Marking brailiest: Two Speed and velocity questions below

A car travels a distance of 100 km in 2 hours. What is the average speed of the car (km/h)?

An NFL wide receiver prospect runs 40 m in 4.5 seconds. What is the average speed of the wide receiver (m/s)?

The speed of an object is the distance traveled in unit time, while acceleration of an object is the rate of change of velocity in respect to time

Answer:

Carbon is the cornerstone of most biologically produced organic compounds such as proteins, carbohydrates, fats and DNA. All of these compounds contain, in addition to carbon, many other elements, including hydrogen, nitrogen and oxygen.

Explanation:

The kinetic energy of another body having three times the mass of the given object will be 108 J

Kinetic energy-In physics, the kinetic energy of an object is the energy  it has due to  motion. It is defined as the work required to accelerate a body from a given mass from rest to a specified speed.

The kinetic energy of a body is given by \(K.E= \frac{1}{2}Mv^{2}\) (first equation)

Given K.E= 36J

Now the mass of second body is m=3M

also the second body is moving with the same speed v

So kinetic energy of second body K.E₂= \(\frac{1}{2}mv^{2} =\frac{1}{2}(3M)v^{2}\)=36×3

=108J (from first equation)

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Answer:

The heat causes the molecules on rubbing surfaces to move faster and have more energy.

The effective spring constant of the musculature attached to the eyeball is 252 N/m as spring consequently in the recipe the mass of the eyeball ought to be subbed to track down the spring constant of the muscle.

The idea expected to take care of this issue is that when two bodies are in reverberation then it implies that they have same recurrence.

In order to determine the resonating system's spring constant, first create the formula for the spring mass system frequency and then substitute the eyeball's mass and frequency.

If the vibrational frequency of two bodies is the same, they are said to be in resonance.

Recurrence for spring mass framework:

                                    f = \(\frac{1}{2} \sqrt{\frac{k}{m} }\)

f is the recurrence of the spring mass framework, m is the mass of the connected body, and k is the spring constant of the body.

The normal recurrence of the eyeball is 29 Hz. Because the head and the eye have the same natural frequency, they are in resonance, and the image seen is blurry.

The eyeball has a frequency of 29 Hz if we consider the eyeball and muscle to be a spring mass system.

The frequency at which a system cannot vibrate is known as the natural frequency. The system's natural frequency or one of its harmonics should be used to vibrate it.

                                      \(f = \frac{1}{2\pi } \sqrt{\frac{k_{m} }{m_{c} } }\)

                                 \(\sqrt{\frac{k_{m} }{m_{c} } } = 2\pi f\)

 km = 4π²f²\(m_{e}\)

                                 km = 4π²(29Hz)²( 7.6 g)

                                 =      4π²( 29Hz)²7.6 g /1000g × 1 kg

                                          =    4π²( 29Hz)²7.6 × 10⁻³ kg

                                            = 252 N/m

Here the body which is vibrating is eyeball and the muscle is going about as spring consequently in the recipe the mass of the eyeball ought to be subbed to track down the spring constant of the muscle.

Incomplete question :

Vision is blurred if the head is vibrated at 29 {\rm Hz} because the vibrations are resonant with the natural frequency of the eyeball held by the musculature in its socket.

If the mass of the eyeball is 7.5 {\rm g}, a typical value, what is the effective spring constant of the musculature attached to the eyeball?

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Answer:

Atom has become a cation.

Atom has lost 2 electrons.

Explanation:

Based on the ionic notation of the element or ion given, we can clearly state that the atom has become a cation and it has lost two electrons.

A cation is an atom that has lost electrons to become positively charged.

In a neutral atom, the number of protons and electrons are the same.

Protons are the positively charged particles within an atom.

Electrons are the negatively charged particles.

 When an atom loses electrons, it becomes positively charged because the number of electrons is now more.

Positively charged atoms are called cations.

Answer:

Periodic motion, in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.

Explanation:

The percentage of time the operator of the single entrance booth will be free is approximately 38.462%.

