I want to know anwser

Mark's work decreases when he climbs the same flight of stairs again in the same amount of time without the cello.

The correct answer is option D.

The amount of work Mark does depends on the weight of the cello, as well as the distance he climbs and the time it takes. Work is calculated using the formula :

Work = Force × Distance.
In the given scenario, Mark is carrying a full-sized cello while climbing the stairs. The weight of the cello adds to the force he exerts. So, the total force Mark exerts is the weight of the cello plus his own weight (375 N).

When Mark climbs the stairs with the cello, he is doing work against the force of gravity.

The work done is equal to the force exerted multiplied by the distance climbed (375 N + weight of cello) × 4 m.

Now, if Mark were to climb the same flight of stairs again in the same amount of time (3 seconds), but this time without the cello, the amount of work he does would decrease. This is because without the cello, the force exerted would only be Mark's weight (375 N), which is less than the total force exerted with the cello.

Therefore, mark's work decreases.

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Answer:

For \(a > 0\), at \(t = a \; \text{second}\), the particle should have a velocity of \(\displaystyle -\frac{8}{a^3}\; \rm m \cdot s^{-1}\).

Explanation:

Differentiate the displacement of an object (with respect to time) to find the object's velocity.

Note that the in this question, the expression for displacement is undefined (and not differentiable) when \(t\) is equal to zero. For \(t > 0\):

\(\begin{aligned}v &= \frac{\rm d}{{\rm d}t}\, [s] = \frac{\rm d}{{\rm d}t}\, \left[\frac{4}{t^2}\right] \\ &= \frac{\rm d}{{\rm d}t}\, \left[4\, t^{-2}\right] = 4\, \left((-2)\, t^{-3}\right) = -8\, t^{-3} =-\frac{8}{t^3}\end{aligned}\).

This expression can then be evaluated at \(t = 1\), \(t = 2\), and \(t = 3\) to obtain the required results.

If v is the truck's final velocity, then

v² - (2.0 m/s)² = 2 * (2.00 m/s²) * (400.0 m)

v² = 1604 m²/s²

v = 40.05 m/s ≈ 40 m/s

Answer:

The electric potential is the amount of work energy needed to move a unit of electric charge from a reference point to the specific point in an electric field with negligible acceleration of the test charge to avoid producing kinetic energy or radiation by test charge.

SI unit: volt

Other units: statvolt

In SI base units: V = kg⋅m^2⋅A^−1⋅s^−3

Dimension: M L^2 T^−3 I^−1

Explanation:

Hope it is helpful....

Explanation:

common symbol - V

SI unit - volt

other unit - statvolt

Here are five potential-kinetic energy conversions that could be shown in the construction of a device: Pendulum, Roller Coaster, Wind-up Toy, Elastic Slingshot, Windmill.

Pendulum: A pendulum consists of a weight attached to a string or rod, suspended from a fixed point. When the weight is lifted to a certain height, it possesses gravitational potential energy.

As the weight is released, it swings back and forth, converting the potential energy into kinetic energy. At the highest point of each swing, the weight briefly comes to a stop and has maximum potential energy, which is then converted back to kinetic energy as it swings downward.

Roller Coaster: In a roller coaster, potential-kinetic energy conversions occur throughout the ride. When the coaster is pulled up to the top of the first hill, it gains gravitational potential energy.

As the coaster descends, the potential energy is converted into kinetic energy, resulting in a thrilling and high-speed ride. Subsequent hills and loops continue to convert potential energy into kinetic energy and vice versa as the coaster moves along the track.

Wind-up Toy: Wind-up toys typically have a spring mechanism inside. When the toy is wound up, potential energy is stored in the wound-up spring. As the spring unwinds, it transfers its potential energy into kinetic energy, causing the toy to move or perform actions. The kinetic energy gradually decreases as the spring fully unwinds.

Elastic Slingshot: With an elastic slingshot, potential-kinetic energy conversions are evident when the slingshot is stretched. As the user pulls back on the elastic band, potential energy is stored.

Windmill: Windmills harness the kinetic energy of the wind and convert it into other forms of energy. As the wind blows, it imparts kinetic energy to the blades of the windmill. The rotating blades then transfer this kinetic energy into mechanical energy, which can be used for various purposes such as grinding grains or generating electricity.

