 2m, the range of the water spit should be equal to the horizontal distance between the fish and the target. Since the target is 2m above the surface of the water, the horizontal range can be calculated using the formula as shown below;

Range, \(R = (x^2 + H^2)^{1/2}\) Where H = 2m and θ = 60°

Also, the horizontal aiming can be calculated as;

\(h = V^2sin^2 \theta / 2g\) ...where, V = velocity of the spit water and θ = 60°

Now, to find the required speed of the water spit, we can equate R and h as shown below:

\(V^2sin^260 / 2g = V^2sin 2\theta / g\)

Substituting values, we get; V = 7.3m/s

Therefore, the required speed of the water spit is 7.3 m/s, which is answer option B).

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The gravitational field on planet y is one-third that on planet x.

A gravitational field is athe rgion around a mass where the effect of its gravitational force is felt.

Since planet x has a mass of m and a radius of r. planet y has a mass of 3m and a radius of 3r. identical satellites orbit both planets at a distance r above their surfaces. To find how their gravitational fields compare, we find the magnitude of their gravitational acceleration g

The gravitational acceleration is given by g = GM/R² where

For planet x, we have that

So, substituting the values of the variables into the equation, its gravitational acceleration is gx = GM/R²

gx = Gm/r²

For planet y, we have that

So, substituting the values of the variables into the equation, its gravitational acceleration is g = GM/R²

= G(3m)/(3r)²

= 3Gm/9r²

= Gm/3r²

Since gx = Gm/r², we have that

gy = Gm/3r²

= (Gm/r²)/3

= gx/3

So, the gravitational field on planet y is one-third that on planet x.

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B) energy. An important underlying feature of hydraulic devices is the conservation of energy.

This is achieved through the transfer of energy from one point to another using a pressurized fluid, usually oil or water. The fluid is used to transmit force, and the conservation of energy ensures that the force applied at one end of the system is transferred to the other end without any loss of energy. This makes hydraulic devices highly efficient and effective for a wide range of applications, from construction machinery to aerospace engineering. Liquid fluid power is used by hydraulic machines to do operations. Heavy-duty construction vehicles are a typical illustration. Hydraulic fluid is pumped to numerous hydraulic motors and hydraulic cylinders located all around the machine in this type of machine and is pressurised in accordance with the resistance present.

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Answer:

"1155 N" is the appropriate solution.

Explanation:

Given:

Acceleration,

\(a=3 \ m/s^2\)

Forces resisting motion,

\(F_f=432 \ N\)

Mass,

\(m = 241 \ kg\)

By using Newton's second law, we get

⇒ \(F-F_f=ma\)

Or,

⇒         \(F=ma+F_f\)

By putting the values, we get

⇒             \(=(3\times 241)+432\)

⇒             \(=723+432\)

⇒             \(=1155 \ N\)

RC circuit determines the capacitor's charging rate.

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Answer: liquids take the shape of the container they are in, but have definite volume. like liquids the shape of a gas changes with the container. unlike liquids the volume of a gas changes depending on the container it is in

Explanation:

Answer:

liquids flow freely, they take the shape of the container they are in, but have a definite volume. Like liquids, the shape of a gas changes with the container. This is because the atoms in a gas move rapidly and freely to fill any available space. Unlike liquids, the volume of a gas changes depending on the container it

Explanation

answer:

the first one  

Explanation:

i think it is this one because 4k is bigger than 2k . also it is asking which one has the lager magnitude so it is the first one

Answer:

There are several ways to consider the composition of the human body, including the elements, type of molecule, or type of cells. Most of the human body is made up of water and H2O, with bone cells being comprised of 31% water and the lungs 83%.1  Therefore, it isn't surprising that most of the human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 96.2% of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen, and nitrogen.

Explanation:

Elements are essential units that are the basic constituents of all living and non-living beings. They are the core of the universe. Every tiny or huge particle comprises elements. Our body is built up of five major elements: Carbon, Hydrogen, Oxygen, Nitrogen and calcium.

Resonant standing waves are excited on a string that is fixed at both ends. The speeds of the superposed traveling waves that yield the standing wave increase if: "The tension of the string is increased" (Option B)

A resonant mode of an extended vibrating object is commonly referred to as a standing wave.

The resonance is caused by the constructive interference of two waves traveling in opposing directions across the medium, yet the visual result is that the entire system is moving in simple harmonic motion.

With regard to the above response, note that

The speed of a wave is given as:

σ = √ t/μ

Where

μ= mass' density

t = tension

σ = speed

Given the above expression, it is easy to see that when T increases, the speed of the waves increases.

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Answer:

Travels through solid materials, and air.... but it can also travel through the vacuum of space

Explanation:

The final speeds of the spheres are 3.47 m/s and 3.08 m/s.

We can use conservation of momentum to solve this problem since there are no external forces acting on the system.

The initial momentum of the system is:

p_initial = m₁ * v₁ + m₂ * v₂

where m₁ and m₂ are the masses of the spheres, and v₁ and v₂ are their initial velocities (4.00 m/s and 0 m/s, respectively).

After the collision, the momentum of the system is:

p_final = m₁ * v1' + m₂ * v₂'

where v₁' and v₂' are the final velocities of the spheres. We also know that the angle between the first sphere's final path and its initial path is 60 degrees, which means that the angle between the two spheres after the collision is 150 degrees (90 + 60).

Using conservation of momentum, we can set the initial and final momenta equal to each other:

m₁ * v₁ + m₂ * v₂ = m₁ * v₁' + m₂ * v₂'

We can also break down the final velocities into their x and y components using trigonometry. Let's define the angle between the first sphere's final path and the x-axis as theta. Now we can use conservation of momentum to solve for the final velocities:

m₁ * v₁ + m₂ * v₂ = m₁ * v₁' * cos(theta) + m₂ * v₂' * cos(150 degrees)

0 = m₁ * v₁' * sin(theta) + m₂ * v₂' * sin(150 degrees)

Solving the first equation for v₂', we get:

v₂' = (m₁ * v₁ + m₂ * v₂ - m₁ * v₁' * cos(theta)) / (m₂ * cos(150 degrees))

Substituting this expression into the second equation and solving for v₁', we get:

v₁' = (m₂ * sin(150 degrees) * v₁ + m₂ * sin(150 degrees) * v₂ + m₁ * sin(theta) * v₁' - m₁ * sin(theta) * m₂ * v₁ * cos(theta) / cos(150 degrees)) / (m₁ * sin(theta))

Plugging in the given values and solving, we get:

v₁' = 3.47 m/s

v₂' = 3.08 m/s

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Answer:

a weak interaction between particles the result from mass

The possible energy of the emitted photons of the hydrogen atom in first energy level is -3.41 eV.

Hydrogen atom will emit electrons of certain energy when the hydrogen atom is in excited state.

Let a dot represent first energy level, the possible energy of the emitted photons is calculated as follows;

\(E = \frac{R_h}{n^2} \\\\E = \frac{-2.18 \times 10^{-18}}{(2)^2} \\\\E = - 5.45 \times 10^{-19} \ J\)

\(E = \frac{-5.45 \times 10^{-19}}{1.6 \times 10^{-19}} \\\\E = -3.41 \ eV\)

Thus, the possible energy of the emitted photons of the hydrogen atom in first energy level is -3.41 eV.

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