To determine the percentage of time that the operator of the single entrance booth will be free, we need to calculate the service rate and the arrival rate. The service rate is given as 400 vehicles per hour, and the arrival rate is 250 vehicles per hour. The percentage of time the operator will be free can be calculated using the formula:

Free time percentage = (Service rate - Arrival rate) / Service rate * 100

Substituting the given values into the formula:

Free time percentage = (400 - 250) / 400 * 100

= 150 / 400 * 100

= 0.375 * 100

= 37.5%

Rounding off the answer to the nearest thousandths, the percentage of time the operator of the single entrance booth will be free is approximately 38.462%.

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Answer:

Atoms are so much smaller than the wavelength of visible light that the two don't really interact.

Explanation:

To put it another way, atoms are invisible to light itself.

Visible light has a wavelength that ranges from 400 to 700 nm. Atoms, in contrast, typically have a diameter of between 0.1 and 0.3 nm. The size difference is greater than a thousand times, even with straightforward calculations.

Over 500,000 times of magnification are possible using an electron microscope, which is sufficient to observe a great deal of information inside cells.

The electron microscope comes in a variety of varieties. Atoms and nanoparticles can be observed with the use of a transmission electron microscope.

In a chemical reaction, atoms cannot be formed or destroyed, since they are indivisible units. The mass and chemical characteristics of each atom of a specific element are the same.

Therefore, the atom's structure is invisible to visible light.

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Answer:

720N

Explanation:

force=mass × acceleration

=ma

= 1200×0.6

=720

the s.i unit of force is Newtown therefore the answer is 720N

In order for the lighthouse beacon to produce a parallel beam of light, the light source should be placed at the focal point of the converging lens.

When light from the source enters the lens, it will refract and converge to a point at the focal point of the lens. If the light source is placed at this point, the light rays will exit the lens in a parallel direction, producing a parallel beam of light.

It's worth noting that the exact placement of the light source may depend on the specific design of the lighthouse beacon and the properties of the lens being used. But in general, the light source should be positioned at the focal point of the converging lens to produce a parallel beam of light.

What is light ray?

A light ray is a hypothetical straight line that represents the path of light as it travels through space.

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Answer:

I think the answer is D.)

Explanation:

If it means something needs to melt into liquid i would have gone with B.) or C.) but since it doesn't specifiy. I thought D.) since all you have to do is heat it and it melts or boils.

To determine the tangential speed required to keep the system in equilibrium, the radius of the circular path and the mass of the hanging object must be measured.

The radius of the circular route and the mass of the hanging item must be quantified to calculate the tangential speed necessary to maintain the system in balance. This is due to the strain in the string, which is equivalent in strength to the weight of the suspended object, providing the centripetal force necessary to maintain the object in a circular motion.

Thus, the mass of the suspended item can be used to compute the tension in the string, and the radius of the circular route along with the tension in the string can be used to determine the tangential speed. By ignoring frictional forces, we can concentrate on the centripetal force necessary to maintain the system's balance and simplify the analysis.

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Answer:

the amount of each charge and the distance between them. ... Coulomb's law states the the electric force between two charges is proportional to the product of the two charges and inversally proportional to the square distance that separates their centers.

it will avoid the sun rays from penetrating into the glass to make it hot,and even fall on the seat and burn

Explanation:

Because of the type of metal it was made with

Answer:

The car gets hot in the photograph because of greenhouse effect. Most noticeably the fact that the sunlight enters the car through the windows to heat up the inside surfaces, which then gets trapped inside the car, causing a buildup of temperature.

Sunscreen can help keep the car cool by reflecting the sunlight, which in turn reduces the amount of heat that enters the car. This also decreases the inside surfaces to the exposure of UV lights.

Water is slowly poured into the container until the water level has risen into tubes 1, 2 and 3. The water doesn't overflow from any tubes. We have to compare the water depths in the three columns.

Since the water level has risen into all three tubes, the pressure at the bottom of all three tubes is the same.

The pressure at the bottom of each tube is given by the height of the water column multiplied by the density of the water and the acceleration due to gravity.

Since the density and acceleration due to gravity are the same for all three tubes, the pressure at the bottom of each tube depends only on the height of the water column. Therefore, the water depths in the three columns must be the same, i.e., D1 = D2 = D3.

So, the correct answer is: D1 = D2 = D3.

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The generator power will be 59 kW. Power drop is the main factor for finding the generated power.

The maximum power input allowed to pass through a piece of equipment is known as the equipment's power rating.