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Using Newtons Second Law:

F = m×a

F = (0.25 kg)(-2 m/s²)

F = -0.5 N

Answer:

920000

Explanation:

Each kg contains 1,000 grams

The force that is required is 8.88 * 10^6 N

We know that the force that would be required to  winch the ship into the water is the net force that acts on the ship. We have to convert the mass of the ship from ton to kilogram as follows;

Given that;

1000Kg = 1 ton

x Kg = 5000ton

x = 1000Kg * 5000ton/1 ton

x = 5 * 10^6 kg

The force that is required is obtained from;

F = 0.18 *  5 * 10^6 kg * 10m/s^2 * cos 10

F = 8.88 * 10^6 N

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Answer:

Explanation:

The potential energy of a body can be found by using the formula

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 45 × 10 × 2

We have the final answer as

Hope this helps you

Answer:

882 J

Explanation:

Answer: D. Mechanical waves

Explanation: Waves that require matter to travel through are called mechanical waves.  These waves propagate by transferring energy through a medium, which can be a solid, liquid, or gas.  The particles of the medium oscillate or vibrate as the wave passes through them, carrying the energy from one location to another.

Examples of mechanical waves include:

Sound waves: Sound waves are produced by vibrating objects, such as vocal cords or musical instruments.  They require a medium, such as air, water, or solids, to propagate.  When sound waves travel through a medium, they cause the particles in the medium to vibrate, transmitting the sound energy.

Water waves: Water waves are generated by disturbances on the surface of a body of water, such as wind or an object being dropped into the water. These waves travel through the water, causing the particles to move in a circular motion as the wave passes.

Seismic waves: Seismic waves are produced by earthquakes or other geological activities. They travel through the Earth's interior, requiring solid material to propagate. Seismic waves can be further categorized into compressional (P) waves and transverse (S) waves.

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The magnitude of the force P provided that the stress in the part AB is two times that of BC part is 0.8 kN.

The magnitude of the force P provided that the stress in the part AB is two times that of BC part is calculated as follows;

Take moment about the joint to determine the magnitude of the force along part BC.

120 kN x 750 mm  =  F x 1000 mm

F = ( 120 kN x 750 mm ) / ( 1000 mm )

F = 90 kN

Stress is given as force divided by area. The following equation can be used to determine the magnitude of force P.

Stress in AB = 2 times stress in BC

P/A₁  = 2F/A₂

where;

A₁ =  πd²/4  =  π(50 x 10⁻³)²/4

A₁ = 1.96 x 10⁻⁵ m²

A₂ = πd²/4  =  π(75 x 10⁻³)²/4

A₂ = 4.42 x 10⁻³ m²

P/A₁ = 2F/A₂

P = (2F x A₁) / (A₂)

P = (2 x 90 kN x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = (2 x 90,000 N x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = 798.2 N

P = 0.798 kN

P ≈ 0.8 kN

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Answer: B. DLC

B. Visual Updates

B. Competition and expectations

D. Every three months

D. Game expansion packs

C. Visual updates

A. Game expansion

C. Concept art books

A. Create DLC

A. Check licensing agreements

D. Separate her personal finances from the business finances

B. Soundtrack

C. Group dynamics

C. To open a business bank account

B. Onboarding activities

Explanation: :)

Answer:

D. They are all heat insulators.

Explanation:

Those things mentioned above are examples of heat insulators. As a heat insulator, it helps to prevent the heat from leaving the body thereby keeping the body warm and risk free.Feathers in birds and overcoat in humans helps to keep the bodies of the wearer safe and warm during the cold season.

Answer:

B. Convection

D. Conduction

Explanation:

Conduction and convection are the two most prominent processes that helps transfer energy outward to the earth's crust.

Answer:

B and D

Explanation:

I just did it on a p e x. In case your not sure

hydrogen

Atomic fusion occurs when 2 or more atoms combine to create a new element.

Helium

Before figuring out what elements create helium, we need to understand its properties. Helium is the second element on the periodic table. It has 2 protons and usually 2 electrons in the base state.

There are technically ions but base helium will have 2 electrons, especially because it is a noble gas.

Fusion

In most cases, including this one, when 2 atoms fuse together you can add their protons together to find the atomic number of the new element. Since helium only has 2 protons, the elements fused to form helium must both have 1 proton.

The element with 1 proton is hydrogen. So, 2 hydrogen atoms fuse to form helium.

Real World Applications

Fusion can be seen across the universe. One of the most common examples of hydrogen fusing to become helium is in stars. Due to the heat within stars, 2 hydrogen atoms can fuse together to create helium. This process also creates energy in the form of heat and light that the star is made of.

Answer:

v = 349.23 m/s

Explanation:

It is required to find the orbital speed for a satellite \(3.5\times 10^8\ m\) from the center of mass.

Mass of Mars, \(M=6.4\times 10^{23}\ kg\)

The orbital speed for a satellite is given by the formula as follows :

\(v=\sqrt{\dfrac{GM}{r}} \\\\v=\sqrt{\dfrac{6.67\times 10^{-11}\times 6.4\times 10^{23}}{3.5\times 10^8}} \\\\v=349.23\ m/s\)

So, the orbital speed for a satellite is 349.23 m/s.

Answer:

The appropriate solution is "0.597 mm".

Explanation:

Given that:

Wavelength,

\(\lambda = 519 \ nm\)

or,

  \(=519\times 10^{-9}\)

Distance,

\(D=4.6 \ m\)

Separated by,

\(\beta = 4.0 \ mm\)

or,

   \(=4.0\times 10^{-3}\)

As we know,

⇒ \(\beta=\frac{\lambda D}{d}\)

or,

The separation of two slits will be:

⇒ \(d=\frac{\lambda D}{\beta}\)

By putting the values, we get

       \(=\frac{(519\times 10^{-9})(4.6)}{4.0\times 10^{-3}}\)

       \(=5.97\times 10^{-4}\)

or,

       \(=0.597 \ mm\)

Answer:

2 hours

Explanation:

The motorcycle travels 40 km per hour.

80km / 40km/h = 2 hours.

Answer

2 hours

Explanation:

i took it

The car will travel only distance of 25.92 m.In order to overtake it needs to travel 40m. So don't attempt to pass the truck.

Vehicle speed is 25 m/s.

40m is the distance the automobile must go to pass the truck.Distance between the car approaching from the opposite direction and the passing location is 400-40, or 360 meters.

Time allowed for a car to pass a truck of 20 meters in length is equal to the distance between the automobile coming from the other direction and the relative speed of the two cars.

Time equals 360/50, or 7.2 seconds.

Let's assume that the truck is going at the same rate as the car.

The expression "distance traveled by car in comparison to truck"

S is the distance traveled, u is the initial velocity, an is the acceleration, and t is the amount of time spent, where S = ut +\(\frac{1}{2}at^{2}\)

Here, u = 0, t = 7.2 s, and a = 1 m/\(s^{2}\)

hence, the distance driven in 7.2 seconds

So,     S = 0+ 25.92 = 25.92 m

So car will travel only travel 25.92 m

In order to overtake it needs to travel 40m. So don't attempt to pass the truck.

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Answer:

Explanation:

Sure, I'd be happy to help you with the question!

Let's denote the input as x. According to the function machine, the input is multiplied by 6 and then 80 is subtracted from the result to obtain the output.

So, the function can be written as:

Output = (6 * x) - 80

Now, the problem states that the input is the same as the output. Therefore, we can set up the equation:

x = (6 * x) - 80

Let's solve this equation to find the value of x:

x = 6x - 80

Subtracting 6x from both sides, we get:

x - 6x = -80

Combining like terms, we have:

-5x = -80

Dividing both sides by -5, we find:

x = (-80) / (-5)

Simplifying the expression, we have:

x = 16

Therefore, the input (x) that results in the input being the same as the output is 16.

To work out these types of questions, it's important to carefully read the instructions and understand the operations being performed in the function machine. Then, you can set up an equation with the input and output, and solve for the unknown value. Always double-check your solution to ensure it satisfies the given conditions of the problem.

Answer:

16

Explanation:

(x*6) - 80 = x

Multiply the parentheses

6x - 80 = x
Add 80 to each side to get
6x = x + 80
Subtract x from both sides to get
5x = 80
Divide both sides by 5
x = 16

Answer:

\((a)\ F_{No} = [P_{No} - \frac{P_{area}}{2}]* A\)

\((b)\ F_{No} = 771.125N\)

Explanation:

Given

\(d_D = 6000ft\) ---- Altitude of container in Denver

\(A = 0.0155m^2\) -- Surface Area of the container lid

\(P_D = 79000Pa\) --- Air pressure in Denver

\(P_{No} = 100250Pa\) --- Air pressure in New Orleans

See comment for complete question

Solving (a): The expression for \(F_{No\)

Force is calculated as:

\(F = \triangle P * A\)

The force in New Orleans is:

\(F_{No} = \triangle P * A\)