Power drop = 5%

The relation of the frequency change with the power drop is;

\(\rm \frac{df}{dp} =5\%\\\\ \frac{f_{rated-f_1}}{P_{rated}-P_1}=0.05\\\\ \frac{f_{rated-60}}{100-61}=0.05\\\\ f_{rated}=61.95\)

For the grid frequency, 59.9 Hz

\(\rm \frac{f_{rated-f_2}}{P_{rated}-P_2}=0.05\)

\(\rm \frac{61.95-f_2}}{100-P_2} =0.05\\\\ 100-P_2 =20(61.95-59.9)\\\\P_2=100-41 \\\\ P_2=59 \ kW\)

Hence, the generator power will be 59 kW.

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If a wave traveling through a rope with a 1 meter distance from one crest to the next, then the wavelength of the wave is 2 meters.

In a wave, the wavelength is defined as the distance between two consecutive points in the same phase of motion, such as two consecutive crests or troughs.

In this case, the distance between two consecutive crests is given as 1 meter. Since one complete wavelength consists of one crest and one trough, the distance between two consecutive crests is actually half of the wavelength. Therefore, the wavelength can be calculated by multiplying the distance between two consecutive crests by 2, resulting in a wavelength of 2 meters.

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The specific heat capacity of the metal is 32427.7 J/kg/°C if the mass of a metal is 50 gm.

The specific heat capacity of a substance is the heat required to increase the temperature of the substance of unit mass by one degree. Its SI unit is J/kg/°C.

Mass of the metal= 50 g= 0.05 kg

Temperature of the metal = 100°C

Mass of the water = 200 g = 0.2 kg

Mass of the calorimeter = 80 g =0.08 kg

Temperature of the calorimeter and water combined= 14°C

Equilibrium temperature = 70°C

Specific heat capacity of the copper = 390 J/kg/°C

Specific heat capacity of the water = 4187 J/kg/°C

Heat lost by the metal = heat absorbed by the water and calorimeter

0.05×S×(100-70) = (0.2×4187+0.08+390) × (70-14)

1.5×S = 48641.6

S= 32427.73 J/Kg/°C

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To solve this problem, we can apply the principle of conservation of angular momentum. According to this principle, the total angular momentum before the collision should be equal to the total angular momentum after the collision. Therefore, the common final angular speed of the system is approximately 12.42 rev/s.

The angular momentum of a rotating object can be calculated using the formula:

L = Iω

The moment of inertia of a disk can be calculated using the formula:

I = (1/2) × m × r²

Let's calculate the initial and final angular momenta of the system.

For the first disk:

m₁ = 3.5 kg (mass of the first disk)

r₁= 15 cm = 0.15 m (radius of the first disk)

ω₁ = 15 rev/s (angular speed of the first disk)

I₁ = (1/2) ₓ m1 ₓ r₁²

For the second disk:

m₂ = 5 kg (mass of the second disk)

r₂ = 9 cm = 0.09 m (radius of the second disk)

ω₂ = ? (angular speed of the second disk)

I₂ = (1/2) ₓ m2 ₓ r₂²

The initial angular momentum of the system (before the collision) is the sum of the angular momenta of the individual disks:

\(L_{initial}\)= I₁ ₓ ω₁ + I₂ ₓ 0 (since the second disk is initially non-rotating)

The final angular momentum of the system (after the collision) is the sum of the angular momenta of the two disks, assuming they rotate with a common final angular speed ω_final:

\(L_{final}\)= I₂ ₓ ω\(_{final}\) + I₂ₓ ω\(_{final}\)

Since the total angular momentum is conserved, we can equate the initial and final angular momenta:

\(L_{initial}\)= \(L_{final}\)

I₁ ₓ ω₁ = (I₁ + I₂) ₓ ω\(_{final}\)

Substituting the values:

(1/2) × m× r₁² × ω₁ = [(1/2) × m₁ × r₁² + (1/2) × m₂ * r₂²] ×  ω\(_{final}\)

Simplifying the equation:

m₁ × r₁² × ω₁ = m₁ × r₁² ×  ω\(_{final}\) + m₂ × r₂² ×  ω\(_{final}\)

ω\(_{final}\) ×  [m₁ × r₁² + m₂ × r₂²] = m₁ * r₁² * ω₁

Finally, solving for  ω\(_{final}\):

ω\(_{final}\) = (m₁ × r₁² × ω₁) / [m₁ × r₁² + m₂ × r₂²]

Plugging in the values:

ω\(_{final}\) = (3.5 kg × (0.15 m)² × 15 rev/s) / (3.5 kg × (0.15 m)² + 5 kg × (0.09 m)²)

Calculating the result:

ω\(_{final}\) =12.42 rev/s

Therefore, the common final angular speed of the system is approximately 12.42 rev/s.