Since the inside pressure is half the pressure at sea level, then:

\(\triangle P = P_{No} - \frac{P_{area}}{2}\)

Where

\(P_{area} = 101000Pa\) --- Standard Pressure

Recall that:

\(F_{No} = \triangle P * A\)

This gives:

\(F_{No} = [P_{No} - \frac{P_{area}}{2}]* A\)

Solving (b): The value of \(F_{No\)

In (a), we have:

\(F_{No} = [P_{No} - \frac{P_{area}}{2}]* A\)

Where

\(A = 0.0155m^2\)

\(P_{No} = 100250Pa\)

\(P_{area} = 101000Pa\)

So, we have:

\(F_{No} = [100250 - \frac{101000}{2}] * 0.0155\)

\(F_{No} = [100250 - 50500] * 0.0155\)

\(F_{No} = 49750* 0.0155\)

\(F_{No} = 771.125N\)

a) The average force with which the woman pushed the man is 210 N.

b.  the woman's recoil speed is still 3.68 m/s

c.  If  she now throws her 2.50-kg purse at him at a 20.0° angle, the speed is 0.

We first calculate  the Momentum  = (70.0 kg)(-1.50 m/s) + (55.0 kg)(v) + (2.50 kg)(-1.50 m/s)

0 = (70.0 kg)(0 m/s) + (55.0 kg)(v) + (2.50 kg)(-1.50 m/s) - (70.0 kg)(-1.50 m/s)

v = 3.68 m/s

Δp = (70.0 kg)(1.50 m/s) - (70.0 kg)(0 m/s) = 105 kg·m/s

The average force exerted on the man by the woman is:

Average force =   Δp / Δt

Average force  = 105 kg·m/s / 0.500 s

Average force  = 210 N

b) The woman's recoil speed is :

0 = (70.0 kg)(-1.50 m/s) + (55.0 kg)(v) + (2.50 kg)(-1.50 m/s)

v = 3.68 m/s

c) If the woman throws her 2.50-kg purse at the man at a 20.0° angle, we apply the conservation of momentum equation in two dimensions and get the speed as 0.

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Answer:

last one. c

Explanation:

atomic number; number of neutrons = mass number - atomic number​ is the very important to find the number of the question.

Answer:

Stars are the light bulbs of the universe.

Answer:

Stars are the recycling centers of the universe

Explanation:

I just did on edge C

Answer:

v = 0.1068 m / s

Explanation:

To find the speed of the satellite we use Newton's second law where the force is the universal law of gravitation

            F = ma

            F = \(G \frac{m M}{r^2}\)

acceleration is centripetal

            a = v² / r

we substitute

            \(G \frac{m M}{r^2} = m \frac{v^2}{r}\)

             v² = \(G \frac{M}{r}\)

The radius of the orbit is given we will assume that this radius is half from the center of the earth

we substitute

            v² = 6.67 10⁻¹¹ 5.98 10²⁴/6758998

            v = \(\sqrt{59.013 \ 10^6}\)

            v = 7.68 10³ m / s

The centripetal acceleration is

            a = v² / r

            a = 7.68 10³/6758998

            a = 1.14 10⁻³ m / s²

For the airplane we use the definition of centripetal acceleration

            a = v² / r

            v = \(\sqrt{a \ r }\)

let's calculate

            v = \(\sqrt{1.14 \ 10^{-3} \ 10}\)

            v = 0.1068 m / s

When the teacher asked the student to make words out of the jumbled word gzeysktqix, the student was being tested on his ability to unscramble words. Unscrambling words is the process of taking a word or series of letters that are out of order and rearranging them to form a word that makes sense.

When trying to unscramble a word, it is important to look for any patterns that can help identify smaller words within the jumbled letters. This can help make the process easier and quicker. For example, in the jumbled word gzeysktqix, one might notice that the letters "sktqix" appear together.

This could indicate that these letters could potentially form a word. By looking at the remaining letters, one could notice that the letters "g", "z", "e", and "y" could also form smaller words. After some rearranging, the letters can be unscrambled to form the words "sky", "zig", "sex", and "yet". These are just a few examples, as there are likely many other words that can be formed from this jumbled word.

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Answer:

4.3 g/cm³ or 4.3g/cc

Explanation:

Volume(V) = Height × Length × Width

= 5cm × 3cm × 2cm

= 30cm³

Mass(m) = 129gram

So,

Density = m/V

= 129g/30cm³

= 4.3g/cc or 4.3g/cm³