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The density of water is 1.0 g/cm³. It's required to determine the mass of water displaced by a submerged 120-cm³ block and the buoyant force on the block.To find the mass of water displaced by a 120 cm³ block, we first need to know the mass of 1 cm³ of water, which is equal to its density, which is 1.0 g/cm³.

The volume of the block is 120 cm³, so we can calculate its mass by multiplying its volume by the density of water. Therefore, the mass of the block submerged in water is:120 cm³ × 1.0 g/cm³ = 120 gTo find the number of kilograms, we divide the value obtained by 1000. Therefore, 120 g = 0.12 kg.The buoyant force is equal to the weight of the water displaced by the block. The buoyant force equals the weight of water displaced by the object.

The weight of 1 cm³ of water is 9.8 N (newtons), which is equal to the weight of 1 g of water. We can use this to calculate the weight of water displaced by the block as follows:120 cm³ × 1.0 g/cm³ × 9.8 N/g = 1176 NTherefore, the buoyant force acting on the block is 1176 N (Newtons).

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Starting from rest, the wheel accelerates to an angular velocity of

ω = (2.52 rad/s²) (7.03 s) ≈ 17.7 rad/s

then undergoes a new acceleration α until it comes to a rest. It does so in 11.9 revolutions, or with an angular displacement of (11.9 rev) • (2π rad/rev) = 23.8π rad. So α satisfies

0² - ω² = 2 α (23.8π rad)

α = - ω² / (47.6π rad)

α ≈ -2.10 rad/s²

None

because 9 + 5 = 10 why? because 4 of the ones in nine are liars pretending to be apart of the number so in reality there is only 5 and 5+5=10

Answer:

South Carolina and Georgia, the main cash crops were indigo and rice. Explanation:

trust me

Base on the experiment, we can deduce that the working principle of most electric generators is based on spinning a permanent magnet near coils of wounded wire.

Faraday's law of electromagnetism states that the negative rate of change of time (Δt) of the flux of the magnetic field (∅) through a surface is directly proportional to the flux (∅) of the electric field through a surface that has the loop as its boundary.

Electric generators are primarily designed and developed to use the properties of electromagnetism to convert kinetic energy (KE) that is possessed due to motion, into electrical energy. Thus, we can deduce that the mode of operation or working principle of most electric generators is based on spinning a permanent magnet near coils of wounded wire.

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Answer:we can deduce that the working principle of most electric generators is based on spinning a permanent magnet near coils of wounded wire.

Explanation:

Answer:

Because radiation does not require material medium for its propagation.

Explanation:

Radiation is one of the types of modes of heat transfer that takes place majorly in gases. Heat energy can be transferred through gases by radiation without heating up the intervening medium. Even, if the available molecules of gases are evacuated, the heat energy would propagate.

Thus, student's hands were not heated by convection since convection is a mode where material medium is required for propagation of heat energy.

Her hands are not heated by convection ​because radiation does not require material medium for its propagation.

 Radiation

Thus, student's hands were not heated by convection since convection is a mode where material medium is required for propagation of heat energy.

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Answer:

12 miles per second

Explanation:

Answer:

\(\boxed {\boxed {\sf 12 \ m/s}}\)

Explanation:

Speed is equal to distance divided by time.

\(s=\frac{d}{t}\)

The horse ran 1500 meters in 125 seconds.

\(d= 1500 \ m \\s= 125 \ s\)

Substitue the values into the formula.

\(s= \frac{ 1500 \ m }{125 \ s}\)

Divide.

\(s= 12 \ m/s\)

The speed of the race horse is 12 meters per second.

Answer:

transmission: the passing of a wave through an object

Explanation: